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Table 4-1. Longitudinal Creep Conditions and Results For Coarse-Grained MA 754 Specimen ID Temperature Stress Minimum Creep Rate Time to Rupture Elongation RA (°C) (MPa) (sec-1) (hr) (%) (%) L-17 800 196 6.3x10-9 1414 9 15 L-15 800 211 1.2x10-7 72 14 36 L-13 800 224 1.2x10-6 11.8 23 50 L-14 800 224 1.9x10-6 7.3 23 48 L-19 900 156 3.6x10-9 1553 3.9 7 L-18 900 169 1.1x10-7 84 9 19 L-20 900 200 2.7x10-6 3.9 9 28 L-16 900 204 4.9x10-5 0.3 12 49 L-24 1000 126 7.0x10-10 747 1.4 14 L-21 1000 135 5.9x10-9 306 1.4 4 L-25 1000 142 4.8x10-8 108 3.7 4 L-22 1000 150 9.5x10-8 49 3.6 7 where Qc is the corrected activation energy. A value of 350 kJ/mol was calculated at 900°C using elastic modulus data for textured MA 754 [Special Metals Corporation, 2002] and an n value of 33.5 (the mean of n values at the three temperatures). The corrected activation energy agrees reasonably well with the activation energy for self-diffusion of Ni in Ni- 20 wt% Cr alloy, ~285 kJ/mol. Table 4-2. Transverse Creep Conditions and Results For Coarse-Grained MA 754 Specimen ID Temperature Stress Minimum Creep Rate Time to Rupture Elongation RA (°C) (MPa) (sec-1) (hr) (%) (%) T-32 800 132 3.0x10-9 287 0.7 0 T-46 800 160 1.4x10-9 760 0.4 0 T-39 800 175 5.8x10-9 235 0.8 0 T-37 800 182 6.1x10-9 266 0.1 0 T-41 800 183 1.2x10-8 124 1.3 0 T-38 800 189 1.0x10-7 37 2.1 0 T-42 800 196 8.7x10-8 41 2.0 0 T-44 800 206 5.7x10-7 11 4.6 8 T-50 900 98 1.8x10-9 327 0.5 0 T-33 900 114 6.1x10-9 115 0.4 0 T-36 900 121 7.7x10-9 98 0.4 0 T-40 900 124 9.2x10-9 82 0.5 0 T-43 900 129 2.4x10-8 59 0.9 0 T-45 900 136 1.7x10-8 46 0.6 0 T-47 900 145 1.5x10-8 34 0.6 0 T-48 900 160 8.0x10-8 10 0.8 0 59PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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