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Task 3. Materials Testing Research on the creep behavior and corrosion resistance in supercritical CO2 of MA 754 continued during FY04. The creep behavior of both coarse-grained as well as fine- grained MA 754 was documented. Creep microstructures were documented and fracture analysis was carried out on failed creep samples. A manuscript documenting the results was prepared and submitted to a peer-reviewed journal for publication. Final modifications were made to a supercritical CO2 loop and the corrosion behavior of MA 754 in flowing supercritical CO2 at 1000oC and 1500 psi was documented. Experiments were carried out at exposure times ranging from 47 to 335 hours. The time-averaged corrosion rate was found to decrease as the exposure time increased. The corrosion rate at the 335-hour exposure test equated to less than 1 mm/year. Microscopic examination indicated that a corrosion layer formed and grew slowly. The corrosion layer also acted to protect the base material from further corrosion. Overall, it was concluded that MA 754 possessed high creep resistance at 1000oC, better than other high temperature metallic alloys, and acceptable corrosion resistance to supercritical CO2. From these results it was determined that the study of creep and corrosion resistance of MA 758, that has a higher chromium content for added corrosion resistance, may not be necessary. This issue is being worked with the sponsor. The detailed results of work performed during FY04 are given below for the various materials-related tasks. Task 3-1-2 High temperature mechanical and creep properties of coarse-grained MA 754 During FY04, creep testing of annealed (coarse-grained) MA 754 specimens with both longitudinal and transverse orientations was completed. Creep and stress rupture data are graphically presented in Figures 16 through 19. In the longitudinal direction, high stress exponents are observed at the temperatures studied, consistent with the threshold behavior for this alloy. At a fixed stress, creep rates in the transverse orientation are much higher than in the longitudinal, in some cases greater than an order of magnitude. The stress exponents in the transverse direction decrease with increasing temperature; at temperatures of 900 and 1000°C the exponents are sufficiently low (less than 10) that threshold behavior is not observed. The reduction in stress exponent is believed to result from increased grain boundary diffusion and sliding at the higher temperatures. 19PDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle
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