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Effects of Alloying Elements on the Characteristics of Microstructure and High Temperature Oxidation of Cast Austenitic Stainless Steel  

Lee, In-Sung (Department of Material Science and Engineering, Yonsei University)
Jeon, Soon-Hyeok (Department of Material Science and Engineering, Yonsei University)
Kim, Soon-Tae (Department of Material Science and Engineering, Yonsei University)
Lee, Jung-Suk (Advanced Technology Center, Hyundai.Kia Motors Corp.)
Ko, Young-Sang (Advanced Technology Center, Hyundai.Kia Motors Corp.)
Kim, Jong-Myoung (Advanced Technology Center, Hyundai.Kia Motors Corp.)
Publication Information
Journal of Korea Foundry Society / v.30, no.5, 2010 , pp. 179-186 More about this Journal
Abstract
To elucidate the effects of alloying elements on the characteristics of microstructure and high temperature oxidation of cast austenitic stainless steel, a thermodynamic calculation, a cyclic oxidation test, a X-ray diffraction, a scanning electron microscopy-back scattered electron, a electron probe microanalysis were conducted. The thermodynamic calculation for the effect of vanadium (V) addition on the formation of various precipitates leads to a decrease of chromium (Cr)-rich $M_{23}C_6$ carbides due to the formation of M (C, N) carbo-nitrides containing V and / or niobium (Nb). The V added alloy increased the resistance to high temperature oxidation due to a decrease of Cr-depleted zone deteriorating the oxidation resistance and due to the V-enriched oxide layer formed in inner oxide layer blocking the outward transport of cations.
Keywords
Austenite stainless steel; Oxidation; SEM-BSE; EPMA; Vanadium;
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