DEPARTMENT OF ENGINEERING RESEARCH UNIVERSITY OF MICHIGAN ANN ARBOR STATUS OF VARIOUS INVESTIGATIONS IN PROGRESS FOR THE NATIONAL ADVISORY COIMITTE FOR AERONAUTICS AT THE UNIVERSITY OF MICHIGAN February 8, 1945 Approved by A. E. White Written by E. E. Reynolds J. W. Freeman Project Number M478-A February 8, 1945

TABLE OF CONTENTS Page A. Large Forgings of Low Carbon N155, 234-A-5 and S590 Alloys............................... 2 B. 19-9 DL Turbosupercharger Discs at 1200~ and 1350~F.........*..*.....*......*.*....... 16 C. Typical 19-9 DL Bar Stock............,....... 19 D. S816 and S590 at 1350~F....................... 27 E, Vacuum Melting *......**...*.**.*........ 32 F. Rupture Tests at 1700~ and 1800~F...........,*, 36 G. Ceramic Coatings ***. **** ***..*..*. *.*........* 42 H. Low Carbon N155 + Boron......*************** 45

STATUS OF VARIOUS INVESTIGATIONS IN PROGRESS FOR THE NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS AT THE UNIVERSITY OF MICHIGAN Feb- ary-ft 1945 Several related investigations are in progress at the Department of Engineering Research of the University of MVichigan for the National Advisory Committee for Aeronautics uder contract NAw 3781 covering a general research program for the development of heat-resisting alloys for aircraft power plants. In view of the long time required for the completion of the investigations a series of "status" reports have been issued prior to meetings of the Subcommittee on Heat-Resisting Alloys, Committee on Power Plants for Aircraft so that the members could be guided by partial results The last'status.' report was issued under date of lNor-b t eaber 10, 1944. Since that time two final reports have been issued Report ", nA Metallurgical Investigation of a Large Forged Disc of 19.9 DL Alloy* January 12, 1945. Report 4, "The Effect of Chemical Composition Modifications on the High Temperature PropertTet of 19-9 DL, N155 and Low Carbon 155:: Alloy, January 25, 1945 The "statust: reports are intended to be brief factual presentation of partial results. The data have not been cheked as in the preparation of final reports. ltkeise,# further data from subsequent work may show that values and trends should be modified. All stat.ementsA data and fiures. in thia.ren ort I * therefore. teIntaive a4 -r.a r b4 tc.: a.Qo Int_ Aia 1. results b.ecomo availablte

2. A. Large Forgings of Low Carbon N155. 23A-A,-5 and S590 Alloys Rupture test characteristics and time-total deformation characteristics are being determined at 1200 and 1350F. for several large disc forgings of the type intended for use as gas turbine rotors. These properties are being completely determined for one of the Low Carbon N155 discs and one of the 234-A-5 discs. The other discs are to be evaluated by a few rupture tests and by 1000-hour creep tests at 1200~F. under stresses of 25,000 and 35,000 pounds per square inch, in accordance with the action of the subcommittee at the November 28, 1944 meeting. Further investigation of the discs at 1350~F. is planned when time and equipment permit. 1. Low Carbon N155 Discs Six discs, Table I, representative of various treatments, two sources and two heats are being studied. Complete rupture and deformation studies are being made on the Universal Cyclop. disc NR66D. The rupture test data obtained to date, Table II, Table VII and Figure 1 show that the discs from Crucible Steel Co. have lower rupture strength than disc NR66D. There is apparently relatively little difference in strength due to the various treatments. The comparative time-deformation characteristics, Table VIII and Figure 2 show considerable variation between the treatments given three of the Crucible discs, although all are weaker than NR66D. 2. 234-A-5 Alloy Discs Three discs, Table III, representing two heats and three treatments are being tested. A further variable is the higher carbon content of the dise-i: from Heat 1X2280, Complete data are being obtained on the dise from Heat 1X2218 at 1200oF* and only partial data on the other two.

3. The rupture test data obtained to date, Table IV, Table VII, and Figure 1, indicate that the two high carbon discs from Heat 1X2280 will be considerably stronger than the lower carbon disc from Heat 1X2218. Stress-time for deformation curves for the disc from Heat 1X2218, Figure 3, and Table VIII, are nearly complete while no creep tests have yet been started on the other two discs. 3. S590 Discs Two discs of S590 alloy, Table V, representing one heat and three treatments are included in this program. Relatively little difference in rupture strength at 1200~F. resulted from the three treatments considered, Table VI, Table VII, and Figure 1, although the solution treated samples had lower ductility to fracture. One creep test is in progress on the as forged and aged disc, Table VIII and Figure 2. At 1350~F. the solution treated disc will be stronger than the as-forged and aged disc and equal to bar stock (Section D)0 4. Comparative Properties Of the alloys tested the as-forged and aged S590 disc has the best properties at room temperature, Table IX. As forged Low Carbon N155 disc NR66D and the S590 discs will apparently have the highest rupture strengths and timedeformation characteristics, Tables VII and VIII.

\v Table - Description of Low Carbon N155 Alloy Discs Chemital Com.osftion C Ni IN I MS~. Mube CC NR66D - -15 1.74.37 21.66 19.40 19.02 2.76 1.90.79.14 WR66E 1X2232.07 1.68.60 20.80 20. 206 20.07 2.94 2.67 1.05.125 lWarwftu raIn Progedure Disc NR66D was produced by the Oniversal-Cyelops Steel Corporation as a 20-inch diameter X 3-5/16 inch thicc forig inished at 130pF. and stress relieved at 1200~F. for two ho Three discs were produeed trom Heat 1X2232 by the Crucible Steel Company. A 15-inch squa ingot aiae m fro a one-t pninduction furnace heat. A 9 eh square billet was cogged on a 7- n* hatmer from the AI-fEt at 2100/2150F.'Three reheatings were required in this operation. The billet was groImapickled, chippe and cut into slugs weighing 225 pounds slugs were re9heated to 21f7215o0P' vand upset to discs 14-3/4-inches in diameter X 4-3/8thick on a 20 pound hammer, the finishing temperatures being approximately 1500?F. Five representative conditions were produced by cutting the discs in half and subjecting them to the following treatens: Aa e MOne-half of dis So. 1. A:Forei * Aed +at 1500QF: One half of disc No. lwas heated to 1500~F. for 24 hours. po3ton?(eated + Arg: at ^ ^,: D0,Pisc No. 2 was heated to 2200yF. and quenched in wa'^^^.^^y ^ ^ b —,- f ^- aitb wa-s hated F. to 1500?,' for 24 hours. Solu Tres'+... d^ se NO. 2 was reheated to: 1350~oF Solution Treated + Wot-'*.'.- re4f... r:d;:Afd:at:: O0_ Disi o*.N 3 was'. lefot l/about 1/inch oversize in the u....:.......................D...........................................t aou "ch overstse in te u e.tting operting, reheated to 2250?F. and water que: After reheat%:o:00~. for 3 hours it was reduce:approximately 1/8 ich in th ickess (approx 3% redu the flniashi inatre being about 1OF*:-The f: treatment-: wi; b:d: at 1500F,-for 24 hourJl ours. re. The -inches ter. pnched. d ction), inal $

5. Table II Rupture Test Characteristics of Low Carbon N155 Discs (Radial Specimens in Center Plane of Discs) Disc Temp. F. As forged NR66D 1200 Stress Lb./Sq. In. 77,000 72,000 55,000 50,000 45,000 40,000 52,000 45,000 35,000 30,000 25,000 25,000 23,000 20,000 Rupture Time Elongation Hours % in 1 In. 1350 1.07 2.35 94,0 204.0 502.5 1461.0 1.05 4.47 36.0 186.0 432.0 738.5 1734.0 1336. 0 9 26 12 10 7 12 29' 12 23 9 10 7 5 5 Reduction of Area.% 16.0 21.8 10.9 9.7 8.5 16.7 33.0 16.7 33.0 11.5 19.5 9.1 6.2 6.0 As forged Heat 1X2232 (14-3/4" Diam. X 4-3/8" Thick) 1200 As forged 1200 + aged at 1500~F. Heat 1X2232 Solution Treated 1200 + Aged at 1500~F. Heat 1X2232 Solution Treated 1200 + Aged at 1350~F. Heat 1X2232 Solution Treated 1200 "Hot-Cold" Worked + Aged at 1500~F. Heat 1X2232 55,000 47,500 45,000 40,000 50,000 45,000 40,000 37,500 50,000 45,000 40,000 50,000 40,000 35,000 48,000 45,000 40,000 10.0 40.0 178.0 613.0 51.5 143.0 237.0 504.0 26.5 80.0 205.0 7 10 8 15 35 36 31 19 15 15 20 12.1 17.8 18.9 17.8 43.7' 41.8 24.5 21.7 20.0 22.3 24.5 17.2 15.6 hrs. 2-1-*5 k- zq*s 23.9 27.7 24.5 11.0 13 188.0 10 In progress 11 61.0 139.0 228.0 23 20 7

Table Ir Description of 234-A-5 Alloy Discs Cemical Co.mosition Disc Heat No. C Mn Si Cr Ni Mo W Cb. —-- 1X2218.25 4.14.25 18.32 5.76 1.46 1.51.95 #5,#6 1X2280.42 4.47.41 18.06 5.20 1.30 1.20.28 Processing Procedures The disc from Heat 1X2218 was forged to a 20-inch diameter x 3-5/16-inches thick disc. The finishing temperature was 1400~F, and the finished disc was stress relieved at 1200~F. for 4 hours. Discs #5 and #6 from Heat 1X2280 were made from a 15-inch square ingot. The ingot was hammer cogged on a 7-ton hammer to a 9-inch square billet. 290-lb. slugs from the billet were heated to 2150~F, and upset and rounded to a 20-inch diameter X 3-7/8-inch thick discsin one heat on a 7-ton hammer. The finishing temperatures were 1650~F. Disc #5 was air cooled from 2050/2100~F., heated to 1420~F, and "hot-cold" worked on a 7-ton hammer to 3-1/2-inches thick. The estimated finishing temperature was 1250~F. and the disc was stress relieved at 1200~F. for 4 hours, Disc #6 was heated to 2050/2100~F. and air cooled to 1400~F. and held 24 hours, air cooled After reheating to 1420~F. it was "hot-cold" worked on a 7-ton hammer to 3-1/2-inches thick. The estimated finishing temperature was 1250~F. and the disc was stress relieved at 1200~F. for 4 hours. 0s

Table IV Rupture Test Characteristics of 234-A-5 Alloy Discs (Radial Specimens at Rim in Center Plane of 20" Diameter Discs) Temperature F. As Forged Heat 1X2218 1200 Stress Lb./Sq.n. 48,000 45,000 35, 000 32,500 30,000 28,500 Rupture Time Ho. urs 1.09 5.0 127.0 196.5 974.0 1596.0 Elongation in 1 IZn 28 31 32 19 18 13 41.8 46.5 48.3 51.9 38.8 33.0 Reduction in Area I 1350 32,000 20,000 17,500 15,000 12,500 1.65 71.5 216.0 420.0 1080.0 38 39 25 15 13.5 50.5 48.3 46.5 22.3 12.2 #5 Sol. treated "hot-cold" work Heat 1X2280 #6 Sol. treated + aged + hiotcold" work Heat 1X2280 1200 1200 40,000 35,000 40,000 41.0 39 In progress 216 hours 2-8-45 In progress 144 hours 2-8-45 51.5 -3 *

VI Table V Description of S590 Alloy Discs Chemical Composition C Si Mn Cr Ni W Mo Cb Co P S.45.56 1.44 19.76 19.05 4.08 4.03 3.35 20.20.015.018 Manufacturing Procedure These discs were produced by the Allegheny-Ludlum Steel Corporation. 12-inch ingots were forged from 2250~F. to 9-inch square billets, air cooled and ground. The nine inch billets were upset forged from 2250~F. to rough 4-inch thick discs. Disc #1 - Reforged to 18-inch diameter 3-inch thick from 2250~F. #1-A Solution treated at 2300~F. for 3-1/4 hours and water quenched fl-B Some of Disc #1 was aged 16 hours at 1400~F. at Univ. of Mich. Disc 2 - Reforged from 2250~F. to 3-3/4-inch thick, cooled, then reforged in one heat to 18-inch diameter 3-3/8-inch thick (10%) from 2000~F. fhe disc was then aged for 16 hours at 1400~F.

9. Table VI Rupture Test Characteristics of S590 Alloy Discs Disc #2 Condition Forged plus aged at 1400~F. Temp. 1200 1350 Stress b. /Sq.In. 55,000 50,000 45,000 30,000 25,000 20,000 ReducRupture Time Elongation tion of Hours. in 1 In. Are. 69.5 150.0 372.5 60.5 180.0 In progress 72 21.0 17.0 9.0 12.0 8.0 hours 20.6 21.2 14.4 112.5 2-8-45 #1-A Solution treated 1200 55,000 50,000 45,000 59.0 493.0.0 6.0 3.0 7.9 8.5 7.3 1350 33,000 30,000 27,000 86.0 10.0 252.0 11.0 Starting 2-8-45 15.6 15.0 #1-B Solution treated plus aged at 14000F. 1200 50,000 In progress 144 hours 2-8-45

Table VII Comparative Rupture Strengths at 1200~ and 1350~F. of Low Carbon N155, 234-A-5, and S590 Allo. 9. y Discs Alloy Low Carbon N155 (0'R66D)' Temp. Treatment ~F. As forged 1200 Stress, 1 77,000 Low Carbon N155 As forged" 1200 (NR66E) Low CarbonI N155 Forged + aged 1200 (NR66E) at 1500~F. Low Carbon N155 Solution Treated 1200 (NR 66E) + Aged at. 1500F. ~Lw Carbon NT155-' Solution Treated 1200 (NR66E) + Aged at 1350~F Lb./Sq.In. for Rupture at Indicated Time Periods, Hours 10 100 1000 2000 65,000 55,000 42,000 39,000 55,0000 ^ 4, 000 3 8,000 _____-. 46,000 34,000. 56,000 44,000: 34,000 -j.M -M."* -... 50,000 42, 000 Low Carbon N[ (NR66E) 234'-A-5 234-A-5' 234-A-5* S590 S590 S 590* Low Carbon N] (NR661D) 234-A-5 S590*' S590* 155 "Hot-Coldn Worked 1200 + Aged at 1500~F. As forged 1200 Solution Treated 1200 + "Hot-Cold" Worked Solution Treated 1200 + Aged + "Hot-Cold" Worked Forged + Aged 1200 Solution Treated 1200 Solution TreateJT 1200 155 As forged 1350 As forged 1350 Forged + Aged 1350 - _ _ _ - _ _ _ _ _ _ 46,000ooo 35,500 37, 500 35,000 34, 000 30,000 49,000 42,000, 28,500 Ws,,~-.... 40,000+.. — ___ —-- _ —-- 53, 000 40,00. —--- -—..- 51,o00 43,000 -_-_- -_ —- _ 5,oo000+ i52,000 40,000 31,000 24, 500,~~~~~~~~~~~~~~. 22,500 33,500 _ _ __ _ 25,000 19,000 Solution Treated. —-- *27,500 ---- 32,000 12,-500 _ _3_ Juqk — 11,000 _ -_ - _ _ _ H 0 0 1350 *Data incomplete.

Table VIII Comparative Time-Deformation a for Discs Under a Stress pf 25,000 Lb./Sq.In. t.tof A,At "'.^''VM 2 0) | 9 5) ~Initial ours to Deformation Total Treatment 2 at 1200~F. Reach Indicated Deformations.5 Alloy Low Carbon N155 (NR66D) Low Carbon N155 (1X2232) Low Carbon N155 (1X2232) As Forged TotL i)Deformation at Indicated Time Period Hours:',- I0t,2.q3 IT C>0.^473 9t 00 ~ 0.113 435.70 As Forged I - — dmblm - -.A- - UN -lj L - -.a,'. 0.127 Sol. Treated + Aged at 1500~F. 0.127 65 600 9zr 9W-1 o,6LLf7 o IWqJ Low Carbon N155 (172232) 234-A-5 (1i2218) S590 Sol. Treated + Aged at 1350~F. 0.143 215 As Forged 0.133 20 T-Ai "-5 7S7 o-.,Jfo As Forged + 16 Hrs. at 1400~F 0.102 375,cr,o I', ow 14," 0,,ooozL &.;ocjc <?^ o. Oc7&i3

Table IX Comparative Tensile Properties for Forged Discs (Radial Specimens) Tensile Temp. Strength Oe, LbW c^oIn Offset Yield Stress Lb./Sq In. 0,02sa 0.1% O.2 Proportional Linit L bl[ J... Alloy 234-A-5: As Forged teat 1X2218 Low Carbon N155: As Forged NR66D " 1 Reduction Elongation of Area Brinell L. jI 2 -, Rardss 330,o 33.8 209 35.5 40.7 204 Room 108,800 37,500 53,000 59,000 22,500 106,900 37,500 50,500 56,000 22,500 Room 117,600 119,500 58,000 67,000 71,500 47,500 58,09O 69,000 73,500 45,000 I/A 8590: As tFrged + Room 16 Hr. at 1400~F S590: Solution Room Treated S590: Solution Room Treated + Aged 16 Hrr at 1400F 133,500* 72,500 130,600 69,000 125,500* 32,500 117,500 37,500 134,000* 45,000 91,000 53,000 _____ _m~-t 100,000 37,500. 59,000 22.50 59,000 22,500 30.0 32.0 9.0 39.5 30.5 22.0 11.5 267'.1.X.5:.. 343 229/4 27.2 211 18.8 255 48.1 52.2 I. X 211 211 234-A-5: As Forged 1200 Heat 1X2218 51,000 52,750 Low Carbon N155: As ForKed ]IR66Z^ 234-A-5: As Forged Heat 1X2218 Low Carbon 1155: As Forged frB66D 1200 83,000 83,0 o 38,000 37,000 48,000 47,000 40,500 15,000 39,000 17,500 50,000 27,500 49,000 25,000 34,500 15,000 34,000 12,500 40,000 20,000 27.0 27.5 17.0 25.0 40.0 40.0 24*0 53.2 45.8 33.8 33.4 55.7 56.0 24.8 1350 39,700 38,500 1350 59,750 32,000 32,000 37,500.H ft * * *AlAlegheny'-udlu data.

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CONFIDENTIAL - I I I I I * AS FORGED S 22000F WQ.+24 HR AT 15000~ F CRUCIBLE DISCS 0 2200~F W.Q,.+24 HR. AT 1350F A AS FORGED S590 DISC O.*,x UNIVERSAL CYCLOPS DISC NR66D:I _ _ ____ ~ ~ - ~- - ~ ~ ~ ~ ~ -- -- ---- ---- I -. - - --- -- M FIGURE 2 5 10 50 100 500 IO0O TIME, HOURS STRESS VS. TIME FOR INDICATED TOTAL DEFORMATIONS AT 1200~F FOR LOW CARBON N155 ALLOY DISC NR66D

CONFIDENTIAL I;;I I' - EXKThAPOL.ATE L lCREEP D.AT^A; FROM RUPXJTUfi. -, -I.. -.,...-..-.. - W-ra.4.a. II. i, f I.I, i, i,"I I. -, t.. i I. I, 1: A _ i 1.5 2 2.53 4 5 678910 1.5 22.53 2 2.53 4 5 67891000 1.5 2 253 4 5 678919000 TI iarl',.-j.. __rw. aI FIGURE 3. CURVES OF STRESS VS. TIME FOR AS FORGED 234-A-5 DIfSC AS.O.u INDICATED AT I1200F. TOTAL DEFORMATIONS FOR CHEAT IX 2218) I<

16. B. 19-9 DL Turbosuperchar.er Discs at 1200 and 1350?. The inve ti-gation of these diws 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 1200~F. for compoarison with the large disc (see Report 15) and typical bar stock (see Section C) from the same heat. The discs are described and the available test data are presented in Table X. The rupture test data are compared with those for the other conditions in Figure 4. There was no appreciable difference in stress-rupture time characteristics at 1200~F* due to the omission or use of a solution treatment prior to "hot-cold" working the discs. Comparative data in Figure 4 for "hot-cold" worked bar stock and a large disc from this same heat show that for time periods up to at least 1000 hours the "hot-cold" work was beneficial to strength. There was no appreciable difference between the discs and the bar stock from Heat B-1Q429 although the strength of the bar stock from Heat R-1803 was considerably higher. At 1350~F. 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.

Table X 17. 19-9 DL Turbosupercharger Wheel Blanks Heat Number: B-10429 Chemical Composition C n Si Cr Ni Mo ~ 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 1300*F. 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 Reduction Temp. Stress Time Elongation of Area Section ~F. Lb./Sq!In. Hours % in 1 In. % VD-1952 1200 60,000 26.0 5.0 3.7 (no solution 50,000 141.0 1.5 3 7 treatment) 45,000 289.0 1.0 1.2 40,000 282.5 1.0 1. 2 37,500 957*0 2.0 3 2 1350 22,500 152.0 2.0 3.7 20,000 235.0 3.0 4.0 15,000 601.0 0.0 0.0 VD-1957 1200 55,000 34.0 1.5 3.1 (solution 50,000 212.5 3.5 5.1 treated) 40,000 504.0 1.0 2.3 35,000 1475.0 2.0 2.4 1350 25,000 62.0 2.0 3.7 20,000 172.0 4.0 3.1 17,000 348.0 2.0 2.3

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19. C. Typical 19-9 DL Bar Stock Complete tensile, rupture and time-deformation data at 12000F. 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 XI together with'the available tensile and rupture test data. The stressrupture time curves are shown in Figure 5 and time-deformation curves in Figures 6 and 7. The 1200~F. rupture and deformation data for hot-rollea 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, Report 15, and lower than the "hot-cold" worked bar. The latter, however, is weaker than the original "hot-coldfl worked induction heat R1803 of 19-9 DL steel. The solution-treated bar stock will apparently have rupture test characteristics similar to the large as-forged disc.

20. The time-deformation curves show somewhat greater strength at 1200~F. for the hot-worked bar stock, Figure 6, than for the large disc, Report 15. The one point available for "hotcold" worked bar stock shows considerable improvement over the hot-rolled condition. The point for "hot-cold" worked bar stock was obtained from a creep test at 1200~F. of 1000-hours duration. The results from this test may be summarized as follows: Stress 25,000 Lb./Sq*In. Initial Deformation 0.128% LiZt Time to reach 0.2% 80 hours Total Deformation in 0.32% 1000 hours Creep Rate at 1000 hours 0.00011% per hour At 1350~F. the hot-rolled bar stock was weak as is shown by the early onset of third stage creep and excessive deformations under a stress of only 8000 pounds per square inch, Figure 7.

Table XI ~PICAL 19-9 DL BAR STOCK Type Material Hot-rolled bar stock Hot-cold worked bar stock Solution-treated bar stock N163 at 1200oF. and B-10429 (Bar #2) B-10429 (Bar #3) t 1350~F. B-10429 (Bar #1) Chemical Analyaes Heat No. N163 B-10429.30.85.57 18.88.33 1.44.65 19.10 NJ L. I!.BC.2 9.31 1.25 1.18.33.19.025 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 1900VF. 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 7/81 square bar. Treatment U163 and B-10429, Bar #2: - Stress relieved at 1200F. B-10429, Bar #3 - 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 2100OF., air cooled, and stress relieved at 1200~F. for one hour.

Table XI (Continued) Tensile Properties of Typical 19-9 -L Bar' Stock Tensile Temp. Strength -, OF Lb.Sq.In Offset Yield Strengths Lb./Sq.In..02% 0Q1%.L2 Heat No. N163* B-10429 Bar #3 Condition Hot rolled Room 118,250 55,500 66,000 69,000 116,750 54,000 63,500 66,500 Proportional Limit Lb./S.In. - 44,000 37,500 72,500 75,000 32,500 30,000 I Elonga- Reduction, % tion of B "f' l in 2 _In Areat..... g! 58.0 547 216 54*5 56.' 214 24. 5 44.0 321 24.0 43.5 335 "Hot-Coldw rolled 20% at 1200 F. Room 152,500 97,500 118,500 121,000 155,900 103,000 123,000 129,000 -W I - 1200 98,625 98,400 64,0oo 83,500 88,000 64,000 84,000 88,000 13.5 30.8 12*0 23.7 B-10429 Bar #1 Sol. treated 1 hour at 2100~F., A.C. + 1 hour at 1200~F. Room 1200 101,750 23,000 35,500 41,500 102,950 30,000 38,500 43,000 67,400 66,400 19,000 23,000 24,500 19,000 23,000 25,000 15,000 20,000 7,500 7,500 52.5 54.0 35.5 35.0 58.2 57.6 37.9 35.0 *Universal Cyclops data. N) N)

Table XI (Continued) 1200~F. Rupture Test Results for Typical 19-9 DL Bar Stock Heat No. N163* Condition Hot rolled Stress Lb./Sq. In. 48,000 45,000 40,000 37,000 Rupture Time Hours 68.0 199.5 498.0 1111.0 Elongation Reduction of ~ in 1 In....A&rea. % 17.0 15.0 11.5 14*0 18.8 28.0 19..0 29.5 B10429 Bar #3 "Hot-cold" rolled 20% at 1200~F. 60,000 55,000 50,000 46,000 40,000 36,000 35,000 36.0 123.0 157.0 420.0 843.5 978.01 Ifn progre~a 1344 2.0 2.0 2.0 2.0 2.5 hours 2-8-45 1.2 2.0 4.0 2.7 4.2 6.1 6p* 1 B10429 Bar #1 Solution treated 1 hour at 2100~F., A.C. + 1 hour at 1200~F. 45,000 40,000 36,000 32,500 60.0 180.0 693.0 10.0 19.0 30.0 __,,m a.. frs 14.0 25.6 33.5 tf,$ T-vv — -n ca a p A'w' t, 06 9. 10^. *Universal Cyclops data. O

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27. D. S816 and S590 at 1350QF. 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 XII and the stress-rupture time relationships are shown graphically in Figure 8* 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 8590 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. Of the two large discs of S590 being tested, Section A, the solution treated disc has the same rupture strength as the best bar stock, Figure 8 and the following tabulation. The as forged and aged disc, however, is considerably weaker, indicating the desirability of a solution treatment prior to service at 1350~F.

s816 (Induction Heat) 8816 (800# Heat) S590 (Induction Heat) 8590 (800# Heat) S590 Large disc (Forged + Aged)* S590 Large disc (Solution treated)* Low Carbon N155 Bar Stock(1) Low Carbon N155 disc* 19-9 DL Bar S ck() 19-9 DL Disc 234-A-5 Bar Stock(1) 234-A-5 Disc* *See Section A. (1) ACR No. 4C22. (2) U. of M. Report No. 15 t 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 27,500 -._ 32,000 36,,000 31,000 35,000 23,000 22,500 19,000 27,500 24, 500 20,500 15,500 12,500 12,500 o N.A.C.A.

29. Table XII ALLEGHENY LUDLUM ALLOYS S590 AND S816 Chemical Analyses Alloy Induction 8590 Heats S816 800 pound S590 Heats S816 C Si Mln Cr Ni Co Mo W Cb Fe.49.21.60 19.50 19.78 19.35 3.95 4.15 4.04 Bal..47.54.58 19.50 20.23 43.70 3.93 3.45 4.06 2.95.47.71.94 20.28 20.55 20.00 4.08 4.22 4.72 Bal..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. 8816 - 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. Heat Treatment Induction Heats S590 - Solution treated one hour at 2300~F. and water quenched by Allegheny-Ludlum. Aged 16 hours at 1400~F. at Michigan. S816 - Solution treated one hour at 2350~F., water quenched. Aged 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 1400~F.

Table XI Continued) Tensile Properties of S590 and S816 (800 Pound Heats) Tensile Offset Yield Strengths Temp. Strength Lb./Sq.In. Alloy ~F. Lb./SqIn. - 02 10%.20% S590 Room Room 160,500 158,500 58,500 55,000 82,000 89,500 77,500 87,000 Proportional Limit Lb./Sq.In. 30,000 30,000 22,500 17,500 Elongation % in Reduction 2 Inches of Area^l 10.0* 10.5 8.5* 7.7 Brinell Hardness 298 302 S590 1350 1350 66,875 64,875 42,500 38,000 53,500 51,500 58,500 56,500 27.0 29.0 33.0 36.3 S816 Room Room 157,500 159,900 65,000 72,500 81,000 87,500 89,500 96,000 45,000 47,500 32,500 28,900 31.5 23.5* 16.0 8.0 31.0 20.9 272 309 S816 1350 1350 *Broke in gage i 89,250 55,000 66,500 70,000 85.900 54.200 64,600 68,700 -. 16.0 10.0 narK. 1350~F. Rupture Test Results Specimen and Treatment S590 (Induction heat, 1 hr. 2300~F. 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.) Stress Lb. /S q In. 30,000 27,000 40,000 37,000 33,000 30,000 26,000 35,000 32,500 31,000 30,000 Rupture Time Hours Elongation % in 1 In. Reduction of Area.S 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 6.0 13.0 21.8 13.1 15.4 55.9 56.5 59.6 6.4 5.2 10.2 10.2 o 0

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32. B. Vacuum XMeltin 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 9 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, Figure 10. Likewise there was practically no difference between the present results and those obtained for the original heat of this alloy. The work on this subject is now completed and a report will be submitted as soon as possible.

33. Table XIII VACUUM AND AIR MELTED LOW CARBON N155 Chemic al Anayses Type Heat Melting No. Cr N1 Q9 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 1.0 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 Tensile Proe.rties Tensile Offset Yield Strength Prop. Elonga- Reduc- Brinell Strength Lb./Sq.In. Limit tion, % tion of HardSamp1e Lb./Sq.In. 0.029 0.1% 0.2% Lb8q.Tn. in 2 In. Area. nesm J582 120,900 48,500 62,000 67,500 32,500 22.0 39.4 211 120,500 51,500 63,000 67,500 37,500 21.5* 24.1 215 J585 126,150 54,000 65,000 69,500 40,000 33.5 33.8 227 128,150 58,500 68,500 74,000 45,000 20.5* 22.3 233 *Broke in gage mark. 1200~F. Stress-Rupture Results Stress Rupture Time Elongation Reduction in Sample Lb/Sq.In.. Hours.... W. Area; J582 55,000 98.5 20.0 34.0 50,000 244.5 11.0 12.1 45,000 187.0 25.0 J1.9 45,000 220.0 17.0 8.5 42,500 630.0 12.0 25.6 J585 55,000 43.0 7.0 10.2 50,000 78.0 7.0 10.9 42,500 235.0 7.0 9.1 35,000 1788.0 11.0 13.3

Table XIV Vacuum and Air Melted Age Hardenable Inconel Chemical Analy.Ses lType Heat No. Cr Ni: A1 Ti Mn Si............... c Vacuum J-608 15.16 69.78.37 3.29.78 1.63.08 Air J-598 15.16 72.68.52 3.45 *28 1.08.07 Treatment The vacuum heat (J-608) was melted in air at a pressure of 4a 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 oneinch square bars. The bars were heated at 1-950~F. for 2 hours and quenched of heating 16 hours at 1300~F. and air cooling. Tensile Prope'rties in water. Ageing consisted Tensile Temp. Strength Sample ~F. Lb./Sq.In. Offset Yield Strength Lb./Sq.In. 0.02 01 0.1%2:91,500 100,000 103>,00 89,500 101,500 104,700 Vacuum Room melted'159,125 160,000 Proportional Limit Lb./Sq.In.' 68,400 65,600 57,900 67,500 67,500 60, 500 Elongation,% in1: 2 In. 25.0 23.0 10,5 27.5 26.5 3.5 Reduction of Area % 29.8 29.0 Brinell Hardness 300 302 \-,,,'- v~~-160. 600,,- 99/ -1200 119,750 86,600 96,600 99,500 Air melted Room 175,000 100,000 113,000 117,000 (J-598) 175,O00 101,000 113,500 118,000 1200 112,375 84,600 98,800 102,300 1200~F. Rupture Test Characteristics 13.8 40.7 31.4 10.8 314 313 Sample Vacuum melted (Heat J-608) Air metted (Heat J-598) Stress Lb./Sq. In..., 60,000 55,000 5 50,000 60,000 55,000 50,000 45,000 Rupture Time Hours 96 132 300 60 156 255 404 Elongation % in 1 In. 1.9 2 4 1 4 1 2 Reduction of Area.% 7.8 3.9 3.3 6.4 4.4 2.6 2.3

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I1,, I....I.....1.11-.,II..+ "; I jI- - -1-4 -.-.;....".;. __4 1- — 1-1-1.1 ---... 1-1 ___, - — ___.'_ 70".-_'_-,,t___..._..._4_.' _.-_...I-1 _' -.'.l___7_. .-.-"._ __I I-. i-.- __ ...__ - _ _-, : 11-j;...; I1; 71'''!,I14'., ..II ,i,,;,-I11 -It-.-!:I"- -, -.,- - L.!:.' -.'.IiIIII-.... —-I -.- I - 1L- - -71 _____.. __ —-I.r .. I I -I-... I .___ - __ - -. —-—.r.-,-'. I -__I- — p — — __ ___ I- -_ —..'..I -1 , 1 —-7-7 - -1 —;.b __,:i'I ____ — 4.",I'.I,.," I'I;I, ":' iI-,I.I.. I I.II...1II '' ':!,II I- I:I!iI, ,;,..;.1.,. — _;- __ __r -.... I.t: _- - -i-l- -I1-t _- I. ':.' — ill-, - - I.,-II. 4 —- -___ _. - .. —-- .__.__ _ _ —__ -__ __ O.I~ 2 3 4 6 789. 4 3 4 6 78 9t 5 6 Tm t. ofP TestH Fi u r et o- EFFECT OF VACUUM ME LTINGO ON THE I1 ZOO 0 F.,RPTR E5 3 9100 2 3 4 i) 6; 7 8 9:0GOO;! 3 4. 6i 7i 89 i~i'""1 TRENGTH OF AGE HARD EN ABLE INCONEL ALLOY

36. F. Rupture Tests at 1700 and 800F. A report will be distributed in the near future covering the rupture test results from twelve alloys at these two temperatures,. Two further phases of this work are still in progress. 1. Two alloys from Massachusetts Institute of Technology (Table XV). 2. Strip specimens (Table XVI). The investigation of the M.I.T. alloys developed for the U.S. Navy was requested at the September 21, 1944 subcommittee meeting. The two alloys selected represent their better low and high cobalt alloys, Table XV. Alloys 113VT2-2and 128VT22were to be considered as the same materials although they were not from the same heat. The rupture test data obtained to date are compared graphically in Figure 1 with X-50, the highest strength alloy previously tested at these temperatures. Alloy 97NT-2 gave very erratic results but on an average was somewhat stronger than alloy X-50. Alloy VT2-2had a steeper slope with the result that it was equal to X-50 at 100 hours and considerably weaker at the longer time periods. The critical nature of the need for sheet materials for combustion chambers caused the subcommittee to request that the rupture test characteristics of representative sheet materials be investigated at 17000 and 1800~F. Table XVI lists the sheet materials which are to be submitted. Thus far only three of these have been received, Inconel, Type 309 Stainless and Type 310 Stainless. Actual analyses and conditions of fabrication for these have not

37. yet been reported. The materials received were 0.031" thick X 1-1/4" wide X 22" long. A gauge section one-inch wide by 2-3/4" long is machined in these before testing4 The results obtained to date, Table XVI and Figure 12, indicate that there is not much difference in strength or ductility between Inconel and Type 309 Stainless steel. Both are considerably weaker than hot-rolled Low Carbon N155 alloy, the weakest bar stock previously investigated.

38. Table XV 1700~ and 1800~F. Rupture Properties for Two Precision Cast Alloys Submitted by M.I.T. Chemical Analyses (approximate, except carbon) Alloy C Cr Ni Co 97NT-2 113VT2-2 128VT2-2 0.97 1.13 1.28 21 23 30 21 -- 67 Mo W 3 2.2 6 Ta 2 2 Manufacture and Heat Treatme Both alloys were melted in a small arc furnace and cast by the Austenal procedure in molds preheated to 1850~F. at the Massachusetts Institute of Technology. The specimens were 0,.250inch in diameter with 1-inch gage section. 113VT2-2 and 128VT2-2 were tested in the as cast condition. 97NT-2 specimens were heat treated at 2260~F. for 1/2-hour and water quenched. Rupture Test Data at 1700.and 1800~F. Temp. Stress Rupture Time Alloy ~F. Lb. Sq. In. Hours Elongation Reduction in 1 In. of Area. 97NT-2 1700 1800 113VT2-2 1700 19,000 17,000 15,000 15,000 14,000 13,000 11,000 17,000 15,000 14,000 13,000 88.0 134.5 412.0 61.0 490.0 329.5 108.0 173.0 252.0 651.0 7 5 2 8 3 3 4 14 19 12 9 11.5 8.5 3.9 12.1 7.1 4.7 10.9 20.5 25.7 20.2 12.8 128VT2-2 1800 12,500 11,000 9,000 66.5 102.0 300.0 16 20 20 33.0 37.0 30.9

39. Table XVI Sheet Alloys for Stress-Rupture Tests at 1700~ and 1800F. Nominal.Chemical Mialses Alloy Tpe Source C Co Mo (R)*Inconel G..**.13 13 AF-18 ".13 25 Vitallium.20 27 8816 ".35 18 (R)*309 *12 25 Co-Cr Low 30 446N2 C.S.Ct** 20 25 (R)*310o".15 25 327".15 27 329 " 10 24 330Q'.15 15 327/446.15 25 446.20 25 N155".10 21 75 20 2.5 20 12 15 20 4 3 35 1 20 Bal. 45 55 _ _em __mw 5.5 4 0the_ Fe-9 Mn-1, Si-0.5 Si-2 Cb-3, W-4 N2-0*15 1.25 __o.. 20.5 3 lNon-Hardening N2-.20 N2-*12, W-2.5, Cb-1 *(R) - Alloys received by 2-8-45. **G.E. - General Electric Company. ***C.S.C. - Crucible Steel Company of America. Samples in the annealed condition. Rupture Test Data at,?170QF. Alloy Stress Rupture Time Lb.LSL.In. Hours Elongation ~1n'2 In. Inconel 309 (25Cr-12Ni) 310 (25Cr-20Ni) 12,000 4,000 3,000 2,000. *m 4,000 3,000 2,500 3,000 0.2 45.5 118.0 In?rogress 36.0 o109.0 31.5 18.5 27.0 384 hours 2-8-45 27.0 21. 5 In rgroo 144 hia. g-4-45 Tin nro gi5.ii i 72 h*n i - 4a l 5 —AL.

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42. G. Cramic Coatings Rupture tests are in progress at 13500F, on Taken 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 1650eF., both coated and uncoated specimens are being tested for comparison. The samples are briefly described together with the available rupture test data in Table XVII and Figure 13. The rupture test data obtained to date indicate excellent adherence for the coating with high elongation to fracture. Comparative data for uncoated specimens shows, if anything, a very slightly higher rupture strength for the uncoated specimens. 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.

TSablo. XVII. 43. RUPTURE TEST CHARACTERISTICS OF CERAMIC COATED TIMKEN ALLOY AT 1350~F. Base Metal As rolled and stress relieved bar stock rrom Heat 10446 was machined into the 0.160-inch diameter specimens arn supplied to the N.A. CA. for coating by the Bureau of Stahdards. The bar:',::stock was the same material which has been used in the investigation of processing variables at the University of Michigan(1)(2). This bar stock was reportedly finished by rolling at 21100F. to 1865~F. from 2-1/4-inch square bars to 7/s-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 65C — A coating of mix A-68f was sprayed, dried and fired at 1650~F. for 74 minutes. A second layer was then applied in a similar manner. The resultant coating was approxitmately 0.0025-inches thick. A slightly oversise set of specimens was carried through the process without the application of the coating. These have been machined to size and: are being tested for comparison with the coated specimens. 1350.~F Rupture Test Dat Stress, Rupture Time Elongation Reduction Sample L/SIn.....Hoursu %:in i In. of Area,% Coating A-68f 304000 21.5 59 66.2 25,000 46.5 57 71.8 20,000 108.0 54 71.8 17,500 288.0 69.7 71.9 15,000 887.0 32 55.3 Uncoated 25,000 61.0 64 67.1 22,000: 112.0 51 69.5 20,000 172.0 53 74.4 17,500 443.0 67 71.1 Apparently the adherence of the coatings has been very good in all tests. (1) "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) "The 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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45. H-.!ow Carbon N155 + BO1on The improved properties reported by the Union Carbide and Carbon Research Laboratories for their Boron modification of Low Carbon N155 alloy indicated that the alloy had excellent promise for gas turbine applications. Most of the preliminary testing was done at 1500eF. The possibility of it being an improved wheel alloy led to the approval of investigation of the alloy at 1200OF. as bar stock and as a large forged disc. Two lots of bar stock were received at the same time, J573 and J597, of Table XVIII. Heat J573 was tested first at 1200F. with surprisingly low strength, Table XVIII and Figure 12. The rupture strength of this heat was considerably lower than had been previously obtained for standard Low Carbon N155 alloy bar stock and was only equal to that of the large disc (Section A). In view of the unexpected nature of the results it was decided to run tests on Heat J597 which was found to have the improved properties claimed for the analysis. The 1000-hour rupture strength of 52,500 pounds per square inch for J597 equals the highest value previously found, Alloy 6MM cold rolled 25% as reported in ACR No. 3D28, April 1943. As yet no explanation for the difference in rupture strength between the two heats of Low Carbon N155 + Boron is available. No work has been done on the sample from Heat N175,

46. Table XVIII Boron Modified Low Carbon N155 Alloy Heat o. J573 J597 N175.m Ni Si. 21.00 20.04 20.88 3.08 2.17 0.45 1.65 21.5 19*5 19.5 3.1 2.0 Analysis not submitted B C 2 0.37 0.20 0.14 0.38 0.12 0.12 Manufacture and Source Heat J573, in as forged condition. Machined 0*160" diameter specimens submitted by the Union Carbide and Carbon Research Laboratories, Inc. Heat J597, as forged from 50 pound experimental heat. Two 5-inch by 7/8-inch square bars submitted by Mr. H. C. Cross for Project NRC-8 as supplied to them by the Union Carbide and Carbon Research Laboratories, Inc. Heat N175, as hot rolled from 45-3/4 pound ingot (basic arc melting at Union Carbide and Carbon Research Laboratories, Inc.) Ingot hammer cogged from 2050~F. to 1750~F. to 2 inch square billet. Billet rolled from 2080~F. to 1800~F. to 7/8 inch square. One 8-inch by 7/8-inch square bar submitted by Universal Cyclops Steel Corporation. 1200~F. Stress-Rupture Results Specimen J573 J597 Stress Lb. lIn, 60,000 55,000 50,000 44,oo00 65,000 60,000 55,000 Rupture Time Elongation Reduction ol..rs s. in- I 1 In. of AreaA% 40.5 75.5 174.0 810.5 45.0 129.0 540.0 33 37 27 31 22 24 20 39.8 46.5 36.0 56.4 44.7 48.3 53.-6

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