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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Energy Materials 2017: Materials in Clean Power
Presentation Title High Temperature Oxidation of Ni-base Alloys and Stainless Steels in Supercritical CO2 for Power Systems Applications
Author(s) Gordon R Holcomb, Ímer N Doğan, Joseph Tylczak, Casey Carney, Kyle Rozman, Jeffrey A Hawk
On-Site Speaker (Planned) Gordon R Holcomb
Abstract Scope Materials selection for components exposed to emerging supercritical CO2 (sCO2) power cycles is challenging since materials have not been commonly tested under these conditions. It is expected that these systems will use sCO2 as a working fluid at temperatures up to 800░C and pressures up to 35 MPa. The high temperature oxidation behavior of chromia-forming alloys was investigated in sCO2 and atmospheric pressure CO2. Environments associated with both indirect and direct sCO2 power cycles were examined. The alloys studied included model alloys based on Ni (5-24)Cr, Ni22Cr(0-1.5)Si, Fe22Cr(0-1.5)Si, and Fe22Ni22Cr(0-1.5)Si, commercial iron-base stainless steels E-Brite, 304H and 600, and Ni-base alloys 230, 263, 282, 617, 625, 740H, and 800. Experimental work included coupon exposures up to 2000 hours, mass change determination, SEM and XRD. Distinctions in the materials response with pressure are discussed, along with the effects of chromium and silicon contents.
Proceedings Inclusion? Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)


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High Temperature Oxidation of Ni-base Alloys and Stainless Steels in Supercritical CO2 for Power Systems Applications
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The Impacts of Alternative Fuels and Associated High Water Vapor Content Environments on the Stability and Aging of Turbine Hot-Section Materials
Transient Liquid Phase Bonding of Ni-based-superalloy-H230 for Microchannel Heat Exchanger for Application in Supercritical CO2 Cycles

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