1. Hydrogen embrittlement behavior in interstitial Mn–N austenitic stainless steel.
- Author
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Mao, L.Y., Luo, Z.A., Huang, C., and Zhang, X.M.
- Subjects
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AUSTENITIC stainless steel , *HYDROGEN embrittlement of metals , *AUSTENITIC steel , *EMBRITTLEMENT , *BRITTLE fractures , *MARTENSITIC transformations , *STAINLESS steel , *MANGANESE - Abstract
The susceptibility to hydrogen embrittlement behavior was investigated in an interstitial Mn–N austenitic steel HR183 and stainless steel 316L. Hydrogen was introduced by cathodic hydrogen charging at 363 K. HR183 has stronger austenite stability than 316L despite its lower nickel content, the addition of manganese and nitrogen inhibited martensitic transformation during the slow strain rate tensile deformation. Due to the diffusion of hydrogen being delayed by the interstitial solution of nitrogen atoms and the uniform dislocation slips, hydrogen permeates more slowly in HR183 than 316L, contributing to an 84.79 μm thinner brittle fracture layer in HR183 steel. Hydrogen charging caused elongation losses in both 316L and HR183 steels associated with the hydrogen-enhanced localized plasticity (HELP) and hydrogen-enhanced decohesion (HEDE) mechanism. However, the hydrogen embrittlement susceptibility of HR183 is 3.4 times lower than that of 316L according to the difference in elongation loss between the two steel after hydrogen charging. Deformation twins trapped a lot amount of hydrogen leading to brittle intergranular fracture in 316L. The multiple directions of slip in HR183 steel suppressed the strain localization inside grains and delayed the adverse effects conducted by HELP and HEDE mechanism, eventually inhibiting server hydrogen embrittlement in the HR183 steel. This study is assisting in the development of low-cost stainless steel with excellent hydrogen embrittlement resistance that can be used in harsh hydrogen-containing environments. [Display omitted] • SIM was suppressed by adding manganese and nitrogen with low nickel content. • Interstitial nitrogen affected the solubility of hydrogen in FCC lattice and slowed down the permeation of hydrogen. • The HELP and HEDE mechanism conducted hydrogen embrittlement in interstitial Mn–N austenitic steel. • Multiple directions of slip alleviated the adverse effect of HELP and HEDE mechanism. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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