Graduate Institute of Ferrous& Energy materials Technology

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Research Highlight GRADUATE INSTITUTE OF FERROUS TECHNOLOGY

[SSL] Prof. Sung-Joon Kim: Nitrogen effect on hydrogen diffusivity and hydrogen embrittlement behavior in austenitic stainless steels
GIFT 20-09-07 14:35


 
  Hydrogen embrittlement behavior of three austenitic stainless steels with 0.1–0.3 wt% N was investigated by electro-chemical charging of hydrogen. The degradation of tensile properties was alleviated by nitro- gen. Hydrogen permeation testing revealed that the increase of nitrogen content decreased the hydrogen diffusivity, and thereby, reduced the depth of hydrogen-affected zones. Intergranular cracks were formed in an early stage of deformation by hydrogen charging and reduced the strain-hardening rate. The cracks propagated further into the grains along martensite/austenite interfaces especially in steels with less ni- trogen.

2020 Scripta 김경식 N effect.pdf 78회 (1.4M) 2020-09-07 14:35:56

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