UNIVERSITY OF MICHIGAN ANN ARBOR STATUS OF VARIOUS INVESTIGATIONS IN PROGRESS AT THE UNIVERSITY OF MICHIGAN FOR THE NATIONAL ADVISORY COMM.ITTEE FOR AERONAUTICS November 10, 1944 Approved by A. E. White Written by E. E. Reynolds J. W. Freeman Project. Number M478-A November 10, 1944

TABLE OF CONTENTS Page A. Large Disc Forgings of 19-9 DL, 234-A-5, Low Carbon N155 and Discaloy,.................,.. 1 B. 19-9 DL Turbosupercharger Discs at 1200 and 1350~F.............. +................... 15 C. Typical 19-9 DL Bar Stock..,................. 18 D. S816 and S590 at 1350~F......................... 25 E. Modifications of 19-9 DL, Low Carbon N155 and N155 Alloys...........................*.. 30 F. Vacuum Melting............... 36 G. Alloys for Service at 1700 and 1800~F.......... 40 H. Ceramic Coatings......*............*.,. 56 I. Segregations in 234-A-5 Alloy.................. 59 J. Investigations to be Undertaken................. 60

STATUS OF VARIOUS INVESTIGATIONS IN PROGRESS AT THE UNIVERSITY OF MICHIGAN FOR THE NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS November 10, 1944 A. Large Disc Forgings of 19-9 DL. 234-A-5; Low Carbon N155 and Discaloy Rupture test characteristics and time-deformation curves are being determined at 1200 and 1350~F. for several large disc forr.ings. A considerable portion of the data have been obtained on one forging of each type, as summarized in Tables I through VII and Figures 1 through 5. In addition to these forged discs a limited investigation has been started on several Low Carbon N155 discs from the Crucible Steel Company described in Table IA. The purpose of checking these Low Carbon N155 discs is to obtain an indication of the probable variation between heats and between sources, as well as to study the effects of heat treatments. The investigation of the 19-9 DL disc is nearly complete and considerable data are available for the Low Carbon N155 and 234-A-5 discs. Further work on the Discalloy disc has been held uo pending information from Westinghouse concerning this alloy. As decided at the September 21, 1944 meeting of the Special Subcommittee no further work will be undertaken at 1350~F. on 19-9 DL and 234-A-5 alloys beyond the completion of the tests then in progress. The properties of the four discs which have been investisated are compared as follows:

2. 1. Tensile Pronerties Discaloy has outstanding tensile strengths at room temperature and 12000F.; Low Carbon N155 is intermediate, and 19-9 DL and 234-A-5 are quite similar, 2. Rupture Test Properties Low Carbon N155 has the highest strengths at both 1200 and 1350~F. Discaloy has high strength at 1200~F. particularly at the shorter time periods, but has very low elongation and reduction to fracture. The strength of 19-9 DL is somewhat higher than 234-A-5. 3. Time-Deformation Characteristics The data for 19-9 DL are nearly complete, but only partial values are available for 234-A-5 and Low Carbon N155. The Low Carbon N155 is superior to the other two alloys in this test. The results on 234-A-5 indicate that it will also be similar to 19-9 DL in this test. No tests of this nature have yet been started on Discaloy. Figure 3 shows that 19-9 DL in this form cannot carry high loads at 1350~F. when the permissible deformation is limited. The transition curve shows that third stage creep is encountered in less than 2000 hours under a stress of only 5000 pounds per square inch. Note: Three of the creep tests on 19-9 DL and the two tests on Low Carbon N155 at 13500F. were reported by Mr. H. C. Cross from NRC - Project 8 data. 4. Source of Materials 19-9 DL Disc - Heat B-10429, Universal Cyclops Steel Corporation. Supplied to University of Michigan by NRC Project 8 under specimen designation NR46-B. 234-A-5 Disc - Induction Heat 1X2218, Crucible Steel Company of America.

3. Low Carbon N155 Disc - Discaloy Disc Low Carbon N155 Disc - Universal Cyclops Steel Corporation. Supplied to University of Michigan by NRC Project 8 under specimen designation NR-66D. Westinghouse alloy. Supplied to University of Michigan by NRC Project 8 under specimen designation NR-78. Crucible Steel Company of America. Supplied to University of Michigan by NRC Project 8 under specimen designation NR-66E.

Table I CHEMICAL COMPOSITION AND PROCESSING PROCEDURES FOR FOUR FORGED DISCS Chemical Composition Alloy 19-9 DL 234-A-5 Low Carbon iNl15 5 Discaloy C A&n.33 1.44.25, 4.14.15 1.74.10 ---- Si Cr.65 19.10.25 18.32 Ni Co Mo w Ti Cb 2 S P Al _ _ _ _ _ _ 9.05 - 1.35 1.14 5.76 --- 146 151 0.16 0.35 ---.015 --.95 —'.023.016 --.017 --.37 21.66 19.40 19.02 2.76 1.90 --.79.14.021.018 -- -- 13 25 ~ —- -- -. 2.25 --—.6 Processing Procedures 19-9 DL 234-A-5 The disc was made from a billet from 10,000 pound arc furnace Heat No. B10429 by the Universal Cyclops Steel Corporation. The billet was directly up-set. to produce the disc and finished at 16400F. to 19-3/4-inches in diameter by 3-1/4inches in thickness. The finished disc was stress relieved two hours at 1200~F. Induction Heat No. 1X2218 by Crucible Steel Company of America. Forged to 20-1/8inches in diameter by 3-5/16-inches thick. Finishing temperature, 14000F. Stress relieved four hours at 1200~F. Low Carbon Forged to 20-inches in diameter by 3-1/4-inches thick. Finishing temperature, N155 1(,30~F. Stress relieved two hours at 1200~F. Di scaloy Forged to approximately 20-inches diameter by 3-1/4-inches thick. Disc solution heat treated at 1950~F. for one hour and air cooled by air blasts directed at the center of each face. Bars cut from disc were aged 20 hours at 1350~F.

5. Table IA Description of Low Carbon N155 Discs from the Crucible Steel Company 1. 14-3/4-inch x 4-3/8-inch discs were made from Crucible Heat Number 1X2232 which was reported to have the following analysis: C Mn Si Cr Ni Co Mo W Cb N P S.07 1.68.60 20.80 20.60 20.07 2.94 2.67 1.05.125.015.012 2. Three discs were forged-and each was cut in half for final treatment to provide the following representative conditions: As Forged: One-half of disc No. 1. As Forged + Aged at 15000F: One-half of disc No. 1 was heated from the as-forged condition to 1500~F., held 24 hours and then air cooled. Solution Treated + Aged at 1500~F.: Disc No. 2 was heated to 2200~F. and quenched in water. One-half was reheated to 1500~F. and held for 24 hours and then air cooled. Solution Treated + Aged at 13500F.: The other half of disc No. 2 after water quenching from 22000F. was reheated at 1350~F. for 24 hours and air cooled. "Hot-Cold" Worked + Aged at 1500~F.: Disc No. 3 was left about 1/8-inch oversize in the upsetting operation. It was then heated to 2250~F. and water quenched, reheated to 1500~F., held 3 hours and then reduced under the hammer approximately 1/8-inch in thickness (approximately 3% reduction), the finishing temperature being about 1200~F. It was finally "stress-relieved" for 24 hours at 1500~F. 3. Manufacturing Procedure: The discs were made from a one-ton induction heat. One ingot was cast 15-inches square by 2200 pounds. This ingot was heated to 2100-2150~F. and cogged on a 7-ton hammer to a 9-inch square billet. Four reductions and three reheatings were required for this operation. The billet was ground, pickled, chipped and cut into slugs weighing 225 pounds. The slugs were reheated to 2100-2150~F. and upset to discs 14-3/4-inches in diameter x 4-3/8-inches thick on a 2800 pound hammer, the finishing temperature being approximately 15000F.

Table N. COMPARATIVE TENS LE PROPERTIES FOR FORGED DISC, (Radial Specimens| Iso.ee..... Alloy Temp. OF. Tensile Strength Lb./Sq.In. Offset Yield Stress Proportional ~i Lb./Sq.In. Limit 0.02% 0,1 0.2 Lb./SQ.In.,.. Reduction Elongation of Area %.in2 In. Brinell fardness ~I9r —--- Room 103,250 40,600 5-0,500 55,00. -- 3y539oo —3,750( "50,000 55,000 24,000.. 25.0- 23.7 202 2 5 *5" " ~~~- -2^-~"~~~~~~_ -~~ —-2J ti8L.'.. 234-A-5 RsFa Room Low Carbon N155rsvwf Room 354^ DBdstarsfloy^ "Hboin 108,800 106,900 117,600 119,500 37,500 53,000 59,000 22,500 37,500-,50,5-00 56,000-"' 22,500 33.0 35.5 33.8 40.7 48.1 52.2~ 209 204 58,000 67,000 71,500 58,000 69,000 73,500 47,500 45,000 30.0 32.0' 211 211"... i T5U —-76-eTKYO 157.750 77,000 157,750 77,000 97,000 103,000 47,500 22.0., - ~ 2,, K9.291 25.8 -... I9-57 75'V*~'~)~*'urcm~rrrrueut.?4& - --— * 234-A-5 RsF6%j 1200 15,000 17., 500 _...wR~t~i -34.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"~ 51,000 52,750 38,000 37,00O 40,500 39,000 27.0 27.5 53.2 45.8 Low Carbon N155.YiS 1200 kR ^O~~2 83,000 83,000 -USt Q_2 48,000 50,000 47,000 49,000 27,500 25,000 17.0 25.0 33.8 33.4 oi) ctsL.CE 1 9nn 1,`50,....:.~~~~~'- -A I, _ ~ 9,)F0-~ —3^5Q —^-^ —-.~~e,,t&Q-' —-1 ".^^'~-";.-5......''"-'7 1..- ^............., "' t3 5trx~+X zN 9I 0 s 1; -...-!*oly!rlE-5so *s^ f ><t 234-A-5./Psr 1350 A4;V?<'r 39,700 38,500 32,000 34, 32,000 34, 500. 000 15,000 12,500 40.0 40.0 55.7 56.0 5ow Carbon N155 cs p,,J3 1350 h~f f~ l\ -' (/ 59,750 37,500 40,00 20,000 24.0 24.8'*Od i sos ats At a1J902l Orher discs a foea and ees e e ev

7. Table III RUPTURE TEST CHARACTERISTICS OF A 19-9 DL FORGED DISC (Radial Specimens at Edge of 20" Diameter x 31" Thick Disc) Temrperature I 0 ~F. 1200 1350 Stress Lb./Sq. In. 54,000 49,000 40,000 37,500 35,000 33, 500 33,500 36,000 30,000 25,000 22,500 20,000 17,500 14,500 Rupture Time Hours 1.02 4.43 25.0 290.0 966.5 604.5 1565.0 0.68 4.55 36.0 135.0 277.0 663.5 1404.0 Elongation % in 1 In. 32 37 11 39 16 9 15 38 42 31 34 30 24 23 Reduction of Area., 43.7 51 0 25.6 53.6 29 8 28.8 46.5 62.5 70.4 55 3 64.7 67.6 38.0 32.0 Table f: RUPTURE TEST CHARACTERISTICS OF'234-A-5 FORGED DISCS (Radial Specimens1:S of - 20" Diameter.,-,x-..3i."..- Thick Disc) c+ E<A Temperature OF. 1200 1350 Stress Lb./Sq.In. 648,000F 48, 000 45,000 35,000 32,500 30,000 =28,500 32,000 20,000 17,500 15,000 12,500 Rupture Time Elc Hours j I-'l ^ l' i' > t xaz* I gx 1.09 5.0 127.0 196.5 974.0 - v gro9 1224 1.65 71.5 216.0 420.0 1080.0 )ngatic in 1 Ir 28 31 32 19 18.3 38 39 25 15 13.5 )n Reduction Il of Area. 41.8 46.5 48.3 51.9 38.8 50.5 48.3 46.5 22.3 12.2 -s&graed 4A^eoVA' korke d &4ek *. 5 o-v K& Z8O BS/1.9/h7e r-3*qF +/A;<' u t4d U R-\ b kM?; I 2 2. 0O

8. Table V RUPTURE TEST CHARACTERISTICS OF kLOW CARBON N155 FORGED DISCS (Radial Specimens at Edge of 2 Di mter.. DI-m vcybm C&^axo4 a f5CS Temperature Stress Rupture Time Elongation Reduction ~F. Lb./Sq.In. Hours % in 1 In. of Area.'t tJnlterso -Ac/ops fhf ed /./S5c, aP /Qiefe7 X31/' Tek ID6icA 1200 77,000 1.07 9 16.0 72,000 2.35 26 21.8 55,000 94.0 12 10.9 50,000 204.0 10 9.7 45,000 502.5 7 8.5 40,000 1461.0 12 16.7 1350 52,000 45,000 35,000 30,000 25,000 23,000 20,000 25,000 1.05 29 33.0 4.47 12 16.7 36.0 23 33.0 186.0 9 11.5 432.0 10 19.5 1734.0 6.2 1336.0 5 6.0 (Check test in progress 24 hrs, 11-10-44) r Table yI RUPTURE TEST CHARA TERISTIC O' DJSCALOY FORGED DISC (Radial Specimens at.ge of2O" Diameter x 31" Thick Disc) temperature Stress R pture Time Elongation Reductio: 0F.: Lb./Sa.n. ours % in 1 In. of Area. i200 65,000 20.- 1 3.0 48,86 145.0\ 1 2.3 40,.00 750.0 2 0 lCAU Ws P coo IlO60 n 9:

9. Table VII COMPARATIVE RUPTURE STRENGTHS FOR FOUR FORGED DISCS AT 1200 AND 13500F. (Radial Specimens at Edge of 20" Diameter x 3i" Thick Disc) Temp..OF. 1200 Stress, Lb./Sq.In. for Rupture at Indicated Time Periods, Hours 1 10 100 1000 2000 54,000 46,000 40,000 34,000 33,000 19-9 DL 234-A-5 1200 49,000 42,000 35,500 30,000 28,500 Low Carbon N155 1200 Discaloy 19-9 DL 234-A-5 1200 1350 77,000 65,000 55,000 42,000 39,000 ----- 71,00 52,000 39,000 35,000 34,500 28,000 23,000 15,500 13,500 1350 33,500 25,000 19,000 12,500 11,000 Low Carbon N15 5 1350 52,000 40,000 31,000 (24,500)* * *Data incomplete. (1) 19-9DL, 234-A-5, N155 discs as-forged and stress relieved. 2) Discaloy disc solution treated and aged. (3) 19-9 DL data previously presented in Report No. 10. 4) Discaloy data reported by letter on August 7, 1944.

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CONFI DENTIAL' I )X EXTRAPOLATED FROM CREEP RATES * FROM RUPTURE TESTS LJ 0 Zi) Q() QL TRANSITION:. OF 3RD STAGE O0 I 1.5 22.53 4 5 67 8910 1.5 2 2.53 4 5 6789100 1.5 2 2.53 4 5 67 8910001.5 22.53 4 5 6 78910,CO TIME HOURS FIGURE 2. CURVES OF STRESS VS. TIME FOR INDICATED TOTAL DEFORMATIONS FO 19-9DL-STEEL FORGED DISC AT 1200~F. CON Fl DENTI AL R

CON FI DEN TI AL Q0Z 30 WO.. uJ,:,- *^....r. 6 0 1 coT —ME, HOR FIGURE 3.CURVESOFSTRESSVS.TMEFORINDICATEDTOTAE02. rMA I 9 H Dlr STEEL FfA 0 ______^,___" —-' —-' — -—,"' —,,,' - - m-.YTRAN' I 1.5 22.53 4 5 6 7 8910 L5 2 2.53 4 5 6 789100 L5 2 2.53 4 5 6 78910001.5 22.53 TIME., HOURS FIGURE 3. CURVES OF STRESS VS. TIME FOR INDICATED TOTAL DEFORMATIONS 19-9 DL STEEL FORGED DISC AT 1350~F. SITION:START D STAGE CREEF 4 5 6 789 10.C ) FOR CONFIDENTIAL

.- I i I ]I ESTIMATED X NRC PROJECT r n z 61 ULJ & w QD 0 Q.. I 1.5 22.53 4 5 6 7 8910 1.5 2 2.53 4 5 67 89100 15 22.53 4 5 6 78910001.5 22.53 4 5 TIME, HOURS FIGURE 4. CURVES OF STRESS VS. TIME FOR INDICATED TOTAL DEFORMATIONS FO LOW CARBON N155 ALLOY FORGED DISC AT 1200~AND 1350~F. 6 78910.000 rt~~~~~~~~~~~~~~~~~~~~~~~~~~~ )

60 I 1.5 2 2.53 FIGURL 5. 4 5 6 78910 1.5 2 2.5 3 4 5 6 7 89100 1.5 2 2.5 3 4 5 6 7 891000 1.5 2 2.5 3 4 56 7 8910,000 TIME, HOURS CURVES OF STRESS VS. TIME'OR.INDICATED TOTAL DEFORMATION FOR - 234-A-5 -DISC AT 1200'F.

15. B. 19-9 DL Turbosupercharg er Discs at 1200 and 1350~. The investigation of these discs was originally undertaken to establish 2000 hour rupture strengths for "hot-cold" worked 19-9 DL steel at 1350~F. However, at the September 21, 1944 Subcommittee meeting it was requested that further work at 1350~F, be stopped and that data be obtained at 12000F. for comparison with the large disc -4e t — ) -and typical bar stock (See Section C) from the same heat, The discs are described and the available test data are presented in Table VIII. The rupture test data are compared with those for the other conditions in Figure 6. The data at 1200~F. are as yet too incomplete to permit drawing conclusions. At 13500F. the "hot-cold" worked discs have rupture strengths similar to the large forging up-to about 100 hours. At longer time periods they were somewhat weaker. Their extension to fracture was considerably less- than that- of the large disc. The solution heat-treatment of disc VD-1957 prior to "hot-cold" work did not appreciably change the rupture test characteristics over that of the forged and "hot-cold" worked disc VD-1952.

16. Table VIII 19-9 DL TURBOSUPERCHARGER WHEEL BLANKS Heat Number: B-10429 Chemical Composition C Mn Si Cr Ni Mo W Cb Ti S P.33 1.44.65 19.10 9.05 1.35 1.14.35.16.015.016 Manufacture The heat was a 10,000 pound arc furnace heat. Type "B" supercharger wheels were made from billets by the Steel Improvement and Forge Company. Section VD-1952 was forged with the regular Steel Improvement and Forge Company practice. A contour forging is made from billet stock at 21000F. by upsetting in a die with a finishing temperature of about 1800~F. The forgings are allowed to cool to room temperature, inspected and conditioned for "hot-cold" work. The blanks are then reheated to 13000F. and struck about 10 times in a die with a hammer so as to produce a Brinell hardness of 270 to 300. Section VD-1957 was manufactured in a similar manner except that the hot forged blank was solution treated at 2100~F. for one hour and air cooled prior to "hot-cold" work. Heat Treatment Stress-relief annealed by heating at 1200~F. for five hours. Rupture Test Data Rupture Temp. Stress Time Section ~F. Lb, /Sq.In. Hours Elongation Reduction of % in 1 In. Area. % VD-1952 (no solution treatment) 1200 1350 50,000 45,000 40,000 22,500 20,000 15,000 40,000 35,000 25,000 20,000 17,000 141 289 282.5 1.5 1.0 1.0 3.7 1.2 1.2 152.0 2.0 3.7 235.0 3.0 4*0 601.0 0.0 0.0 In progress 96 hours 11-10-44 In progress 696 hours VD-19 57 (solution treated) 1200 1350 62.0 172.0 348.0 2.0 4.0 2.0 3.7 3.1 2.3

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18. C. Typical 19-9 DL Bar Stock Complete tensile, rupture and time-deformation data at 1200~F. have been requested for 19-9 DL steel bar stock in the following conditions: 1. Hot rolled and stress relieved 2. Hot rolled + "hot-cold" work + stress relieved 3. Annealed (solution treated) The request originally included similar information at 1350~F. The low strength of this alloy at 1350~F., however, led the Subcommittee to request that further work at 1350~F. be stopped when the tests in progress on September 21 were completed. The test materials are described in Table IX together with the available tensile and rupture test data. The stressrupture time curves are shown in Figure 7 and time-deformation curves in Figures 8 and 9. The 1200~F. rupture and deformation data for hot-rolled stock, Heat N163, has been largely taken from Universal-Cyclops data. Only partial results are available for the other two conditions. According to Figure 5, the 1200~F. rupture strength of the hot-rolled bar is higher than that of the large disc reported in Section A and lower than the "hot-cold" worked bar. The latter. however, is weaker than the original "hot-cold" worked induction heat of 19-9 DL steel. The solution-treated bar stock will apparently have rupture test characteristics similar to the large asforged disc.

19. The time-deformation curves snow somewhat greater strength at 1200~F. for the hot-worked bar stock than for the large disc. At 1350~F., however, this material is even weaker than the large disc as may be seen by comparing Figures 9 and 3.

20. Table IX TYPICAL 19-9 DL BAR STOCK Type Material Hot-rolled bar stock Hot-cold worked bar stock Solution-treated bar stock N163 at 1200~F. and B-10429 (Bar #2) B-10429 (Bar #3) at 13500~F B-10429 (Barn 1) Chemical Analyses Heat No. C Mn Si Cr Ni Mo W Cb TI N2 N163 B-10429.30.85.57 18.88 9.31 1.25 1.18.33.19.025.33 1.44.65 19.10 9.05 1.35 1.14.35.16 --- Manufacture N163: - Hot-rolled 3/4-inch round cornered square bar stock. B-10429, Bar #1: - Finished in the mill at about 1900~F. as 7/8-inch bar, stock. B-10429, Bar #2: - Finished in the mill at 1650~F. as 7/8inch square bar stock. B-10429, Bar #3: - Normally processed hot-rolled 7/8tt square bar. Treatment 1163 and B-10429, Bar #2: - Stress relieved at 12000F. 3-10429, Bar #t3 Rolled to 20% reduction in area at 1200~F. and stress relieved at 1200~F. for 1 hour. B-10429, Bar #1 - Heated 1 hour at 2100~F., air cooled, and stress relieved at 1200~F. for one hour.

Table IX (Continued) Room Tem erature Tensile Properties of Tyical 199 DL Bar Stock Tensile Offset Yield Strengths Strength Lb./Sq.In. Lb./Sq. In..02% 0-1% 0.2% Proportional Limit Lb./SQ. In ReducElongation tion of Brinell in 2 In. Area,% Hardness Heat No. N163 Condition Hot rolled 118,250 116,750 55,500 66,000 69,000 54,000 63,500 66,500 44,o00 37,500 58.0 54.5 54.7 56.8 216 214 B-10429 Bar t!3 "Hot-Cold" Rolled 20% 152,500 97,500 118,500 121,000 155,900 103,000 123,000 129,000 72,500 75,000 24.5 24.0 44.0 43.5 321 335 12007F. Rupture Test Results for Typical 19-9 DL Bar Stock Heat No. N163* Condition Stress Rupture Time Lb./Sq. In. Hours Elongation %~ Reduction in Area. > Hot rolled 48,000 45,000 40,000 37,000 68.0 199.5 498.0 1111.0 17.0 15.0 11.5 14.0 18.8 28.0 19.0 29.5 B-10429 "Hot-Cold" Rolled 20% -at 1200~F. 60,000 55,000 50,000 46,000 40,000 36,000 36.0 2.0 1.2 123.0 2.0 2.0 157.0 2.0 4.0 420.0 2.0 2.7 843.5 2.5 4.2 In progress 216 hours 11-10-44 B-10429 Solution treated 45,000 1 hour at 2100~F., 40,000 A.C. + 1 hour at 36,000 12000F. 60.0 180.0 TIIg a cc -lLo 1' 1' 0.0 14.0 2.0 25.6 L3as - a ~QI43 3I -'. -,Ra)lp~ *Universal-Cyclops data. Ho e<i

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t EXTRAPOLA'TED CREEP DATA * FROM RUPTURE........ / 8 910 1 2 TI ME, HOURS FIGURE 8. CURVES OF STRESS VS. TIME FO,. INDICATED TOTAL DEFORMATIONS A1 FOR TYPICAL HOT-ROLLED I 9 DL STEEL (HEAT N 163 HOT-ROLLED + STRESS-RELIEVED - 200~F0 AT 1200RF. H

CONFID ENTIAL TIME, HOURS FfGURE GURVES OF STRESS VS. TIME FOR' DICATED TOTAL DEFORMATIONS AT 13' FOR HOT ROLLED 19-9DL STEEL BAR STOCK CONFIDENTIAL'. F

25. D. S816 and S590 at 13 500F. In view of the exceptionally high strength of these two alloys in induction heats, further investigation of the!rupture test properties of 800 pound heats is in progress. The available information for the two type heats is summarized in Table X and the stress-rupture time relationships are shown graphically in Figure 10. As agreed at the May 11, 1944 subcommittee meeting the solution temperature of S816 was reduced to 2300~F. for the 800 pound heat. The S590 material cracked on quenching from 2300~F. and it was necessary to reduce the temperature to 2270~F. The data indicate that the large heat of S590 has slightly better strength and elongation in the rupture test than did the induction heat. At time periods up to about 1000 hours the reverse was true in the case of alloy S816. This may be due in part to the lower solution temperature used for the large heat specimens. The S816 samples, however, still had considerably higher strength than the S590. The following tabulation compares these alloys with other alloys under investigation on the basis of 13500F. rupture strengths:

26. Alloy S816 (Induction Heat) S816 (800# Heat) S590 (Induction Heat) S590 (800# Heat) Low Carbon N155 Bar Stock(l) Low Carbon N155 disc 19-9 DL Bar Stock(l) 19-9 DL Disc 234-A-5 Bar Stock(') 234-A-5 Disc *Data incomplete. (1) ACR No. 4C22. Stress for Rupture in Indicated Time Periods 100 Hours 1000 Hours 44, 000 31,500 35,000 30,000 31,000 24,000 32,500 26,000 36,000 27,500 31,000 24, 500* 35,000 20,500 23,000 15,500 22,500 12,500 19,000 12,500 These strength values definitely indicate that consideration should be given to both S590 and S816 alloys for 1350~F. service. The bar stock data are promising enough to warrent investigation of manufacturing characteristics and properties of large discs.

27. Table X ALLEGHENY LUDLUM ALLOYS S590 AND S816 Chemical Analyses Alloy C Si Mn Cr Ni Co Mo W Cb Fe Induction Heats 800 pound Reats S590.49.21.60 19.50 19.78 19.35 3.95 4.15 4.04 a1. S816.47.54.58 19.50 20.23 43.70 3.93 3.45 4.06 2.95 S590.47.71.94 20.28 20.55 20.00 4.08 4.22 4.72 Bal. S816.38.25.82 18.87 19.70 45.64 4.04 4.71 3.43 2.94 Manufacture Induction Heats - 17-pound induction furnace ingots were forged to about 1-inch square bars and then rolled to 1/2inch rounds. The hot working temperature for S590 was 2200~F. and 2250~F. for S816. 800 Pound Heats S590 - 7/8-inch round bar processed from 850 pound arc furnace Heat 50254. S816 - 3/4-inch round bar processed from a 4-inch ingot cast from 800-pound arc furnace Heat 50257. The ingot was forged from 2300~F. to a 2-inch square and rolled from 2250~F. to size. leat Treatment Inruction Heats 590 - Solution treated one hour at 2300~F. and water quenched by Allegheny-Ludlum. Aged 16 hours at 1OO0~F. at Michigan. S816 - Solution treated one hour at 2350~F. water quenched. Aped 16 hours at 1400~F. 800 Pound Heats S590 - Solution treated at 2270~F. one hour, water quenched. Aged 16 hours at 14000F. S816 - Solution treated at 2300~F. one hour, water quenched. Aged 16 hours at 14000F.

Table X (Continued) Tensile Properties of S590 and S816 800 Pound Heats) Tensile Temp. Strength AlloZy ~F. Lb./Sq.In. Offset.02 Yield Strengths Lb./Sq. In..10o.20% Proportional Limit.Lb./S,.In Elongation % in Reduction 2 Inches of Area,. Brinell Hardness 298 302 S590 Room Room S590 1350 1350 160, 500 158, 500 66,875 64,875 58,500 55,000 42,500 38,000 82,000 77,500 53,500 51,500 89,500 87,000 58,500 56,500 30,000 30,000 22,500 17,500 10.0* 8.5* 27.0 29.0 10.5 7.7 33.0 36.3 S816 Room Room S816 1350 157,500 159,900 65,000 72,500 81,000 87,500 89,500 96,000 45,000 47,500 32,500 31.5 23.5* 16.0 31.0 20.9 272 309 89,250 55,000 66,500 70,000 16.0 *Broke in gage mark. 1350.~-_ Rupture Test Results Specimen and Treatment....... Stress Lb./Sq.In. Rupture Time Hours Elongation % in 1 In. Reduction of Areaj S590 (Induction heat, 1 hr.- 23000F. W.Q. + 16 hr. 1400~F.) S816 (Induction heat, 1 hr. 2350~F. W.Q. + 16 hr. 1400~F.) S590 (800 lb. heat, 1 hr. 2270~F. W.Q. + 16 hr. 1400~F.) S816 (800 lb. heat 1 hr. 2300~F. W.Q. + 16 hr. 1400~F.) 30,000 27,000 40,OQ0 37,000 33,000 30, 000 26, Q00 35,000 32,500 31,000 30,000 142.0 355.0 182.0 307.0 73.0 212.5 940.0 113-.0 288.0 254.0 910.5 5.0 15.0 14.0 11.0 35.0 24.0 39.0 4.0 4.0 4.0 6.0 13.0 21.8 13.1 15.4 55.9 56.5 59.6 6.4 5.2 10-.2 10.2

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30. E. Modifications of 1- DL Low Carbon N155 and Nl5 loys The chemical compositions of the twelve heats, as reported by Universal-Cyclops Steel Corporation, are given in Table XI. All test samples were obtained from hammer forged 7/8-inch square bars from 33 pound induction heats. The bars were in the hot worked and stress relieved at 1200~F. condition. The chemical analyses show considerable variation from the intended values particularly in regard to tungsten, columbium, titanium and nitrogen. In particular the low titanium recovery in the Low Carbon N155 alloys yielded alloys considerably off from the nominal compositions. Tungsten was omitted from Heat R-3188 and is high in Heat R-3190. Not only are the nitrogen contents erratic, but intended differences were not obtained for 19-9 DL steel. All work on this investigation, except the preparation of the report, has been completed. As a summary of the results the stress-rupture time curves are shown as Figures.11 and 12. Table XII has been prepared to compare the rupture strengths and elongations at 100 hours. The extrapolated 1000-hour rupture strengths are also given, but not elongations since few of the tests were longer than 400 hours. Comparative values from other investigations have not been included since the standard alloy in each series was made and tested as a reference point for similarly processed materials. Briefly these results indicate the following general conclusions:

31. 1. Hammer forged induction heats give erratic results. 2. The data in general do not reflect the differences in chemical composition. For instance, there is nothing in the compositions of Heats R-3157 and R-3234 to account for the difference in rupture strengths. 3. Both of the above conclusions emphasize that other variations than chemical composition have a greater influence on high temperature strength. Past considerations of this finding have indicated that variations encountered in processing the metal are the most probable cause, Metallographic examination of the original materials indicate, likewise, that structural variations are present which cannot be attributed to chemical composition alone. The rupture test characteristics of the 19,9 DL series of alloys are generally lower than has been generally found for this alloy. Apparently titanium has little or no effect on Alloy N155, although all of the strength values are somewhat below those previously obtained. The rupture data on Low Carbon N155 alloys indicate that small additions of titanium are beneficial. However, other hot-worked materials previously tested had higher rupture strengths, particularly at 1350~F., than Heat R-3268. In fact, the previous data have been almost identical to the titanium-bearing heats.

Table XI CHEM[,ICAL ANALYSES OF IMODIFIED 19-9 DL, N155 AND LOW CARBON N155 ALLOYS Grade Heat No. C ~n1 Si Cr Ni Co _ _.m. _ _... W TMo_ Cb Ti N2 S P 19-9 DL 19-9 DL + 10< Co 19-9 DL + 205 Co 19-9 DL + 1' Cb (0' T.i) Low Carbon 19-9 DL + N2 19-9 DL + N2 R- 3157 R-3188 R-3233 R-3232 P-3190 R-3234.31.30.29.29.22.35.71.81.90.80.81.82.49,52.51.40-.46.47 18.46 18.95 19.20 18.50 18.10 19.34 9.40 -. 9.24 9.76 8.57 21.07 9. 41 -- 9.16 ~.. 9 49 ~.. 1.00 1.12. —- 1 29 1.38 1.35 1.47 1 39 2.15 1.37 1.34 1.39.20.37.38 1.33.36.35.29.34.23.04.40.11.12.025.022. 04. ----.02.027 —... 04 —-- ----.16 --.12 ---- N155 N,155 + 0.5 Ti N155 + 1.0 Ti R-3235 R-3236 R-3237.30 1.47.28 1.56.29 1.49.48 22.46 20.29 19.77 2.05 3.10 1.05 ---.55 22.88 19.87 20.41 2.00 2.98 1.40.50.57 23.14 20.37 20.50 2.03 3.14 1.08.88.20 --.-12 -----.22 — Low Carbon N155 Low Carbon N155 + 0.5 Ti Low Carbon M155 + 1.0 Ti P-3268 P-3271 P-3272.13.14.14 1.37 1.53 1.52.44.49.67 22.80 18.70 20.66 1.64 3.16 1.11 -- 23.06 18.77 20.88 1.89 3.22 1.25.20 23.30 18.09 18.82 1.94 4.28 1.11.38.13.12 -----

33. Table SN COMPARATIVE RUPTURE TEST CHARACTERISTICS OF MODIFIED 19-9 DL, N155 AND LOW CARBON N155 ALLOYS AT 1200 AND 13500F. 1000-Hour 100-Hour Rupture Test Properties Rupture Temp. Rupture Strength Elongation Strength AlOFbloy FL./Sg.In. in 1 In, Lb./ Sq.In. 19-9 DL (.12% N2) 1200 40,000 25 29,000 19-9 DL + 10% Co (0% W) 1200 42,000 25 37,000 19-9 DL + 20% Co 1200 42,000 15 36,000 19-9 DL + 1% Cb (0% Ti) 1200 46,000 15 36,000 Low Carbon 19-9 DL + N2 1200 51,000 14 42,000. 19-9 DL + N2(4jlayi) 1200 50 37,000 37,000 N155 1200 51,000 11 37,000 N155 + 0.5% Ti 1200 50,000 2'5 36,000 N155 + 1% Ti 1200 48,000 20 39,000 Low Carbon N155 1200 53,000 13 44,000 Low Carbon N155 + 0.2% Ti1200 58,000 15 48,000 Low Carbon N155 +0.38%Ti 1200 62,000 28 48,000 19-9 DL (.12% N2) 1350 20,000 27 12,000 19-9 DL + 10 Co (0 W) 1350 20,000 30 10,500 19-9 DL + 20% Co 1350 18,000 28 11,000 19-9 DL + 1% Cb (0% Ti) 1350 22,500 25 13,500 Low Carbon 19-9 DL + N2 1350 28,000 10 13,000 19-9 DL + N2(. 10AN)M 1350 25,000 12 17,500 N155 1350 23,000 11 15,000 N155 + 0.5% Ti 1350 27,000 21 15,000 N155 + 1% Ti 1350 21,500 19 13,000 Low Carbon N155 1350 25,000.9 15,000 Low Carbon N155 + 0.2%Ti 1350 34,000 24 21,000 Low Carbon N155 + 0.38%Ti 1350 38,000 25 23,500

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36. F. Vacuum Melting Comparison heats of vacuum and air melted Low Carbon N155 and Age Hardenable Inconel alloys were supplied by The Union Carbide and Carbon Research Laboratories, Inc. These test materials together with the rupture test data obtained at 1200~F. are given in Tables XIII and XIV. In the case of the Low Carbon N155 heats, erratic stress-rupture time data gives a somewhat higher average curve in Figure 13 for vacuum melted alloys than for the air melted. Both heats, however, are below the original heat of this alloy. The data for the Age-Hardenable Inconel does not show a difference between the two methods of melting. There is a slight tendency for a somewhat flatter curve in Figure 14 than was obtained for the original heat of this alloy.

37. Table XIII VACUUM AND AIR MELTED LOW CARBON N155 Chemical Analyses Type Heat Melting No. Cr Ni Co Mo W Cb N2 C Mn Si _ _ Vacuum J-582 21.5 19.5 19.5 3.0 2.0 1.0 0.10 0.18 1.50 0.40 Air J-585 21.5 19.5 19.5 3.0 2.0 1.O 0.14 0.20 1.50 0.40 Treatment Samples were submitted as hot worked by Union Carbide and Carbon Research Laboratories, Inc. Room Temperature Tens ie Properties Tensile Strength Sample Lb./Sq,. In. J582 J585 120,900 120,500 126,150 128,150 Offset Yield Strength Prop. Lb./Sq.In. Limit 0.o02 o 0.LbJSq. i. 48,500 62,000 67,500 32,500 51,500 63,000 67,500 37,500 54,000 65,000 69,500 40,000 58,500 68,500 74,000 45,000 Elonga- Reduc- Brinell tion, % tion of Hardin 2 In. Area,% ness 22.0 39.4 21.5* 24.1 33.5 33.8 20.5* 22.3 211 215 227 233 *Broke in gage mark. 1209~F. Stress-Rupture Results Stress Sample Lb./Sq.In. J582 55,000 50,000 45,000 45,'000 42,500 Rupture Time Hours 98.5 244.5 187.0 220 0 630.0 43.0 78.0 235 0 1788.0 Elongation Reduction in.^ ~ Area, % 20.0 11.0 25.0 17.0 12.0 7.0 7.0 7.0 11.0 34.0 12.1 31.9 8.5 25.6 10.2 10.9 9.1 13.3 J585 55,000 50,000 42,500 35,000

38. Table XIV VACUUM AND AIR MELTED AGE HARDENABLE INCONEL Chemical Analyses Type Melting Vacuum Air Heat No. Cr Ni Al Ti Mn Si I C J-608 15.16 69.78.37 3.29 J-598 15.16 72.68.52 3.45.78 1.63.08.28 1.08.07 Treatment The vacuum heat (J-608) was melted in air at a pressure of 4 mm of Hg. Heat J-598 was melted in air at atmospheric pressure. 10-pound induction heats were cast into 2-inch square ingots and forged into one-inch square bars. The bars were heated at 1950~F. for 2 hours and quenched in water. Ageing consisted of heating 16 hours at 1300~F. and air cooling. 12000F. Rupture Test Characteristics'Stress Rupture Time Elongation Reduction Samle Lb./Sq.In. Hours % in 1 In. of Area., Vacuum melted (Heat J-608) Air melted (Heat J-598) 60,000 55,000 50,000 60,000 55,000 50,000 45,000 96 132 300 1.5 2 4 7.8 3.9 3.3 6..4 4-4 2.6 60 156 255 404 an-'g d 1 4 1

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40. G. Alloys for Service at 1700 and 1800OF. Rupture tests up to about 400 hours duration are being conducted at 1700 and 1800~F. on several wrought and precision cast alloys which were considered to have promise for service at these temperatures. The rupture strengths which have been determined are given in Table XV and are compared graphically as Figure 15. The information for the wrought alloys is summarized in Table XVI and for the cast alloys in Table XVII. The stressrupture time curves are shown as Figure 16 through 27. The rupture strengths point to the following conclusions: 1. Possible 100-hour rupture strengths at 1700~F. are as follows: a. Precision Castings Rupture strengths up to 17,000 pounds per square inch with X-40, X-50, 422-19 and S816 having somewhat the highest strengths. b. Wrought Alloys Rupture strengths up to 10,000 pounds per square inch with SS16 and S590 having the highest values. Solution treating Low Carbon N155 alloy resulted in a material increase in strength. 2. Possible 1000-hour rupture strengths at 1700~F. are as follows: a. Precision Castings Rupture strengths up to 14,500 pounds per square inch with X-40 and X-50 showing the highest strengths.

41. b. Wrought Alloys Rupture strengths up to 5600 pounds per square inch with S816 having the highest strength. 3. Possible 100-hour rupture strengths at 18000F. are as follows: a. Precision Castings Rupture strengths up to 11,000 pounds per square inch with X-40 and S816 somewhat the strongest. b. Wrought Alloys Two values have been obtained, 5300 and 4900 pounds per square inch for solution treated S816 and Low Carbon N155, respectively..Possible 1000-hour rupture strengths at 1800~F. are as follows: a. Precision Castings Up to 9800 pounds per square inch with X-40 the outstanding alloy. b. Wrought Alloys One value, 3000 pounds per square inch, has been obtained for Alloy S816. 5. Precision Castings vs. Wrought Alloys. The available data on this subject indicates that in the case of Alloy S816 the cast specimens were about 50 per cent stronger than the wrought samples at 1700~F. and about twice as strong at l800~F. There was, however, relatively little difference between the wrought and cast specimens of S590. Since as a general rule cast materials are stronger in this test than wrought materials, the results for cast S590 may be abnormally low. The data on Low Carbon N155 definitely indicate that a high temperature solution treatment is necessary for wrought alloys if hig:h strength is to be obtained at these temperatures. 6. Elongation values as low as 4 per cent in one inch and as high as 23 per cent were obtained for the tests lasting about 400 hours. In no case, however, was extremely low extension to fracture encountered.

42. Table RUPTURE STRENGTHS OF CAST AND WROUGHT ALLOYS AT 1700 AND 1800~F. Temp. Stress for Rupture in Indicated. Time Periodc Alloy ~F. 1 Hr. 10 Hr. 100 Hr. 400 Hr. 1000 Hr. PRECISION CASTINGS X-40 X-50 422-19 S816 61 Vitallium 6059 s'590 1700 1700 1700 1700 1700 1700 1700 1700 * 1,/ 5 0/ 1,5.. 24 000 20,000 17,000,15,500 14,500. oo 5, 1Qo000 16,00 15,060*" 14,000/ 25,000v19,000' 15,000.'12, 500, 11,500:" 24,0o00 19,000/ 14,gO0 1a,500 -lt,00 21,000"17,000- 14,00012,500- 1l1,500^ 22,500'17,000 13,000-11,000. 10,000.-. 20,500' 16,000." 12,000.10,000 8,600,24.q 14,500- 11,000 9 9,400 8,400 -.' wpnfM1trl - ^ TT. Vn v~ ~V Li uA S816 S590 Sol.Treated L.C. N155 Hot Rolled- L.C. N155 1700 1700 1700 1700 1 "3 r X - X -V X G-t — 1 J3 isOv' "P"" 4o 7,,G00 0 76 13,000',^%400. 7.. -6, 20,000 12,500 " 7,600 5,800 4,800 16,000 10,000o 5,000" 3,3000 2,500o x-40 X'-50 422-19 S816 61 Vitallium 6059 S590 PRECISION CASTINGS 1800 15,500 13,000 11,300 10,300 1800 8IOo i-3(o - 1,Ooo0 8, i00k 1800 19,000 14,000 10,000 8, 000 1800 20,000414, 00,500 10 0- 9,000-. 1800 16,500 12,500-'. 8,630 6i00Y 1800 16,500 12, 500 9400 7,900. 1800 17,000 12,500, 9,300 7,700. 1800 16,000 11,500' 8,000. 6,600 WROUGHT ALLOYS 9,800 7,f00 7,100. 7,800 5,400' 6,800 5,800 — 3p.-'Sed. S816 1800 S590 1800 Sol.Treated L.C. N155 1800 b.. Tot..S. 1 5,7 50 it Io 15,500'. 8',10 5,300 3,8'00 4,900 3,500 4,900 3,500

4_3 Table XVI 1700 AND 1800~F. STRESS-RUPTURE PROPERTIES OF FOUR WROUGHT ALLOYS Chemical Analyses Heat Alloy No. C Mn SiCr Ni Co Mo W Cb Fe 2 Low Carbon A11534.15 1.74.37 21.66 19.40 20.48 2.76 1.90 0.79 -—.14 N155 *Low Carbon N155 --- 13 -- 21.50 19.00 19,00 3.10 2.10 1.05 -- (Welding Rod) S590 41572,47 1.35.82 19.40 19,07 19.26 4.03 4.00 3. 87 S816 50757.38.82.25 18.87 19-70 45.64 4.04 4.71 3.43 2.94 - *Approximnate analysi s, Manufacture and Heat Treatment Low Carbon N155 - Hot rolled, Heat No. A11534. Hot rolled to finishing temperature of about 1700OF. Stress relieved at 12000F., air cooled. Low Carbon N155 Solution treated. 1/4-inch welding rod. Heat treated at 1250~C. (2082~F.) for 1/2 hour followed by cooling in still air. S816 - Heat No. 50757. 800 pound arc'heat cast into T4 ingots. Rolled to 1/4-inch round. Solution treated at 2300~F. for one hour and water quenched. Aged 16 hours at 17000F. for 1700~F. rupture tests. Aged 16 hours at 1800~F. for 18000F. rupture tests. S590 2-ton electric furnace heat, teemed to 8" ingots and hammer cogged from 2250~F. to 3" square billets. These were hot rolled from 22000F. to 9/32" round bars which were centerless ground to size. The bars were solution treated at 2270~F.,for 1 hour and water quenched, then aged 16 hours at 17000F. for 1700~F. rupture tests and aged 16 hours at 18000F. for 1800~F. rupture tests.

lwo Ia.I1 44. Q.fte~ 8a^ao i9*-t lr x mG,T) ~gfA- Stress Alloy Lb /Sq.In. Low Carbon N155 ~ 23,000 Hot Rolled 17,000 10,000 8,000 6,000 4,500 3,500 Low Carbon N155 Solution Treated l-7t 23,800 15,000 8,500 7,000 5,500 / Io I 816. t, ". ": 31,300 12,000 11,000 9,000 7,500 7,000 24,100 16,000 11,833 9,000 1 )..,. j~ o >* ^ Vw S590 Rupture Time Hours S.T.T.T.' 08.84 11.. 0 24.5 49.5 169.5 318..0 S.T.T.T. 4.25 60.0 134.0 516.0 S.TT.T.T 1/0 63.0. 64.5 168.0 111.0 390.0 S.T.T.T. 2.43 S.T.T.T. 4.12 108. 0 *4 192.0 S.T.T.T. s.~ 66.5 119.0. 328.5 S.T.T.T. 2.65 Li6f t Elongatic 48.0 41.5 28.5 31.0 32.0 25.0 32.0 47 1 53 28 16, 1l0 11 0 18 0 8 0 6. 0 15.Q 52.0 59 0 40.0 67*0 11.0 9,7 32 3 7-d 51" 7 0 53O0 a *,3:n Reduc tion _ of Area.% 61. 3 59.8 8 38.2 ~" 34.7 7 37.5 - 27.5 528.5 54.3 55.3. -- 26. 7 17.8 -li 13.3 / z16.7 18.4 -- 5.0 J5.0 " 16.7 - 56.1 62.5 60.9 - k%,.'-. ".'58.6 44.7 6.7 "-" B...,, ts-.,,,: -' & i 0.'':/; i'"'"'* 33.4 Jl4.0 > 9.7 9.1v,-j 61.7 54.3 /" 1;, I I^Jta~le^^a Lsa tk Low Cabon: N155 Solution Treated,a a lY -" f. L - - S816 _'S590 16,100 11,000 /5,000 4,000 ~^.?o 3,000 22,200 5,000,5,000 4,000 18, 500 12,000 I 2O'w0 &i e> 4'RO'

45. Table XVII 1700 AND 1800~F. STRESS-RUPTURE PROPERTIES FOR EIGHT PRECISION CAST ALLOYS Chemical Analyses Allo_ Heat No. C Cr Ni Mo Fe Mn. Si Co...... 6059 6437 *0.50 26.85 **0.396 24.61 35.15 5.00 1.04 0.35 0.77 Bal. 33.50 5.34 1.00 0.20 0.76 33.55' Vitallium V-4705 *0.24 27.60 **0.21 26.66 3.06 5.13 1.76 0.98 0.63. —- 5.57 (Co + Ni 65.56 from 98%) Bal. by difference 422-19 1 0.,48 29.10 *-*0.54 26.24 13.90 6.20 1.20 0.52 10.81 6.21 1.10 0.32 0.63 Bal. 0.63 53.89 61 6258 -*0.44 23.70 **0.43 24.49 S590 0.57 20.11 W 0.16 5.18 1.04 0.54 ---- 5.15 1.00 0.64 W 20.64 3.63 4.50 0.67 W 19.80 3.61 3.42 0.42 W 20.0512.17 — ~ -- 9.69 7.23 0.55 0.64 S816 X50 0.48 0.58 Bal. Co + Ni 69.90 0.41 19.43 0.76 22.57 0.48 25.12 Cb 0.63 20.04 4.02 0.56 42.81 4.48 ---- )40.70 0.72 55.23 X40 *G.E. River UWorks analysis. **Haynes Stellite analysis. Manufacture 6059, Vitallium, 422-19, 61 - Precision cast 0.160-inch diameter l-inch gage section stress-rupture specimens. S590, S816 - Orecision cast 0.250-inch diameter 2-inch gage section rupture specimens. X50, X40 - Precision cast 0.250-inch diameter 1-inch gage section rupture specimens. (Continued)

Tabl&2 Aont ed-) Mtrw _ a 0Fr.B l 46. Alloy 6059 Temp. ~F. 1700 Stress Lb./Sq.In. 29,300 20,000 13,000 11,000 10,000 6059 1800 Vitallium 1700 Vitallium 1800 422-19 1700 22,500 14,000 10,000 9,000 8,000 34,000 25,000 14,000 13,000 10,500 25,200 15,000 10,000 9,000 8,000 v"o 5,5 00 6,800 35,000 21,000 15,000 18,000 14,000 13,000 Rupture Time Hours S.T.T.T. 1.18 60.0' 190.0 362.5 S.T.T.T. 4.45 44.0 156.0 281.0 S.T.T.T. 0.,43 35.0 144.0 625.0 Elongation 27.0 44.0 20.0 13.0 12.0 Reduction of Area,% 40.8 66.2.. 54.3 +.. — 31.9 -/. 32.4. 25.0 30.0 23.0 8.0 19.0 19.0 35.0 31.0 8.0 6.0 53.6 73.1 -" 45.0 26.7 / —h' 54.3 "'i 66.2 52.8... 58.0' 27.7 7' 21.0 " S.T.TT. 24.0 54.3 2.2 8 48.0 64.0 t —.' 76.0 17.0 42.2 - 97.,5 13.0 27.727 132.0.16.7 895.0 2 0 7.15.6 —. S.T.T.T. 18.0 41.8 5.2 15.0 39.8^ 47.0 6.0 28.2..16. 5 13.0 29.0 "... 170.0 7.0 16.0 346.0 6.0 13.3 422-19 1800 24,700 16,000 11,000 10,000 9,000 8,000 29,800 18,000 14 000 13,000 12,000 S.T.T.T. 3.37 44. Q 161.0 204.0 460 0 S.T T.T. 7.15 48.0 156.0 717.0 28.0 24.0 12.0 10.0 11.0 4.0 25.0 32.0 4.0 7.0 5.0 45.6 36.9 28.8'. 17.039.0j10.9 J51.9 9.7, 5.0 -" 61 1700 (Continued)

47. ~"' If d OJjpi8ritfd) Allo1 61 Temp. OF. 1800.~ Stress Lb./Sq. In. 24,200 15,0,00 11, 000 10,000 9,000 8,000 7,000 Rupture Time Hours S.T.T.T. 2.27 29.5 268.0 100.0 1U6.0 283.5 Elongation Reduction fo__ _of Area.^ 25.O 47.4 19.0 36.0/ 19.0 51.9 /< 5.0 8.5 9.0 12.1 V' 7 0 7.5 - 9.0 6.2 S590 S590 S816 S816 X40 X40 1700 1800 1700 1800 1700 1800 26,450 25,400 16,000 12,000 10,000 9,500 18,600 13,000 8,000 7, 500 7,000 6,500 34,000 21,000 15,000 14,500 14,000 13,000 25,900 17,000 11,000 10,000 9,000 32,600 23,000 18,000 17,000 14,000 25,950 12,000 11,000 10,000 S.T.TT.T S.T.T.T. 8.6 29.0 200.0 378.5 S.T.T.T. 4.43 96.0 185.0 137.0 480.0 S.T.T.T. 4.31 60.0 84.0 290.5 327.0 S.T.T.T. -3.5 74.0 156.0 385.0 S.T.T.T. 1.03 40.0 169.0 828.0 S.T.T.T. 41.0 196.0 688.0 13.5 16.5 16.5 15.5 14.0 8.0 27.0 25.5 14.0 11.0 12.0 5.0 13.0 7.0 7.0 14.5 2.0 6.0 12.0 16.0 11.0 9.0 7.0 38.0 45.0 26.0 20.0 25.0 28.0 34.0 19.0 9.0 29.5 32.2 40.5 - 39.8 8 --- 20.5 13.5 "40.5 34.2'." 33.0 22.6 26 27.7 14.6 24.8 21.3 J 19.0 22.0 5.5 5 8.7 - 21.3 26.6 17.7 " 16.7... 16.2 43.4 55.4 — 40.0. 43.2" 43.2 " 45.7 55.5 31.9 ~ 17.8 - (Continued)

48. Alloy X50 X50 Temp. OF. 1700 1800 Stress Lb./Ss. In.;(^),bbt 18,000 17,000 16,000 16,000 15,000 14,000 14,000 10, 000. 9,000 8,000 Rupture Time Hours 23.0 52.0 241.5 426.0 227.0 204.0 848.0' $.48 75.5 276.0 665.0 Elon ation Reduction of Area, 32.0 34.5 - 20.0 36.0'. 5.0 13.4L 4.0 2.5 14.0 27.2 -" 13.0j 23.6 -". 2.0 5.6.... 2&..... 30;''".... 17.0 38.4 -- *12.2'-12.2 9.0.9.1. -*Part of specimen near fracture missing.

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J -'I I - - - - 1; -,-.i -. 0.1, 2 3 4 5 6 I 8 9 O2 3 4 5 6 7 8 9 D 4 6 8 O TIME FOR RUPTURE, HOURS RGURE27. STRESS-~~~RUPTURE TMCUVES FOR ALO -50. AT 1700 AND I 4 |5 30 69F. i i?? q -.!t -- 8 91I000O 2 3 4I 567S 9^000. I

56.. Ceramic Coatings Rupture tests are in progress at 13500F. on Timken Alloy (16Cr-25Ni-6Mo) specimens coated by the Bureau of Standards with a ceramic material designated as coating A-68f. Since the application of the coating involved heating the specimens to 1650~F., both coated and uncoated specimens are being tested for comparison. The samples are briefly described together with the available rupture test data in Table XVIII and Figure 28. The rupture test data obtained to date indicate excellent adherence for the coating with high elongation to fracture. As yet comparative data for uncoated specimens is not complete enough to determine if the coating has any effect on the rupture test characteristics although the one test does not indicate an appreciable difference. The 1350~F. rupture tests on Timken Alloy reported in ACR No. 4C22 all indicate higher rupture strength than was found for the coated specimens. This may well have been due to the solution treatment of the former or an inherent difference between heats.

57. Table XVIII RUPTURE TEST CHARACTERISTICS OF CERAMIC COATED TIMKEN ALLOY AT 1350~F. Base Metal As rolled and stress relieved bar stock from Heat 10446 wqs machined into the 0.160-inch diameter specimens and supDloed to the N.A.C.A. for coating by the Bureau of Standards. The bar stock was the same material which has been used in the investigation of processing variables at the University of Michigan(l)(2). This bar stock was reportedly finished by rolling at 2110~F. to 1865~F. from 2-1/4-inch square bars to 7/8-inch square bars. Coating The specimens were cleaned by a light sand blast followed by immersion in a 3% nickel-ammonium sulfate solution at a pH of 5.6 to 6.4 at 65~C. A coating of mix A-68f was sprayed, dried and fired at 1650~F. for 7- minutes, A second layer was then applied in a similar manner. The resultant coating was approximately 0.0025-inches thick. A slightly oversize set of specimens was carried through the orocess without the application of the coating. These have been machined to size and are being tested for comparison with the: coated specimens. 1350~F. Runture Test Data Samples Stress Rupture Time Elongation Reduction Lb./Sq.In. Hours % in 1 In. of Area,% Coating A-68f 30,000 21.5 59 66.2 25,000 46.5 57 71.8 20,000 108.0 54 71.8 15,000 887.0 32 55.3 Uncoated 20,000 172.0 53 74.4 Apparently the adherence of the coatings has been very good in all tests. (l)"A Study of the Effects of Heat Treatment and Hot-Cold Work on the Properties of Four Turbosupercharger Wheel Alloys", Report No. 6 under Project M478 to the National Advisory Committee for Aeronautics from the University of Michigan, November 30, 1943. (2)tThe Effects of Heat Treatment and Hot-Cold Work on the Properties of Five Alloys", Report No. 9 to the National Advisory Committee for Aeronautics from the University of Michigan, February 26, 1944.

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59.. Segre ations in234A-5 Aloy During the course of fabrication of several large forgings of 234-A-5 alloy, segregations of excess constituents in a 9-inch square billet were observed by the Crucible Steel Company. One of the questions which this brought up was the effect of such segregations on the 1200~F. strength of the alloy. A limited number of rupture tests are being conducted on specimens from the surface and center of the billet to obtain information on this point. Prior to testing the samples were heated at 2050~F., transferred to a furnace at 1400~F. and held for 24 hours before a cooling in air. The rupture test results obtained to date are as follows: Stress Rupture Time Elongation Reduction Samples Lb./Sq,.In. Hours % in 1 In. of Area., Surface 40,000 84 17 21.2 37,500 122 26 40.8 35,000 640 16 28.8 Center 38,000 52 22 30.8 36,500 36 30 44.2 36,500 36 30 50.3 35,000 384 25 40.0 The stress-rupture time characteristics are graphically compared in Figure 29 with those of the large disc given in Section A of this report. The data indicate: 1. The greater amount of excess constituents in the center specimens resulted in somewhat lower strength and higher elongation than for the surface specimens with less excess constituent. The rupture times were quite erratic, however. 2. The rupture strengths of the billet specimens are apparently equal to or higher than the large disc.

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J. nvesttions o be Undertaken 1. Boron modified Low Carbon N155 alloy specimens are being supplied by H. C. Cross for rupture tests at 1200 and 13500F. 2. Precision cast 19-9 DL specimens have not yet been submitted. 3. Specimens of two alloys developed at Massachusetts Institute of Technology for the U.S. Navy have been received for tests at 1700 and 1800~F. This investigation was requested at the September 21, 1944 Subcommittee meeting. The two alloys to be tested are the following: Chemical Composition, Per Cent All__oy *C Cr Ni Co Mo W Ta 113VT2-2 1.13 128VT2-2 1.28 23 -- 67 6 -- 2 97NT-2 0.97 21 30 21 3 2.2 2 Only carbon was actually analyzed with the other elements being aim values, reportedly known to be quite close to actual values. The 113VT2-2 and 128VT2-2 specimens are being tested "as-cast" and both heats are to be considered as the same material. The 97NT-2 specimens were heat treated at 2260OF. for 1/2-hour and water quenched. Both alloys were melted in a small arc furnace and cast by the Austenal procedure in molds preheated to 1850~F. 4. Notice has been received that the Low Carbon N155 bar stock has been shipped for the investigation of manufacturing variables.