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http://dx.doi.org/10.3795/KSME-A.2014.38.12.1415

Evaluation of Tensile Property of Austenitic Alloys Exposed to High-Temperature S-CO2 Environment  

Kim, Hyunmyung (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
Lee, Ho Jung (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
Jang, Changheui (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.38, no.12, 2014 , pp. 1415-1420 More about this Journal
Abstract
Super-critical $CO_2$ ($S-CO_2$) Brayton cycle has been considered to replace the current steam Rankine cycle in Sodium-cooled Fast Reactor (SFR) in order to improve the inherent safety and thermal efficiency. Several austenitic alloys are considered as the structural materials for high temperature $S-CO_2$ environment.. Microstructural change after long-term exposure to high temperature $S-CO_2$ environment could affect to the mechanical properties. In this study, candidate materials (austenitic stainless steels and Alloy 800HT) were exposed to $S-CO_2$ to assess oxidation resistance and the change in tensile properties. Loss of ductility was observed for some austenitic stainless steels even after 250 h exposure. The contribution of $S-CO_2$ environment on such changes was analyzed based on the characterization of the surface oxide and carburization of the materials in which 316H and 800H showed different oxidation behaviors.
Keywords
Supercritical Carbon Dioxide; Austenitic Alloys; Corrosion property; Tensile property;
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Times Cited By KSCI : 1  (Citation Analysis)
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