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Meeting MS&T22: Materials Science & Technology
Symposium Steels for Sustainable Development
Presentation Title Influence of C and N on Hydrogen Embrittlement in 17Cr-10Ni-6Mn Stable Austenitic Stainless Steel
Author(s) Yeonggeun Cho, Hyung-Jun Cho, Sung-Joon Kim
On-Site Speaker (Planned) Yeonggeun Cho
Abstract Scope 17Cr-10Ni-6Mn stable austenitic stainless steels containing 0.2 wt.% of C or N were hydrogen charged and tensile tested to compare the effect of interstitial elements on hydrogen embrittlement (HE). Addition of C or N increased the tensile strength and decreased the HE susceptibility, and improvement of HE resistance was greater by C than by N. Improvement of strength and HE resistance by C or N addition are mainly attributed to expansion of austenite lattice and increase of activation energy for hydrogen desorption. N showed lower solid solution hardening and less degree of twinning than C, which resulted in lower tensile strength in N-added steel. Activation energy for hydrogen desorption was higher in C-added steels, indicating that C was more effective on decreasing the hydrogen diffusivity, which corresponds to smaller depth of hydrogen-affected zone. In addition, N promoted planar slip and accelerated localized deformation, which contributed to higher HE susceptibility.


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