SIXTH PROGRESS REPORT TO MATERIALS LABORATORY, WRIGHT AIR DEVELOPMENT CENTER DEPARTME~NT OF THE AIR FORCE ON F'OUR LOW.-ALLOY STEELS FOR ROTOR DISKS OF GAS TURBINES IN JE~T ENGINES By A. Zonder J. W. Freeman PROJECT NO. M903' AIR FORCE4 CONTRACT NO,: AF33(038)-13496 EXPENDITURE ORDER NO.:- 605-227 SR-7 June 30, 1952

SIXTH PROGRESS REPORT ON FOUR LOW-ALLOY STEELS FOR ROTOR DISKS OF GAS TURBINES IN JET ENGINES SUMMARY This report is the Sixth 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 determine the effect of heat treatment upon 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, and to establish design data for each steel, heat treated to give the best practical properties. A concurrent study of the high temperature properties of the products of isothermal transformation of the four steels is being carried out, utilizing bar stock. The disks which were selected for determination of design data at 1000~, 1100~, and 1200~F were: (a) 4340 - Disk No. 1 (Normalized) (b) "17-22A"S - Disk No. 3 (Oil quenched and tempered) (c) C-422. Disk No. 4 (Oil quenched and tempered) A disk of the H_"40 steel has not been selected for further testing at 1000~, 1100., and 1200~F because all three H-40 disks, in the as-received condition, had high hardness and showed low, erratic ductility values in the rupture test at I100'~F. The Materials Laboratory requested that the disks be retempered to reduce hardness and improve ductility. A survey of the rupture properties of the three disks is- to be carried out at 1100~F on the retempered material.

2 Creep-rupture testing of the 4340, "17-22A"S, and C-422 disks at 1000~, 1100~, and 1200~F has been completed except for one test now in progress on the 4340 material. Included in this testing were check rupture tests run on a tangential specimen and on 0. 250-inch diameter specimens taken radially and as near the rim as possible in one case and the center in the other in order to determine the variation in properties. Also, the tensile properties of these disks hav,e been determined at 1000~, 1100~, and 12000 F. 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 investigation. INTRODUCTION This report covers the progress made between 1 April 1952 and 30 June 1952 on an investigation of 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. The objectives of this investigation are to determine the effect of heat treatment upon the high temperature properties of each of these four steels and to obtain design data at 1000~, 1100~, and I200~F for the heat-treated disk showing the best practical properties. As a further clarification of the effect of heat treatment upon the high temperature properties of these steels, a concurrent study of the creeps rupture properties of the products of isothermal transformation is being carried out, utilizing bar stock.

3 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. In each case the data are presented factually without any discussion. Correlation work.now in progress will permit proper interpretation of the significance of the data. Disk Investigation 434.0 STEEL All creep-rupture testing at 1000~, 1100~. and 1200~F has been completed except for one test now in progress on the normalized disk material. The normalized disk was selected for testing -at 1200~F because it exhibited the best practical properties at 1000~F. The rupture data obtained at 1000~, 1100~, and 1200~F for th-e normalized disk are shown in Table.I. Also included are the rupture data obtained at 1000~ and 1100~F for the oil-quenched and tempered and interrupted-quench and tempered disks. Figures 1 and 2 show the rupture data and the 1-percent total deformation data obtained at 1000~ and 1100~F for the three disks and at 1200~F for the normalized.disk. Table II shows the high temperature strengths of the disks -at 1000', 1100~, and 1200 ~F and the results obtained in the isothermal transformation.study. The tensile properties of the normalized.disk (disk No. 1) at 1000~, 1100~, and.1200~F are shown in Table III. Also included are the average room temperature tensile properties of the normalized material. Figures 3-6 show a summary of the properties of disk No. 1. Figure 6 also shows the creep rate curves for disks No. 3 and 4 at 1000~ and 1100~F.

4 "17-22A"S STEEL The creep-rupture testing of disk No. 3 (oil quenched and tempered) at 1000~, 1100~, and 1200~F has been completed. The data, including the total deformation values, are shown in Table IV and figure 7. The high temperature strengths of disk No. 3 at 1000~, 1100~, and 1200~F are shown in Table V. Also included are the high temperature strengths of disks No. 1 (normalized and tempered) and 4 (interrupted-quench and tempered) at 1100~F, and the results obtained in the isothermal transformation study. Table VI shows the total deformation and creep strengths of "17-Z2A"S disk No. 3 at 110 0~F. The tensile properties of disk No. 3 have been determined at 1000~, 1100~, and 1200~F and are shown in Table VII. Also included are the average room temperature tensile properties. Figures 8-11 show a summary of the properties of disk No. 3. H-40 STEEL Because the as-received disks had high hardness and showed low., erratic ductility values in the rupture test at 1100'~F, it was decided to retemper material from each disk to a hardness.of 300 Brinell and to conduct a survey of the rupture properties of each retempered material at 1100~F. Material from each disk was retempered for 4 hours at 12500~F with the following resulting hardness values: Disk No. Heat Treatment Brinell Hardness 1 (a) N. 1950~F+ T. 2 Hrs. at 1200~F (b) T. at 1200~F 315/380 (c) T. 4 Hrs. at 1250~F 287/303 3 (a) O. Q. 1950~F + T. 8.Hrs. at 1200~F (b) T. at 1200~F 315/390 (c) T. 4 Hrs. at 1250~F 2.95/317

5 Disk No. Heat Treatment Brinell Hardness 4 (a) I. Q. 1950~F + T. 2 Hrs. at 1200~F (b) T. at 1200~F 327/393 (c) T. 4 Hrs. at 1250~F 287/311 The rupture data obtained to date on the retempered materials are shown in Table VIII. C-422 STEEL The creep-rupture testing of disk No. 4 (oil quenched and tempered) at 1000~, 1100~, and 1200~F has been completed. The data are shown in Table IX and figure 12. The high temperature strengths of C-422 disks No. 1 and 4 are shown in Table X. Also included are data obtained from the isothermal transformation study. Table XI shows the total deformation and creep strengths of C-422 disk No. 4at 1100~F. The tensile properties of disk No. 4 have been determined at 1000~, 1100~, and 1200~ F and are shown in Table XII. Also included are the average room temperature tensile properties. Figures 13-16 show a summary of the properties of disk No. 4.. Investigation of the Properties of the Products of Isothermal Transformation Work on the isothermally transformed bar stock has been confined to examination of the microstructures in conjunction with the mi "0structures of the disk materials in an attempt to correlate the results of the two inve stigations.

6 FUTURE WORK 'Th~e rupture testing.-of the retempered -H-4.0 materials at 11000OF will be c~ontinued in ord-er to-determine the. prprties-~at the lower -hardness,levels. The -results willb~e-submitted for -consideration of the-desirability of collecting additional design data at 1000', i.100', and 12000'F -for th-e disk with the best-prop-erties,. A correlative study of the- microstructur-es of the disk materials and isothermally transformed bar-stock materials is now in progress.. During the -next period correlations involving relative properties of disks and -bar stock -and the-r-esults -of the microstructural studies will be developed. it now. appears that some additional isothermal work -and extension of the test data to.-include rupture. properties of isothermally transformed -structures may. be desirable. Attention i's.directed to -the possibility of issuing. a factual final report at this -time covering the properties of the 4.340,."17 -2ZA" S, and -C-.42 Z disks. If the Materials. Laboratory feels this to be desirable, such -a report- could.be prepared ~during the -next period.

Table I Rupture Test Data for 4340 Disks at 1000~, 11Q0~ and 1200~F Spec. No. 1OW 4Y 6W 4Z 6Y 9Z 7A(b) 5A(b) 6Z 14W 9X 6X 4W Specimen, Location (a) SRR CRR SRR SRR CRR SRR SRR SRC SRR STR CRR CRR SRR Time.at Time to Reach Transition Test Rupture Elongation Reduction 1-Percent Total to Third Temp. Stress Time in 2 in. of Area Deformation Stage Creep (F) (psi) *(hrs.) {%) (%) (hrs.) (hrs.) Disk No. 1. H6at T-reatment: First treatment N. 1750'F + T. 2 Hrs. at 1200~F Second treatment - N. 1750'~F 1000 65,9000 35 3.5 5.9 13 20 i 000 50,000 88(c) 2. 2 1.2 68 63 1000 45,000 163 2.8 1.8 118 95 1000 39,000 146 2.7 1.7 122 98 1000 34,000 292 2. 3 4.0 250 185 1000 34,000 277 2. 2 2. 8 213 170 1000 34,000 165(d) - - 145(h) 140 1000 34, 000 200 4.2 4.0 180 170 1000 24,000 957 3.3 1.3 683 390 1000 24,000 (e) - - Minir-nm Creep Rate (%o /hbor) 0. 0055 0. 005 0. 0045 0. 0025 0. 0033 0. 0045 0. 0037 0. 00086 0. 0365 0. 035 1100 1100 1100 44,000 25,000 20, 000 3. 9 37(f) 67 6. 8 5. 5 6. 2 12. 0 7. 8 7. 0 0. 8 12 22 5 17 4X CRR 1100 17,000 130 5. 3 3. 9 41 64 Continued on next page 0. 0186

Table I (continued) Spec. Specimen Test Rupture Elongation Reduction No. Location Temp. Stress Time in 2 in. of Area ~(a) (F) (psi) (hrs.) (%) Disk No. 1 (concluded) 9Y CRR 1200 209000 2.5 15. 0 19.1 IOY CRR 1200 14,000 12(f) 20.0 14.9 10X CRR 1200 8,000 139 27.5 25.5 10Z SRR 1200 7,000 157(g) 30.0 - Tirne to Reach 1-Percent Total Deformation (hrs. ) Time at Transition to Third Stage Creep (hrs.) Minimum Creep Rate (%/hour) 0.25 3. 3 14 Disk No. 3. Heat Treatment: First treatment - 0. Q. 1750~F + T. 8 Hrs. at 1200~F Second treatment - 0. Q. 1550~F + T. at 1050~F 4Z 6W 6X 6Y 6Z 4W 4X 4Y SRR SRR CRR CRR SRR SRR CRR CRR 1000 1000 1000 1000 1000 1100 1100 1100 50,000 40,000 32, 500 27,500 20,000 25,000 20, 000 13, 000 23 77 247 372 604 28. 0 16.5 11.5 11. 5 14. 0 48. 7 30. 8 14. 5 17. 8 26. 8 39. 1 34.4 41.0 2 8. 5 40 68 124 68 11 0 120 0. 0194 0. 0095 0. 0055 0.017 17 31 212 20. 5 23.0 57.0 2(h) 2. 6(h) 20 73 Concluded on next page

Table I (concluded) Spec. Specimen No. Location (a) Test Temp. ( F) Stress (psi) Rupture Time (hrs.) Elongation in 2 in. Reduction of Area (%) l, _ _.._ Time to Reach 1-Percent Total Deformation (hrs..) Time at Transition to Third Stage Creep (hrs.) Minimum Creep Rate (%l/hour) Disk No. 4. Heat Treatment: Interruptedquench from 1750~F + T. 2 Hrs. at 1200~F 4Z 6W 6X 6Y 6Z 4X 4W 4Y SRR 1.000 50 000 88 SRR 1000 40,000 185 Z. 2 3. 1 1. 8 1. 8 3.5 3.5 2.2 2.4 CRR 1000 34,000 278 81 140 256 355 1228(h) 63 120 150 210 960 0. 0076 0. 005 0. 0024 0. 0018 0. 0006 CRR 1000 28, 000 377 SRR CRR SRR CRR 1000 1100 1100 19,000 (i) 30,000 25,000 17 29 3.5 4.7 5.6 5.9 8. 1 7.0 4 11.2 19 0. 066 0.011 1100 16,000 199 84 90 (a) SRR Surface plane radial specimen at rim of disk CRR Central plane radial specimen at rim of disk.SRC Surface plane radial specimen at center of disk STR Surface plane tangential specimen at rim of disk (b) 0. 250-inch diameter specimens (c) Broke in fillet (d) Broke in threads (e) Test in progress (f) Broke in gage -mark (g) Badly scaled (h) Extrapolated.value (i) Test discontinued at 1150 hours

Table II High Temperature Strengths of 4340 Bar Stock and 4340 Disk Material Material Disk No. 1 Heat Treatment (a)N. 1750~F + T. 2 Hrs. at 1200~F (b) N. 1750~F Test Temp. (OF) 1000 1100 'I1 <^ 1 0 Rupture, Strengths (psi) 1 hr 10 hr - 97,9000 71, 000 36,000 100 hr 1000hr 1 hr 10 hr.....,,... ~..,., 48,000 18,000 AT 0 AIN 23, 500 Stress to Cause 1-Percent Total Deformation at Indicated Times (psi) 92,000* 66,000 43,000* 2-6, 000 i L rI f t fI ^ _ % 4 100hr 500 hr 1000hr 16,000 26,250 20,500 13,000 i r\ 0^^ lA-UU,, UUU,OUU 1UU UU (yUU - l.QUU.,sUU, UU Bar Stock N. 1750F + T. Hr. 1000 - -18,500 15,500 at 1100FF 1100 7,400 5,250 DiskNo. 3 (a) O.Q. 1750~F+T. 1000 58,000 38,000 15,500 56,000 39,500 23,000 13,000 8 Hrs. at 1200~F (b)O.Q. 1550~F+T. 1102 1,00 25 5 0 8,00 8,00 15,500 - 500 15750 8400 5 at 1050'0F Bar Stock O.Q. 1750'F + T. 1000. ---lOHrs. at 1100F 1100 - -.. - DiskNo. 4 Int. -quench 1750~F 1000 - 90,000 48,000 Z200 - - 46,250 26,500 +T. ZHrs. atlZ200~F 1100. 33,750 19,000 - 40,000 25,000 15,500 11,500' BarStock Aust. 1750~F 1 000 - - - - - - - 20,500 28 Hrs. at 850 'F (Upper Bainite) 1100 _ -. - - - - BarStock Aust. 17500F+1-1/2 1000 -.. gr air.L / P A.At,l mql 13 300 4,250 10,000 4,400* 11,500 < 4,500 2.1, 000 F 10,000* 17,300 >4, 250 13,000 Hirs. at65 0'F+ T. 1-1/4 Hrs. at 11001~F (Lower Bainite) 1100 < 4,500 * Extrapolated value

Table HI Short Time Tensile Properties of 4340 Disk No. 1 Heat Treatment: First treatment - N. 1750~F + T. 2 Hrs. at 1200~F Second treatment - N. 175.0F Specimen Specimen Number Location _______ (a) _ RR -RC 1Y 3W 14Z 3X 1Z 14Y 3Z 3Y IX CRR SRR STR CRR SRR CTR SRR CRR CRR Test Temp. (~F) Room Room 1000 1000 1000 1100 1100 1100 1200 1200 1200 Tensile Strength (psi) 163, 500 154, 500 99, 000 98, 750 100,000 71, 500 64,250 72, 500 38,000 38, 500 34,500 0. 02% 70, 750 64,000 56,500 65,500 57, 250 46,750 34,000 31,000 11,750 15,500 15, 500 0. 1% 99, 750 92,000 77,250 80,250 77,500 57,000 51, 000 47,250 23, 750 24, 50'0 22,750 Offset Yield Strengths (psi) 0.2% 115, 500 106,000 86,500 87,500 85, 750 64,.000 57,750 58,000 29,000 31,000 27,500 Proportional Limit (psi) 44,500 41,750 46,000 48,000 37,500 25,000 18,500 19, 500 10, 000 9,000 8,500 Elongation in 2.in. (%) 13.8 10.1 16.0 21.0 16.0 14.0 24.5 14.0 25. 0 30. 5 30.5 Reduction of Area (%) 42. 9 24. 5 48. 7 58.5 44. 8 35. 0 56.8 26. 7 41. 3 37. 0 28. 8 (a) RR RC CRR SRR STR CTR Radial specimens at rim of disk Radial specimens at center of disk Central plane radial specimen at rim of disk Surface plane radial specimen at rim of disk Surface plane tangential specimen at rim of disk Central plane tangential specimen at rim of disk

Table IV Creep-Rupture Properties of "17-22A"S Disk No. 3 at OOO, 1100~, and 200ZOO~F Heat Treatment: 0. Q. 1750~F + T. 8 Hrs. at 1200~F Spec. No. 7Z 9Z 7W Specimen Location S(a)R SRR SRRSRR Test Stress Temp. (~F) 1000 1000 1 000 (psi) 90. 000 80,000 70,000 Time to Fracture (hrs. ) 1.8 66 171(b) Elongation in 2 in. 15.0 13.1 5.6 Reduction of Area....%). 67.0 51.0 15.4 Time to Reach Specified Time at Start Total Deformations of Third U(hrs.) Stage Creep O2 -o. 0._5__0 _ 1. 0o (hr,) (c) (c) (c) (c) (c) (c) (c) 1 6 0.2 60 Miimum Creep Rate _(%/hour) 0. 030 0. 009 75 7Y 9X 4Z 4X 4W 4Y 9W 7A(d) 5Atd) 6W 6X 14Z 6y(e) 6Z(e) 9y(e) low 10Y 10X 10Z CR 1000 60, 000 CRR SRR CRR SRR CRR SRR SRR SRC SRR CRR STR CRR SRRK CRR SRR CRPR CRR SRR 1100 1100 1 100 1100 1100 1100 1100 1 100 1-100 1100 1100 1 100 1100 1100 1200 -1200 1200 1200 80,000 47t 500 42, 500 38, 500 32, 500 32s, 500 32t 500 32,500 25, 000 20,500 19,500 15,500 12,500 7, 000 35,500 32,000 22, )00 1t 6,000 487 0.2 51 94 86(b) 2.1.9 219 165 171 244 489 792 1112 off 1120 off 11z0 off 1085 5.2 6, Z 33 73 Z. 5 16.0 o 2.6 3.5 3.0 3.0 3.2 3.0 3.2 Z 2.6 1.7 3.6 I, 7.0 5.5 3.0 1.4 4.5 70.3 5. 1 8.2 3.5 1.6 3. 1 3.2 4.7 3.2 2.8 2.8 8.5 4.8 6.2 4.3 (c) (c) (c) (c) (c) (c) (c) (c) (c) (c) 3 1.5 5 26 630 (c) (c) (C) (c) (c) (c) (c) (c) (C) (c) 21 57 48 109 227 1805(f) (c) (c) 2 92 350 (c) 6 10 19 49 44 Z9 5 199 441 374 896 1210<11 0.4 1 7 19 29 47 45 156 97 98 82 402 774 728 2460(f) 1.9 3 16 38 270,m, 20 48 116 74 94 140 280 575 380 0.0016 ms 0.0172 0.0135 0.018 O. 0043 0.0065 0. 0068 O. 0057 0. 0015 0. 0008 0.0009 0.00032 0.00032 0.00009 2 3 19 0. 016 (a) SRR C RR SRC S-TR Surface Central Surface Surface plane radial specimen at rim of disk plane radial specimen at rim of disk plane radial specimen at center of disk plane tangential specimen at rim of disk (b) (c) (d) (e) (f) Broke in gage mark Specimen reached this deformation on loading 0. 250-inch diameter specimen Creep test Extrapolated value

High Temperature Strengths of Table V "t17-22A"S Bar Stock and " 17-22A"S Disk Materials Stress to Cause 1-Percent Total Rupture Strengths Deformation at Indicated Times Material Heat Treatment Test Temp. (~F) I hr _. 46 %-P (psi). I — TU-h.r.1 00 hr. 1000 hr 1 hr 10 hr _, _,, 100 hr 500 hr (nsi) 1000hr DiskNo. 1 N.lt3.0F+T. 2 Hrs. 1100 - 63,000 34,500 14,500 68,000 47,000 31,750 18,250 at 1'00~F Bar Stock N. 1750 F + T. 1100 - - 19,500* - 24,000 20,500 lOHrs. at 1200~F... DiskNo.3 O.Q.1750~F+T. 1000 92,500 85,000 75,000 54,000 87,000 80,500 67,500 58,000 8Hrs. at 1200~F 1100 69,000 54,000 41,.000 19.500 64,000 51,000 34,500 23,000 1200 50,000 29,000 14,500 - 41,000 24,250 11,500 BarStock O.Q. 1750~F + T. 1100 - - 18,000* - 24,500* 18,250 1 Hr. at 1300~F Disk No. 4 I.Q. 1750~F + T. 1100 - 69,000 41,500 21,750 - 56,000 36,000 24,750 2 Hrs. at 1200~F Bar Stock Aust. 1750~F+5 Min. 1100 - - - - 21500* 17,500 at700~F+T. 12Hrs. at 1200~F (Lower Bainite) BarStock Aust. 1750~F+22Hrs. 1100 - 18,000* - - 24,750* 17,500 at 900~F +T. 16 IHrs. at 1200~F (Upper Bainite) 14,000 19,000 54,000 19,000 15,000 20,500 15, 500 14,000 * Estimated values

Table VI Time-Deformation and Creep Strengths at 1100~F for "t17-22A"S Disk No. 3 Heat Treatment: 0. Q. 1750~F + T. 8 Hrs. at 1200~F Total Deformation (%) 0.1 0. 2 0. 5 1. 0 Transition Rupture Stress to Cause Total 1 hr 22, 500 37,750 59, 000 64,000 69,000 10 hr 14, 750 27,000 41, 500 51, 000 56, 000 54,000 Deformations at Indicated Times (psi) 100 hr 500 hr l000 hr 9,800 7, 300 6,500 16,000 10,000 8,200 29,000 18,500 15,000 34,500 23,000 19,000 31,500 21,500 18,000 41,000 24, 500 19,500 Creep Strength (psi) 0. 0001%/hour 0. 001%/hour 7,200 21,750

Table VII Short Time Tensile Properties of "17-22A"S Disk No. 3 Heat Treatment: O. Q. 1750~F + T. 8 Hrs. at UZ00F. Specimen Number 14X 3W 3X 14Y 1Z 1Y Specimen Lo-cation (a) RR RC CTR SRR CRR 'CTR SRR CRR Test Temp. (~F) Room Room 1000 1000 1000 1100 1100 1100 Tensile Strength (psi) 148, 000 145,250 97,500 96,250 96,50C 83,500 90,500 83,200 Offset Yield Strengths (psi) 0. 02% 123, 250 120, 500 65, 000 64, 500 72,500 49, 500 48,500 46,000 0. 1% 131, 250 126,000 83,000 83,250 84,750 68,250 65,250 67, 000 0.2%0 133,500 128,500 90,000 89,000 90,000 76,000 72,000 74,250 Proportional Limit (psi) 93, 500 104,500 38,500 45,500 50,000 24,500 29, 000 25,000 Elongation in 2 in. (%) 17. 2 13.9 21. 5 23. 0 26. 0 27. 0 29. 5 23. 5 Reduction of Area (%) 53. 6 35. 1 71. 0 73. 0 72.5 72. 5 71. 6 73. 5 3Y 3Z14W CRR 1200 62,500 32,000 46,7! SRR 1200 63,000 28, 500 44,50 STR 1200 62,500 33,500 44, 0( Radial specimens at rim -of disk Radial specimens at center of disk Central plane tangential specimen at rim of disk Surface plane radial specimen at rim of disk Central plane radial specimen at rim of disk Surface plane tangential specimen at rim of disk 50 )O0 00 54,000 51,000 54,000 16,000 12, 500 19,000 24. 0 22. 5 22. 0 44.8 48. 3 41.6 (a) RR RC CTR SRR CRR STR

Table VIII Rupture Data for R~etemper ed H-.40 Disk Material at I11000'F Specimnie Specim~en Stress Rupture Number Location Time ______ (a) (psi) (hr s.) Elongation in.2 in. Reducfion of.Ar ea (%0) Time -to Reach 1 -Per cent Total Deformnat~ion (hr s. ) Disk No. 1. Heat Treatment: First treatment -N.,1950'F +T. 2. Ers. Second treatment T.. at 1-200OF Third treatment -T. 4 -Hrs. at 12500 F at 12000F.0. 5 10. 7 9W 9X. SRR.60, 000 2. 7 10. 5 3. 0 37. 4 7. 8 CRR 5,0,000 43-;(b) 9y CRR 459000 81 2. 7 6. 2 53 Disk No. 3. Heat Treatment: First treatment - O.Q'. 1950'F + T. 8 Hrs. Second treatment - T.. at 1200'F Third treatment. - T.. 4 Hrs. at 1250'F at 1200'F 9W 9y SRR 60,000 10 17. 0 8. 0 50. 0 22. 0 1.4 23 CRR 50,000 80 Disk No. 4. 9W Heat Treatment: First treatment -I. Q.. 1950'F +T. 2 Hrs..Second treatment - T. at 1200'F Third treatment- T. 4.Hrs. at 12500 F at 1200'F 0. 8 SRR 60, 000 2. 9 10. 5 40. 2 9X CRR 509000 70 4. 5 8. 2 26 (a) SRR Surface plane radial specimen at rim CRR Central plane. radial specimen at rim (b) Broke in gage mark

Table IX Creep-Rupture Properties of C-422 Disk No. 4 at 1000~, 1100~, and 120O~F Heat Treatment: First Treatment - O. Q 1900~F + T. 8 Mrs. at 1200~F Second Treatment - Full anneal 6 Hrs. at 160-0~F. O. Q!900~F + T. at 1200~F for 2 + 2 Mr 8. Szpec. iqo. 9W 9x 9Y 10X Specirnen.Loc ation (a) SRR CRR CRR C RPJ Te st Temp. (CF) 1000 1000 1000 1000O Stress (psi) 67,500 62, 000 58,000 54,000 Time to Fracture (hrs. > '1 72 116 off 1 1 5otb) Elongation in Z. in... ( ). 26. 0 15.0 21.5 Time to Reach Indicated Reduction Total Deformations of Area (hr, _.:, I -o.... 70.4 (c) (c) 0. 2 1.1 64. 0 c) (c) o. 5 3 68. 5 (c) (c) 1 8 c (c) (c} 8 208 Tine.a; Start of Third Stage Creep (hrs. ) 3. 8 40 Minimum Creep Rate (le/hour) O. 034Z 0. 00079 4W 4Z 4X 10z 7A(d) 5A(d) 4Y 14Z 1 ow S(e) lx e) 1 b-v(e).6'Y &'Z 6w 92z SRR SrpR CRR SRR SRR SRC CRR STR SRR CRR CRR CRR SFRR SRR SRR 1100 1100 1100 1100 1 I00 1100 1100 1100 1100 1100 -1100 lZ00 1200 1200 1Z00 1200 50l000 44, 000 40,000 409000 40,000 35, 000 35 000 28, 000 Z2, 000 13, 000 45, 000 30,000 25,000 20, 000 14 81 399 119 175 Z58 1001 730 off 1 120 off 1104 off 1085 O. Z 15 53 134 36. 0 28. 0 29. 5 33. 8 27. 0 20. 2 14. 5 14. 5 a31. 5 26. 0 Z8. 5 18. 0 80. 5 77. 0 69. 3 72. 8 69. 5 57. 0 56.9 57. 9 -W 81. 0 74. 3 77. 0 65. 8 {c) {C) ow A (c) (c) (c) (c) (c) (c) it) 0. 5 (c) o. 5 (c) 4 1 58 40 1090 0. 2 1.! ow -a 2 19 2.5 16 5 15 n Z3 16 234 17 199 318 1790(f) 23oo(l3 - 5 160 *A 394 448 O. 0055 0, 0015 O. 0024 0O 00033 Ok 0001 0. 00007 (c) (C) (c) (c) (c) (C) 0. 3 0. 5 (c) 0.9 8.4 25 6 4. 2 19. 6 SO 4O,m O. 0146 (a) SRR Surface plane radial specimen at rim of disk C"R "Central plane radial specimen at rim of disk SRC Surface plane radial specimen at center of disk STR Surface plane tangential specimen at rim of disk (b) Test discontinued at this time (c} Specimen reached this deformation on loading (d} 0. 250-inch diameter specimen (e) Creep test I!'< 7 3 -- + -n' 1 n4- ^- wron_ gsIv. 0

Table X High Temperature Strengths of C-422 Bar Stock and C-422 Disk Material Material Disk No. 1 Heat Treatment Stress to Cause 1-Percent Total Test Rupture Strengths Deformation at Indicated Times Temp. (psi) (psi) (*F) 1 hr 10 hr lOOhr 1000lhr 1 hr 10 hr lOOhr 500 hr 1000 hr 1100 57,500 47,000 38,750 32,000 44,500 38,750 33,500 30,500 29,000 (a) N. 1900~F + T. 2 Hrs. at 1200~F. - (b) Full anneal 6 Hrs. at 1600~F. N.1900~F + T. at 1200~F for 2 + 2 Hrs. BarStock N. 1900~F + T. 1100 - - - 34,000 - - 36,500 31,000 24 Hrs. at 1200~F DiskNo. 4 (a)O.Q. 1900~F+T. 1000 72,500* 66,500 61,000 55,500 67,000 60,000 54,000 51,000 8 Hrs. at 1200~F. (b)Fullanneal6Hrs. 1100 61,500* 51,000 43,000 35,500 50,500 42,000 35,500 31,750 at 1600~F. O.Q.. 19000F+T.atl200~F 1200 37,500 30,250 21,500 - 35,500 27,000 17,500 for 2 + 2 Hrs. BarStock O.Q. 1900~F + T. 1100 -- - - - 4 Hrs. at 1200OO 28, 750 49, 000 30,000 30,000 * Estimated values

Table XI Time-Deformation and Creep Strengths at 1100 F for C 422 Disk No. 4 Heat Treatment: First treatment - 0. Q. 1900~F + T. 8 Hrs. at 1200~F Second treatment - Full Anneal 6 Hrs. at 1600~F. 0. Q. 1900~F + T. at 1200~F for 2 + 2 H3 'S. Total Deformation (%) 0. 1 0.2 0. 5 1. 0 Transition Rupture Stress to Cause Total i. I... i i, 0 - 1 hr 22, o00 32. 250 44,000 50, 500 57,000 61, 500* 10 hr 16,000 26,000 36,500 42,000 47,500 51,000 Deformations at Indicated Times (PSi)..... 100 hr 500 hr l000 hr 11, 500 20,250 15,000 13,250 30,250 26,.500 24,750 35,500 31,750 30,000 39,500 35,000 33,000 43,000 38.000 35,500 - Creep Strength (psi) O.0001%/hour 0. 001%/hour 22,000 32,000, * Extrapolated value

Table XII Short Time Tensile Properties of C-422 Disk No. 4 Heat Treatment: First treatment - Q. 1900~F + T. 8 Hrs. at 1200~F Second treatment - Full Anneal 6 Hrs. at 1600~F. 0. Q. 1900~F + T. at 1200~F for 2 + 2 Hz rs. Specimen Number 14Y 1Y 3W IZ 14W 3Y 3X 14X 3Z Specimen Location (a) RR RC CTR CRR SRR SRR STR CRR CRR CTR SRR Test Temp. (~F) Room Room 1.000 1000 1000 1100 1100 1100 1200 1200 1200 Tensile Offset Yield Strengths Strength (psi) 141,250 133, 000 83,500 84,000 78,000 66,250 64,500 67, 000 49,500 48,500 50,000 0. 02% 97, 500 90,250 54,500 55,500 52,500 45, 500 42,500 37,500 28,500 28,000 26,250 (psi) 0. 1% 108, 000 101, 500 70,250 69,250 65,750 55,500 53, 250 54,500 39,250 36,250 39,250 O.2% 112, 750 106, 250 75, 500 74,000 70,750 60, 250 58, 250 60,000 43,750 41, 500 44,250 Proportional Limit (psi) 82,750 71,500 38, 500 36,000 38,000 35,500 30,500 22, 000 13,500 19,500 15,500 Elongation in 2 in. (%) 16. 2 11.1 30.0 29. 0 34. 5 37. 0 39. 0 31. 5 40. 5 39. 0 45. 5 Reduction of Area (%) 39. 0 23. 5 70. 0 66. 7 78. 8 79. 8 81.4 76.8 86. 8 83. 8 87.5 (a) RR Radial specimens at rim of disk RC Radial specimens at center of disk CTR CRR SRR STR Central plane tangential specimen at rim of disk Central plane radial specimen at rim of disk Surface plane radial specimen at rim of disk Surface plane tangential specimen at rim of disk

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UNIVERSITY OF MICHIGAN Il3i fli Hlll i ilil l. N IIiii llll 3 9015 03526 9:979