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Task 3: The objective of this task was to explore the high temperature creep and corrosion behaviors of high temperature alloys under conditions expected in the supercritical CO2 Brayton cycle. Alloys MA 754, an oxide dispersion strengthened nickel-based alloy, and I-617, a solid solution nickel- base alloy, were chosen for evaluation. The following was found: Coarse-grained MA 754 possesses superior high temperature strength and creep resistance (~2x) compared to other high temperature alloys such as I-617 Fine-grained MA 754 exhibits better ductility but lower yield strength than coarse-grained MA 754 at temperature above 800oC. Both fine- and coarse-grained MA 754 exhibit very low ductility in creep, generally less than 5%, in the transverse orientation. Use of MA 754 as a pressure boundary material at high temperatures is desirable from a strength point-of-view, however, it is not from a fracture point-of-view due to the low creep ductility. A corrosion rate of 0.2 mm/year was measured for coarse-grained MA 754 after an exposure of 500 hours in supercritical CO2 at 1000oC and 7 MPa. This appears to still be a transient value and longer exposures are required to establish the steady-state corrosion rate and evaluate the potential for spalling and metal dusting. The corrosion product that forms on MA 754 in high temperature, supercritical CO2 is predominately chromium oxide. Alloy I-617 exhibits a corrosion rate approximately 5 times lower than MA 754 in supercritical CO2 at 1000oC and 7 MPa at short exposure time (~175 hours). However, I-617 exhibits intergranular corrosion, while MA 754 does not, which may lead to very high corrosion rates at long exposure times. Long term (> 1000 hours) supercritical CO2 exposures at 1000oC and 7 MPa will be required to fully characterize the corrosion behaviors of MA 754 and I-617. 77PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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