FIFTH PROGRESS REPORT TO MATERIALS LABORATORY, WRIGHT AIR DEVELOPMENT CENTER DEPARTMENT OF THE AIR FORCE ON FOUR LOW-ALLOY STEELS FOR ROTOR DISKS OF GAS TURBINES IN JET ENGINES By A. Zonder J. W. Freeman PROJEC' AIR FORCE CONTRACT NUMBER: AF33(038)-13496 EXPENDITURE ORDER NUMBER: 605-227 SR-7 March 31, 1952

FIFTH PROGRESS REPORT ON FOUR LOW-ALLOY STEELS FOR ROTOR DISKS OF GAS TURBINES IN JET ENGINES SUMMARY This report is the Fifth Progress Report on an investigation being carried out for the Materials Laboratory, Wright Air Development Center, Department of the Air Force, under Air Force Contract Number: AF33(038)-13496 (Expenditure Order Number: 605-227 SR-7). The purpose of this investigation is to study the high-temperature properties of four low-alloy steels, 4340, "17-22A"S, H-40, and C-422, in the form of forged J-33 jet engine disks. A concurrent study of the high-temperature properties of the products of isothermal transformation of these four steels is being carried out, utilizing bar stock. Using the stress to cause 1-percent total deformation in 1000 hours at 11000F as a basis for comparison, the following isothermal structures had the best high-temperature properties: Stress to Cause 1% Total Deformation in 1000 Hours at 1100~F Steel Heat Treatment BHN (psi) h340 Aust. 1750~F + 28 Hrs. at 850~F 319 greater than 4,250 (Upper Bainite + Martensite) "17-22A"S N. 1750~F + To 10 Hrs. at 1200~F 291/317 19,000 H-40 No 1950~F + T. 18 Hrs. at 1200~F 312/320 27,800 C-422 O.Q, 1900~F + T. h Hrs. at 1200~F 307 30,000 The normalized 434O disk and both the normalized and oil-quenched C-h22 disks have been split and the center slabs cut out. These slabs have been magnafluxed and macroetched. The normalized C-422 slab showed two small indications of defects near the center on magnafluxing. These same indications appeared on macroetching. A Brinell hardness survey was made on each slab.

2 Room temperature tensile tests have been made on specimens cut from the center slabs of the normalized 43h0 disk, the normalized and interruptedquench H-OA disks, and the normalized and oil-quenched C-422 disks. The original testing program for the disks has been modified, the finally established procedureis detailed in the section on Procedure and Proposed Testing Conditions. The initial sorting survey at 1100~F to establish the rim properties of each heat-treated disk has been completed, and the following disks have been selected for further testing at 1000~, 1100~, and 12000F: (a) h340 - To be decided by Materials Laboratory (b) "17-22A"S - Disk #3 (Oil-quenched and tempered) (c) C-422 - Disk #h (Oil-quenched and tempered) No further testing of any of the H-O4 disks has been planned for the immediate future because of their high hardness and their low and erratic ductility values in the rupture test. An analysis of the microstructures involved in this investigation is now in progress. This analysis is to be used to correlate the results obtained from the isothermal transformation study with the results obtained from the disk study. INTRODUCTION This report covers the progress made between 1 January 1952 and 31 March 1952 on an investigation of the high-temperature properties of four ferritic alloys, 4340, tl7-22A"S, H-40, and C-422, in the form of forged rotor disks for gas turbines in jet engines. This investigation may be divided into two phases, namely: A. Disk Investigation 1. Determination of the effect of heat treatment upon the hightemperature properties of four ferritic alloys.

3 2. Determination of design data at 1000~, 1100~, and 1200~F for that heat-treated disk of each steel which has the best practical properties. B. Isothermal Transformation Investigation 1. Determination of the creep and rupture characteristics of the products of isothermal transformation of the four steels. This work is being done on bar stock to help explain the properties of the disks after various heat treatments. PROCEDURE AND PROPOSED TESTING CONDITIONS The following modified testing program has been approved: 1. 4340 Steel (a) Establish stress-rupture curves out to 1000 hours at 1000~F for all three disks. (b) Establish curves of stress versus time for 1-percent total deformation at 1000~F out to 1000 hours. (c) Establish stress-rupture curves and stress-time for 1-percent total deformation curves out to 100 hours at 11000 and 1200~F for the heat-treated disk showing the best properties at 10000F. 2. "17-22A"S, H-0O, and C-422 Steels (a) Establish complete design curves for these materials only at 1100~F for that heat-treated disk of each steel showing the best rupture properties at 1100~F. (b) Establish stress-rupture and stress-time for 1-percent total deformation curves out to 1000 hours at 10000F and out to 100 hours at 12000F for that heat-treated disk of each steel showing the best properties at 1100~F. 3. Continue the isothermal studies on 4340, "17-22A"S, H-40, and C-422 steels.

4 RESULTS The results obtained to date are presented separately for each steel under (1) disk investigation and (2) investigation of the properties of the products of isothermal transformation. Disk Investigation 4340 STEEL The center slab of the normalized and tempered disk was cut out, magnafluxed and macroetched, and found to be sound. A Brinell hardness survey was taken and is shown in figure 1. The over-all hardness range of the slab was 297 to 3h5 Brinell. The principal ranges were 297 to 320 Brinell at the center and 320 to 345 Brinell around the edges. The room temperature tensile properties were determined from specimens taken from this slab and are presented in Table I. Also included in Table I are the average tensile properties of the oil-quenched and interrupted-quench disks. The normalized specimens were from 10 to 40 points Brinell harder than the interrupted-quench specimens, and 50 to 75 points harder than the oil-quenched specimens, with correspondingly higher tensile strengths and lower ductility values. The average proportional limit for the normalized specimens (42,750 psi) was much lower than the proportional limit of either the oil-quenched (76,500 psi) or interrupted-quench (61,750 psi) specimens. One center specimen had only 6.5 -percent elongation and 9.3-percent reduction of area. Rupture testing of specimens taken from the rim material of the disks is now in progress at 10000F, and the results obtained to date are shown in Table II and figures 2 and 3. Also included in figures 2 and 3 are rupture data and total deformation data obtained at 11000F, whichwere reported in the Fourth Progress Report dated 31 December 1951. Table III shows the high-temperature strengths of the three 4340 disks at 1000~ and 1100~F and the results obtained in the

5 isothermal transformation study. A study of the microstructures involved is now in progress in order to try to explain the results obtained. Selection of one of the h3h40 disks for further testing at 1200~F has been withheld pending a decision of representatives of the Materials Laboratory on this question, after consideration of the data obtained to date. The following facts should be noted: (1) Disk #3 (OQ. + T.) had poor high-temperature properties at 1000~ and 1100 ~F. (2) Disk #4 (I.Q. + T.) and disk #1 (N.) had similar high-temperature properties at 1000 and 1100 ~F. (3) Disk #1 (N.) had not been tempered. (4) The practicability of the heat treatment used on disk #4 (I.Q. + T.) has made the value of additional data on this disk questionable. "17-22AtS STEEL The results of the survey at 11000F of the high-temperature properties of the three '17-22A"S disks have been reported in the Fourth Progress Report. The 1000-hour rupture strengths were as follows: Disk 1000-Hour Rupture Strengths Number (psi) 1 (N.) 14,500 3 (O.Q.) 18,500 4 (I.Q.) 21,500 Although the interrupted-quench disk had slightly better properties than the oil-quenched disk, the difference was not great enough to warrant further testing of that disk, considering the practical aspects of the heat treatments involved. Therefore, the oil-quenched disk was selected for further testing at 10000, 1100~, and 1200~F. The low strength of the normalized disk was due to the fact that the disk did not harden upon normalizing. Metallographic examination of a section

6 3/4-inch from the surface of the disk and of a completed rupture test specimen showed large amounts of ferrite and pearlite present, plus a tempered constituent (either bainite or martensite). The design data obtained to date at 1100~F for the oil-quenched disk are shown in Table IV and figure 4. To date, no results have been obtained at either 10000 or 1200~F. Table V shows the high-temperature strengths at 11000F for the three "17-22A"S disks and the results obtained in the isothermal transformation study. A study of the microstructures involved is now in progress in order to try to explain the results obtained. H-40 STEEL The room temperature tensile properties of the normalized and interruptedquench disks are shown in Table VI. Also included are the average tensile properties of the oil-quenched disk which were reported in the Fourth Progress Report. All three materials had hardnesses of about 350 to 360 Brinell with correspondingly high tensile strengths and low ductility values. The specimens taken directly from the center average about l-percent elongation for all three materials, although values as low as 1- to 2-percent were obtained in each. The survey at 1100~F of the three disks has been completed and the results are shown in Table VII and figure 5. All three disks had similar high-temperature strengths. They all had high Brinell hardnesses, and they all showed low, erratic ductility values in the rupture test. Because of these facts, no further testing is planned in the immediate future for any of the three disks.

7 The stresses to cause 1-percent total deformation in 1000 hours at 1100~F for the bar stock and disk material are as follows: Stress to Cause 1% Total Deformation in 1000 Hours at 1100~F Material (psi) Disk #1 (N. + T.) 29,500 Bar Stock - N. 1950~F + T. 18 Hrs. at 1200~F 27,750 Disk #3 (O.Q. + T.) 35,250 Bar Stock - O.Q. 1950~F + T. 12 Hrs. at 1200~F 23,300 Disk #h (I.Q. + T.) 32,200 Bar Stock - Aust. 1950~F + 10 Hrs. at 750~F + 21,500 T. 1 Hr. at 1300~F A study of the microstructures involved is now in progress in order to try to explain the results obtained. C-422 STEEL The normalized and tempered and oil-quenched and tempered disks have been split and the center slabs cut out. These slabs have been magnafluxed and macroetched. The normalized and tempered disk showed two small indications of defects on magnafluxing. These indications also appeared on macroetching. The slab cut from the oil-quenched and tempered disk was found to be sound. Brinell hardness surveys were taken on the slabs from both disks and these are shown in figures 6 and 7. Both disks showed a hardness range of about 280 to 320. The oil-quenched and tempered disk showed one small hard area near the surface where the hardness ranged from 320 to 350 Brinell. The room temperature tensile properties of both disks were determined from specimens cut from the center slabs, and these properties are shown in Table VIII. Both disks exhibited similar room temperature tensile properties. All four specimens taken from the center of the normalized disk and two of those from the oil-quenched disk had low ductility,

8 The results of the survey of rupture properties at 11000F are shown in figure 8 and Table IX. The oil-quenched and tempered disk had somewhat better properties and was selected for further testing at 1000~, 1100~, and 1200~F. Design data obtained to date at 10000, 1100l, and 1200~F for the oilquenched and tempered disk are shown in figure 9 and Tables IX and X. Also included in Table X are data obtained for the normalized and tempered disk at 11000F and results obtained from tests on similarly treated bar stock. The data obtained from the bar stock shows reasonable agreement with the data obtained from the disk study. A study of the microstructures involved is now in progress to try to explain the results obtained. Investigation of the Properties of the Products of Isothermal Transformation All creep testing at 1100~F of isothermal structures of 340O, "17-22A"S, H-hO, and C-422 steels as outlined in the First Progress Report has been completed. The microstructures of the isothermally transformed materials are being examined metallographically in conjunction with the disk materials in an attempt to correlate the data obtained by creep and rupture testing. 4h30 STEEL AND C-422 STEEL The creep test results obtained at 1000~ and 1100~F for h3h0 and at 1100~F for C-422 have been reported in the Third and Fourth Progress Reports. '17-22A'IS STEEL The last creep test at 11000F and 15,500 psi on an intermediate structure developed by isothermally transforming for 2 hours at 9000F and then tempering at 12000F for 16 hours, with a Brinell hardness of 317, has been completed with the following results:

9 IMiiu Total Def ormation Time f or 1% Creep Rate in 1000 Hours Total Deformation (%/l000 Hrs.) (% (Hours) 0.94 1.34 798 The results obtained from creep-rupture tests at 11000F are as follows: Stress to Cause 1% Total Deformation 'in 1000 Hours Heat Treatment BHN (psi) (50oF + T. 10 Hrs. at 12000F 291/317 193,000 175o0F + T. 1 Hr. at 13000F 302/306 l5,000 175o F + l-1 Hrs. at 1350*F 309/313 16,000 l 7500F + 10 Hrs. at 11500F + 291/313 less than l5,000 N. 17 0.Q. Aust. Aust. T. 12 Hrs. at 12000F Aust. 17500F + 2 Hrs. at 9000F + T. 16 Hrs. at 12000F Aust. 175o0F + 5 Min. at 700*F + T. 12 Hrs. at 1200'F 317/327 302/303 lh4,000 l1,500 H-ho STEEL The last creep test at 11000F and 23,000 psi on an intermediate or bainitictype structure with a Brinell hardness of 312 has been completed -with the following results: Minimum Creep Rate (%/l000 Hrs.) 0.76 Total Def ormation in 1000 Hours (% 1.23 The results obtained from creep-rupture tests Time for 1% Total Deformation (Hours) 843 at 11000F are as follows:, Stress to Cause 1% Total Deformation in 1000 Hours (Psi) 27,800 23,000 21, 500 Heat Treatment N. 1950*F + T. 18 Hrs. at 12000F 0.Q. 19500F + T. 12 Hrs. at 12000F Aust. 19500F + 10 Hrs. at 7500F + T. 1 Hr.. at 13000*F (Bainite) BHN 312/320 32 1/3 23 308/312

10 FUTURE WORK Creep-rupture testing of t17-22A"S disk #3 (O.Q.) and C-422 disk #4 (O.Q.) will be continued in order to accumulate additional design data. No further testing is planned in the immediate future for any of the H-O40 disks because of their high hardness and low, erratic ductility in the rupture test. Further testing of the h3h0 disk material at 12000F will not be undertaken pending the decision of the Materials Laboratory on this matter. A correlative study of the microstructures of the disks and isothermally transformed structures of bar stock is now in progress and should be finished in the next period. A limited amount of rupture testing of the isothermally transformed structures is planned to aid in this correlative study.

TABLE I ROOM TEMPERATURE TENSILE PROPERTIES AT THE CENTER OF THE h3Lo DISKS Specimen Number 1W 1X 2W 2X 2Y 2Z Specimen Location (a) Disk #1 - SRR CRR SRC CRC CRC SRC Tensile Offset Yield Strengths Strength (psi) (psi) 0.02%. 0.1% 0.2% Heat Treatment: First treatment - N. ] Second treatment - N. 3 163,500 69,500 97,000 112,000 163,500 72,000 102,500 119,000 156,500 62,000 92,000 106,500 155,000 58,500 87,000 101,500 155,250 70,500 96,500 110,000 151,000 65,250 92,500 105,500 46,000 43,000 37,000 0o,000 46,000 44,000 from 17500F from 15509F 75,500 77,500 17500~F + T. 63,750 60,000 15.0 12.5 6.5 10.5 12.0 11.5 Proportional Elongation Limit in 2 in: (psi) ( L750~F + T. 2 Hrs. at 1200~F L750~F Reduction of Area (%) 45.5 o0.3 9.3 25.5 32.8 30.2 Brinell Hardness 328 331 316 316 308 30o 276 257 288 289 Disk RR RC Disk RR RC #3 - Heat Treatment: First treatment - O.Q. Second treatment - O.Q. 132,750 109,750 112,500 113,250 124,000 92,500 95,750 96,250 #4 - Heat Treatment: Interrupted-quench from 140,700 88,750 103,000 107,750 137,500 85,500 99,500 o04,750 + T. 8 Hrs. at 1200~F + Tempered at 1050~F 17.8 6( 17.3 2 Hrs. at 1200~F 17.0 45 12.2 21 ).3 5.0 9.1 7.8 (a) SRR CRR SRC CRC RR RC Surface plane radial specimen near rim of disk Central plane radial specimen near rim of disk Surface plane radial specimen near center of disk Central plane radial specimen near center of disk Radial specimens near rim of disk Radial specimens near center of disk

TABLE II RUPTURE DATA FOR 4340 DISKS AT 10000F Specimen Number Disk Specimen Location (a) #1 - Heat Stress (psi) Treatment', Rupture. Elongation Time in 2 in. (Hours) (%) First treatment - N. Second treatment - N. Reduction of Area (% 175o*F + T. 175o"F Time to Reach 1-Percent Total Deformation (Hours) 2 Hrs. at 1200"F 6w hz 6z Disk #3 - CRR SRR SRR CRR SRR Heat 50,OOO145,000 39,000O 34,OOO 24,000 Treatment: 88() 2.2 1.2 163 2.8 1.08 146 2.7 1.7 292 2.3 4.0. (c) First treatment - 0.Q. from 17500F Second treatment - 0.Q. from 15500F 68 118 122 250 + T. 8 Hrs. at 1200*F + tempered at 1050'F hz.6w 6x 6z Disk hz 6w 6x 6z SRR SRR CFRR CRR SRR #4- Heat SRR SRR CRR CRR SRR 50,000 405000 32,500 27, 500 20,000 Treatment: 50,000 h40,000 34,000 28,000 19,000 23 77 247 372 28.0 16.5 11.,.11.5 48.7 30.8 l14.5 17.8 (c) 2 68 124 + T. 2 Hrs. at 1200'F 81 140 256 Interrupted-quench 88 2.2 l85 3.1 278 1.8 377 1.8 (c) from 17500F 365 3.5 2.2 2.4 (a) CRR Central plaz SRR Surface plaz (b) Broke in fillet (c) Test in progress ne radial specimen at rim,ne radial specimen at rim

TABLE III COMPARISON OF THE HIGH TEMPERATURE PROPERTIES OF 4340 BAR STOCK AND 4340 DISK MATERIAL Material Heat Treatment Test Temp. ( F)- 1 B Rupture Strengths 10 r 100 r o1000 r Disk #1 (a) N. 1750'F + T. 2 Hrs. at 1200"F (b) N. 1750F 1000 1100 - 8,000 - -36,000 18, 500 Stress to Cause 1-Percent Total Deformation at Indicated Times 1 Hr 10 100 Hr 00 Hr 1000 Hr 44,500 27,500 21,500* 26,500 13,000 Disk #1 (a) N. 1750'F + T. 2 Hms. at 1200~F (b) N. 17'50F Bar Stock: N. 175Q~F + T. 1 Hr. 10 - - 8, 15,0 at 1100~F Bar Stock N. 1750~F + T. 1 Hr. 1100 - 7,,400 5,250 -at 1100*F!Disk #3 (a).Q 1750F + T. 1000 - 58,000 38,000 - 5,500 39,5 241,500 14,250 8- Hrs. at 1200:F (b):o.Q.:55o0F + tempered 1050*F 'Disk #3 (a) OQ. 1750F + T. 1100 - 28,000 15,500 - 29,500 15,750 8,'400 8 Hrs. at 1200~F (b) —.Q. 15500F + tempered 1050~F 7:$gock O:4... Q.: -:fT:. 0 - O - - at HOOF Bar-Stock: O.Q. 1750F + T. 10 Hrs. 1100 - - - - - at 1100 pF Disk #4 Int-quench 1750F + 1000 - _ _ Lt6,250 2L-4,00 T. 2 Hrs. at 1200 "F zDisk #4 Int.-quench 175!0~F + 1100 ' 33,500i 9,000. - l,000 2,250: 15,500 T. 2 Hrs. at 1200~F:Ba: Stock Aust. 1750~F + 28 Hrs. 1000 - - - 20,500 at -850~F (Upper Bainite) Bar Stock Aust. 17560"F + 28 Hrs. 1100 - - at 850 *- (Upper Bainite):13,300 b,250 9,750 - 18,2350* 17,300 >4,,250 PI _ _. BI Stock Bat,Stock Aust.: 1750'F + 1-1/2 Hrs. 1000 at 650*F + T. -1/4 Hrs. at 1100~F (Lower Bainite) 13,000 Aust. 1750F + 1-1/2 Hrs. 1100 at 6'6~F + T. 1-1/4 Hrs.:at:'1100~F:(Lower Bainite), 5oo0 * Etrapolation based on data obtained to date.

TABLE IV CREEP-RUPTURE DATA FOR DISK #3 OF "17-22A"S STEEL AT 1100~F Heat Treatment: O.Q. 1750~F + T. 8 Hrs. at 1200~F Specimen Specimen Number Location (a) Stress Time to Fracture (psi) (Hours) h7,500 51 Reduction of Area (%) 5.1 Elongation in 2 in. 2.6 Time to Reach Specified Total Deformations (Hours) 0.1%.02% 0.5% 1.0% Time at Start of Third Stage Creep (Hours) 20 4z SRR (b) (b) 6 29 4x 4w 6w 6X CRR SRR CRR SRR CRR CRR SRR 42,500 38,500 32,500 25,000 20,500 15,500 12,500 94 86(c) 219 489 792 8.2 3.5 1.6 3.2 2.8 3.5 3.0 3.0 2.6 1.7 (b) (b) 10 47 (b) (b) 1 19 45 2 49 156 116 280 48 (b) 21 199 402 3 57 441 5 109 774 (d) 6Z (d) 26 (a) SRR Surface plane radial CRR Central plane radial specimen near rim specimen near rim (b) (c) (d) Test specimens reached this deformation Broke in gage mark Creep tests in progress on loading

Materi TABLE V COMPARISON OF THE HIGH TEMPERATURE PROPERTIES OF "17-22A"S BAR STOCK AND t117-22Af"S DISK MATERIAL AT 1100~F Stress to Cause 1-Percent Total al Heat Treatment Rupture Strengths Deformation at Indicated Times (psi).(psi) 1 Hr 10 Hr 100 Hr 100 r H r 10 r 100 Hr 500Hr 1000 Hr 1 N. 1750~F + T. 2 Hrs. at 1200~F - 63,000 34,500 14,500 68,000 47,000 31,750 18,250 14,000 ock N. 1750~F + T. 10 Hrs. at 1200F - - - 19,500* - - 2L,000* 20,500 19,000 Disk # Bar St Disk #3 Bar Stock Disk #4 Bar Stock Bar Stock O.Q. 1750~F + T. 8 Hrs. at 1200~F O.Q. 1750~F + T. 1 Hr. at 1300~F I.Q. 1750~F + T. 2 Hrs. at 1200~F Aust. 1750~F + 5 Min. at 700~F + T. 12 Hrs. at 1200~F (Lower Bainite) Aust. 1750~F + 2 Hrs. at 900~F + T. 16 Hrs. at 1200~F (Upper Bainite) - 70,000 40,000 19,500 - - 18,000* - 76,000 1,500 22,500 - - 18,000* 59,500 35,500 23,250 19,000 - 24,500* 18,250 15,000 56,000 36,000 24,750 - 21,500* 17,500 20,500 15,5oo 24,750* 17,500 14,000 * Estimated values

TABLE VI ROOM TEMPERATURE TENSILE PROPERTIES AT THE CENTER OF THE H-40 DISKS Specimen Spec Number Locat (a) Disk 1W 2W 2X 2Y 2Z SRR CRR SRC CRC CRC SRC Disk men Tensile Offset Yield Strengths Proportional Elongation ion Strength (psi) Limit in 2 in. (psi) 0.02% 0.1% 0.2% (psi) (%) #1 - Heat Treatment: First treatment - N. 1950~F + T. 2 Hrs. at 1200~F Second treatment - Retempered at 1200~F 1685,00 129,250 147,000 153,500 102,000 12.0 167,500 128,750 145,500 151,750 104,000 11.0 163,250 126,500 1 145,00 000 96,000 1.0 165,500 125,000 1,00 151,70 104,00 1. 169,250 130,500 1h8,000 154,250 105,000 5.0 169,000 129,000 145,750 152,500 10,000 7.0 #3 - Heat Treatment: First treatment - O.Q. 19504F + T. 8 Hrs. at 1200~F Second treatment - Retempered at 1200~F 182,750 138,000 159,500 165,000 110,500 9.7 176,000 127,000 151,750 160,500 98,500 4.h Reduction of Area (%) 40.5 31.2 4e.3 3.9 9.6 13.4 23.6 7.4 + T. 1200~F 33.7 23. 1.2 4.7 7.4 19.5 Brinell Hardness 352 350 363 350 356 345 364 353 RR RC Disk #h 1W 2W 2X 2Y 2Z SRR CRR SRC CRC CRC SRC - Heat Treatment: First treatment - Interrupted-quenched from 1950~F Second treatment - Retempered at 1200~F 173,000 133,500 150,000 156,500 108,000 10.5 176,000 130,000 1h9,250 157,750 101,000 10.0 169,250 137,000 157,750 16h,000 109,500 1.5 171,500 129,750 150,250 158,250 102,000 2.0 174,750 131,000 150,750 158,750 101,000 2.5 175,000 129,250 149,000 156,750 102,000 9.0 351 361 357 367 357 355 (a) SRR CRR SRC CRC RR RC Surface plane radial specimen near rim of disk Central plane radial specimen near rim of disk Surface plane radial specimen at center of disk Central plane radial specimen at center of disk Radial specimens at rim of disk Radial specimens at center of disk

T..ABLE VII RUPTURE DATA FOR H-ho DISKS AT 11000F Specimen Number Disk #1 - Specimen Stress Location (a) (pi Heat Treatment:0 Rupture Elongation Time in 2 in. (Hours) (% First treatment - N. Reduction of Area (%) 195o0F + T. Time to Reach 1-Percent Total Deformation (Hours) *0 2 Hrs. at 1200'F 12000F Second treatment - Retempered at Iw hx 14Z 6w 6x Disk #3 6w hw hz SRR 55,0O0 CRR 5500 SRR 5500 CRR h5,000 SRR h5,000 CRR 37,000 - Heat Treatment: 2 8(b) h8 (c) 9 7 l64 (b) 2h2 5l8 1,4 8.3 5.0 SIRR CRR SRR SRR CRR 60,000 50,000 h453ooo 39,000 38,9000 First treatment - Second treatment - 35 2.2 136 1.8 298 1.8 h56(c) - 189(c) - 0.9 1h4.1 h4.0 0.Q. 19500F + Retempered at 2.8 3.9 3.9 ho (d) 97 336 T. 8 Hrs. at 12000F 12000F 455 (d) Disk #h - Heat Treatment:, First treatment - Interrupted-quenched T. 12000F Retempered at 1200'F from 19500F + h.x 6w hw 6x (a) SRR CBRR SRR SRR CRR CRR SRR CRR Surface Second treatment - 60,000 3h (b) - 55,o00 67 1.9 50,00O 108 2.6 h5,000 2h3(c) - hO,000 h57 (b) 39,000 ho?(c) - 35)000 697 2.3 plane radial specimen near r 5.8 8.1 28 73 228 h00 (d) 690 7.0 rim of d isk CRR Central plane radial specimen near rim of disk (b) Broke in th3~eads (c) Broke in fillet (d) Extrapolated value

TABLE VIII ROOM TEMPERATURE TENSILE PROPERTIES AT THE CENTER OF THE C-422 DISKS Specimen Number Disk SpecimE Locatic (a) #4 - Hea 1W IX 2W 2X 2Y 2Z Disk #1 SRR CRR SRC CRC CRC SRC - HeG ~n Tensile )n Strength (psi) it Treatment: 11,500 141,000 135,500 133,000 132,500 130,750 it Treatment: 145,500 145,500 133,500 133,250 135,250 134,000 plane radial plane radial plane radial plane radial Offset Yield Strengths /f-. \ Proportional Limit Elongation in 2 in. 0.02% 0.1% 0o02% ol%..,,...~........ First treatment - Second treatment - 98,500 108,500 96,500 107,500 94,250 10h,000 89,750 101,000 91,000 101,500 86,000 100,000 First treatment - Second treatment - 0.2% (psi) (% (%) ___ O.Q. 1900~F + T. 8 Hrs. at 1200~F Full annealed at 1600~F for 6 Hrs. and furnace cooled. O.Q. 1900~F + double temper at 1200~F for 2 plus 2 Hrs. 113,000 83,000 16.0 40.1 291 112,500 82,500 16.5 37.9 299 108,750 80,000 7.5 8.9 294 106,000 69,000 7.5 13.0 287 105,500 71,000 12.5 30.2 285 10,500 66,000 17.0 41.8 282 N. 1900~F + T. 2 Hrs. at 1200~F Full annealed at 1600~F for 6-Hrs. and furnace cooled. N. 1900~F + double temper at 1200~F for 2 plus 2 Hrs. 122,750 87,500 16.0 35.0 301 118,250 67,000 16.0 33.8 308 107,250 70,500 5.5 7.4 300 107,000 77,000 5.5 8.1 295 110,250 77,000 8.0 12.2 288 109,500 75,500 7.5 22.7 294 Reduction of Area Brinell Hardness 1W SRR IX CRR 2W SRC 2X CRC 2Y CRC 2Z SRC (a) SRR Surface CRR Central SRC Surface CRC Central 105,500 95,000 88,500 92,250 93,250 94,000 117,250 112,500 102,500 102,250 104,750 105,250 specimen near rim of disk specimen near rim of disk specimen at center of disk specimen at center of disk

TABLE IX HIGH TEMPERATURE RUPTURE PROPERTIES OF DISKS #1 AND #4 OF C-422 STEEL Specimen Number Disk #1 - 4W 4X 4Y 4Z Specimen Stress Rupture Elongation Location Time in 2 in. (a) (psi) (Hours) (%) A. Creep-Rupture Properties of the Heat Treatment: First treatment - N. 1900~F + Second treatment - Full anneal N. 1900~F + SRR 55,000 2 26.5 CRR 45,000 15 23.5 CRR 35,000 318 15.0 SRR 32,000 1055 9.5 Time to Reach Reduction Specified Total Deformations of Area (Hours) (%) 0.1% 0.2% 0.5% 1.0% C-422 Disks at 1100~F T. 2 Hrs. at 1200~F 6 Hrs. at 1600~F, furnace cooled. double temper at 12000F for 2 plus 2 Hrs. 69.5 (b) (b) (b) 73.0 (b) (b) (b) 1 36.3 (b) (b) 4 26 20o4 (b) 1 45 225 Disk #4 - Heat Treatment: First treatment Second treatment hw 4Z 4x 4Y lOW 6X SRR SRR CRR CRR SRR CRR 50,000 4L,000 40,000 35,000 28,000 22,000 14 81 399 1001 (c) (c) - O.Q. 1900~F + T. 8 Hrs. at 1200~F - Full anneal 6 Hrs. at 1600~F, furnace cooled. O.Q. 1900~F + double temper at 1200~F of 2 plus 2 Hrs. 36.0 80.5 (b) (b) 0.2 1 28.0 77.0 - - - 29.5 69.3 (b) (b) 2 19 14.5 56.9 (b) 1 16 234 (b) 4 1 58 Continued on next page

Specimen Number Specimen Location (a) Stress Rupture Time (psi) (Hours) Elongation in 2 in.. () Reduction of Area (%) Time to Reach Specified Total Deformations (Hours ) 0,1% 0.2% 0.5% 1.0% 9W 9X 9Y lOX SRR CRR CRR CRR B. Creep-Rupture Properties of 67,500 12 26.0 62,000 72 15.0 58,000 116 21.5 54,000 (d) - C. Creep-Rupture Properties of 45,000 0.2 31.5 30,000 15 26.0 25,000 53 28.5 20,000 134 18.0 C-422 Disk #4 at 70.4 64.0 68.5 C-422 Disk #4 at 81.0 74.3 77.0 65..8 1000 oF (b) (b) (b) (b) 1200 ~F (b) (b) (b) (b) (b) (b) (b) (b) (b) (b) 0.3 5 0.2 1 8 (b) 0.9 8.4 25 1.1l 8 208 4.2 19.6 50 6T 6Z 9W 9Z CRR SRR SRR SRR (a) (b) (c) (d) SRR Surface plane radial specimen near rim of disk CRR Central plane radial specimen near rim of disk Test specimens reached this deformationon loading Creep tests in progress Rupture test in progress

TABLE X HIGH TEMPERATURE CREEP-RUPTURE PROPERTIES OF C-422 DISK MATERIAL AND BAR STOCK AT 1100~F Material,Hata Treatmeant Stress to Cause Rupture at Indicated Times ________(psi) ___ 1 Hr 10 Hr 100 1000 Hr Stress to Cause l-Percent Total Deformation at Indicated Times __(psi)_ 1 Hr 1 0 Hr l0Hr 00 Hr 1000 Hr D isk #1 N. 190~F + T. 2 frs. at 12000F. 579500 47,000 F'all aiaeal 6 HIrs.:at " F I>OF, 'N. 1900"F + T. 12 00: F for 2 + 2 irs. 38,750 32,000 44,500 38,750 33,500 30,500 29,000 Bar Stock N. 1i900*F + T. 2i4 H}rs. at '1200 F 34,9000 - 36,500 31,000 28,750 Disk O.Q. i90Q0F + T. 8 ~.Hrs ~;-at 12O00 ~F -.Fal aM.ea 6 Ers. ait 160'"F,.Q. 1900 ' + T- 1200OF for 2 +.2 Hr.s. 50,500 43,750 35,000 49,500 42,500 36,750 33,000 32,000 Bar Stock O.Q iB OOF + T rs. at' 1200"F - 30)000

) 4) ) (I) (D (D D).) ) 0 0 ) 0 0 0 0 0 0 0 0 0 0 0D 0 00 0000)000000 0 0 0.... 0 0.. O -.,,.. ( o o 0 0 0 0 0 ( 0 0 0 0 0 0 0 00000 0 (00000 00 0 0 0 0 (I 00 0 O Q3 O O O O 6 ^O O O ~O o o @ O O O O 0 00 0 0 000 (D 0 0 (0 0 0 0 ' 0) 0 00000 0 (! ( 00D o0 o o 0. -Q) / -I%. I 0 = 297-320 Brinell Hardness 0 = 321-345 n Heat Treatment: First treatment - N. 17500F + 2 Hrs. at 1200~F Second treatment - N. 1750~F Figure 1. Brirell Hardness Survey on Center Section (1-2-3) of Disk #1 of h340 Steel. -- -

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00 0 0 000 0o 0 0 0 0 0 0 0 00 0 0000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0000000000 00 0 0 O 0 0000000000.00 0 0 0 00Q (D 0 00 0 0 0 0 0000000000000000000000 0 0000000000 00 0 0 0 00000 0 00 0 0 0000 0 00 0 00 00 0 0 = 275-320 Brinell Hardness 0 = 321-352 " Heat Treatment: First treatment - O.Q. 1900~F + 8 Hrs. at 1200~F Second treatment - Full anneal 6 Hrs. at 1600~F, furnace cool. O.Q. 1900~F + double temper at 1200~F for 2 + 2 Hrs. Figure 6. - Brinell Hardness Survey on Center Section (1-2-3) of Disk #4 of C-422 Steel.

00 0 00000 0 0 0 0 000 0 0000000000000000000 00 o 00 0 00000 0 0 0 00000 0 0000000000000000000 00, o o o o o o oo 0 00000000000000000 0 0 0 00000 0 00 0 0000000000000000 0 0 0 00000 0 00 0 0 0 00000 000 0 ~~O. 0/ / /"'~o o o 0D = 266 Brinell Hardness o = 283-323 Brinell Hardness Heat Treatment: First treatment - N. 1900"F + 2 Hrs. at 1200~F Second treatment - Full anneal 6 Hrs. at 1600~F, furnace cool. N. 1900~F + double temper at 1200~F for 2 + 2 Hrs. Figure 7. - Brinell Hardness Survey oh Center Section (1-2-3) of Disk #1 of C-422 Steel.,_ -

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