Effect of thickness on degradation of austenitic 347H steel by direct-fired supercritical CO2 power cycle environment

Akanda, Sajedur R.; Oleksak, Richard P.; Repukaiti, Reyixiati; Rozman, Kyle A.; Doğan, Ömer N.

doi:10.1016/j.corsci.2021.109795

Title: Effect of thickness on degradation of austenitic 347H steel by direct-fired supercritical CO₂ power cycle environment

Journal Article · 25 August 2021 · Corrosion Science

DOI: https://doi.org/10.1016/j.corsci.2021.109795 · OSTI ID:1823517

Akanda, Sajedur R. ^[1]; Oleksak, Richard P. ^[1];

^[2]; Rozman, Kyle A. ^[1]; Doğan, Ömer N. ^[1]

National Energy Technology Lab. (NETL), Albany, OR (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States); Oregon State Univ., Corvallis, OR (United States)

Austenitic 347H steel of two thicknesses (2.54 and 0.6 mm) was exposed to a simulated direct-fired supercritical CO₂ (sCO₂) power cycle environment at 650°C and 1 atm for 1000 h then tensile stressed at room temperature to study the deformation behavior. The thicker 347H formed a protective chromia scale over most of the surface, which minimized carburization of the underlying steel and resulted in no change in mechanical performance. In stark contrast, the thinner 347H formed non-protective Fe-rich oxides over the entire surface, resulting in extensive carburization of the underlying steel. Finally, this led to increased strength but significantly reduced ductility, resulting in partially brittle failure

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Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM)

OSTI ID:: 1823517

Report Number(s):: DOE/NETL-2021/2744

Journal Information:: Corrosion Science, Journal Name: Corrosion Science Journal Issue: 1 Vol. 192; ISSN 0010-938X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Effect of thickness on degradation of austenitic 347H steel by direct-fired supercritical CO2 power cycle environment

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Title: Effect of thickness on degradation of austenitic 347H steel by direct-fired supercritical CO₂ power cycle environment