On the thermo-mechanical stability and oxidation behavior of carbon S-phase at elevated temperature and under tensile stress

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:600

Article

Li, W.^1,2  Li, X.¹  Chiu, Y. -L.¹  Dong, H.¹ 

[1] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

关键词: Plasma carburizing;    S-phase;    Stability;    Tensile stressing;    Oxidation;   

DOI  :  10.1016/j.msea.2014.02.013

来源: Elsevier

【 摘 要 】

The thermo-mechanical stability and oxidation behavior of S-phase are critical issues for some industrial applications at elevated temperatures owing to its metastable nature. In this study, the stability and oxidation behavior of carbon S-phase generated by plasma carburizing on AISI316 under both thermal and mechanical conditions was investigated for the first time. The experimental results demonstrate that when tested at a fixed temperature the thickness of the carbon S-phase layer increased with the stress applied to the tensile specimens during the thermo-mechanical stability tests. This indicates that tensile stress promotes the diffusion of carbon in the carbon-S-phase. The oxidation resistance of the carbon S-phase at 500 degrees C is inferior to untreated AISI 316, which further deteriorated under tensile stress. The lattice expansion and high density of crystal defects in the S-phase and the applied tensile stress would facilitate the diffusion of oxygen and iron, thus promoting oxidation. (c) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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