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Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility

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Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility ( development-supercritical-carbon-dioxide-brayton-cycle-impro )

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a. b. Base Metal Figure 22: Cross section of the tube end after 47 hours at 3000 psi and 1000oC. a) intergranular cracks shown in thin wall region at the end of the sample (100X) b) magnification of crack indicating material removal (200X). Cross section of crack Figure 23: Cross-section of the end fitting after 47 hours at 3000 psi and 1000 oC showing significant material removal from central region of thin wall area (50X). Long-term corrosion tests (1500 psi – 1000oC) For the long-term corrosion tests the operating pressure was reduced to 1500 psi to more closely simulate the conditions used in Tasks 1 and 2. No cracks leading to premature leaks were detected at the ends of these samples that incorporated the new connection design. Two long-term corrosion tests were run, lasting 120 and 335 hours, respectively. Base Metal 25

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