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Materials Science at Oregon State University

Performance of Ni-superalloy Haynes 282 with exposure to supercritical fluids

Date: Thursday, May 26th
Presenter: Dr. Kyle Rozman, National Energy Technology Laboratory

Abstract


The National Energy Technology Laboratory is conducting research to increase the efficiency and reduce carbon emissions for fossil fuel power production. To increase efficiency of power production beyond that of steam turbines, research into using supercritical CO2 (sCO2) as replacement working fluid is being conducted. While gains in efficiency and reduction in capital costs are projected utilizing sCO2 as a working fluid, the corrosion and mechanical response is not well quantified. This presentation will explore the high temperature oxidation results and preliminary mechanical response of nickel based superalloy Haynes 282 to supercritical water (sH2O) and CO2 environments (both sCO2 and atmospheric pressure CO2). Oxidation results indicate deeper chromia scale on sH2O samples and deeper internal oxidation in the CO2 environment. Ex-situ fatigue crack growth results indicate a statistically significant reduction in threshold stress intensity range with exposure to CO2 environment. No reduction in fatigue crack growth threshold stress intensity was observed from exposure to sH2O.

Bio:
Kyle graduated from Milwaukee School of Engineering with a bachelor’s of science in mechanical engineering. Kyle continued his education at Oregon State University, obtaining a Master’s of Science in 2011 and Doctorate of Philosophy in 2013, both in materials science. Currently Kyle is working at the National Energy Technology Laboratory in Albany, Oregon on the structural materials team where Kyle is researching the effects of supercritical fluids on mechanical properties of materials.