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

W. Li, X. Li, Y.-l. Chiu, H. Dong

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Abstract

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 °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.
Original languageEnglish
Pages (from-to)90-98
JournalMaterials Science and Engineering A
Volume600
Early online date12 Feb 2014
DOIs
Publication statusPublished - 1 Apr 2014

Keywords

  • Plasma carburizing
  • S-phase
  • Stability
  • Tensile stressing
  • Oxidation

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