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Creep testing of fine-grained MA754 in the transverse orientation was also completed. The results indicate that the fine-grained material is significantly weaker than coarse- grained, even in the transverse orientation. The results of creep tests are listed in Table 8. The minimum creep rates for the fine-grained MA 754 for temperatures between 800- 1000oC are shown in Figure 21. The stress exponents are slightly lower than those for the coarse-grain material in the transverse orientation. Table 7: MA754 Fine-Grained Tensile Data Specimen MA754F-T-1 MA754F-T-2 MA754F-T-3 MA754F-T-4 MA754F-T-5 MA754F-T-6 MA754F-T-7 MA754F-T-8 MA754F-T-9 Test Temperature Modulus (°C) (GPa) 25 225 25 231 800 47 800 39 900 27 900 39 1000 25 1000 35 1000 48 Yield Strength UTS Ductility RA (MPa) (MPa) (%) (%) 1170 1257 7.7 16 1203 1297 8.8 18 118 138 40 46 141 148 40 45 90 91 32 51 86 89 38 49 64 67 19 27 60 65 19 34 60 67 20 34 Table 8: MA754 Fine-Grained Creep Data – Transverse Orientation Test/Specimen ID MA754F-T-16 MA754F-T-15 MA754F-T-11 MA754F-T-12 MA754F-T-14 MA754F-T-18 MA754F-T-13 MA754F-T-10 MA754F-T-17 MA754F-T-17 Orientation Transverse Transverse Transverse Transverse Transverse Transverse Transverse Transverse Transverse Transverse Test Temperature Stress (°C) (MPa) 800 45 800 60 800 74 800 92 900 25 900 35 900 45 900 64 1000 10 1000 20 Minimum Creep Rate (sec-1) 5.40E-09 7.30E-08 7.90E-07 3.10E-09 3.50E-08 1.70E-07 5.50E-06 7.80E-09 1.20E-07 Time to Rupture Ductility RA (hr) (%) (%) 268 0.7 0 35.4 1.5 0 6.4 3.2 0 0.9 13.5 15 1138 2.4 0 105 1.6 0 15.4 1.6 0 1.1 3.2 0 > 1670 > 24 0 83 5.4 0 23PDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility
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