The Influence of Pre-deformationon Tensile Properties of Hydrogen-chargedaustenitic Stainless Steels
(0) The effect of pre-deformation before hydrogen charging on tensile properties of hydrogen-charged austenitic stainless steels,such as STS 310S and STS 316L,was investigated through the slow strain rate tensile tests(SSRTs)and thermal desorption analysis(TDA).Theelongations of both steels decreased due to atransition of ductile-to-brittle fracture by hydrogen charging.For STS 310S,the degree of the reduction in elongation by hydrogen charging decreased with increasing pre-strain.The TDA revealed that the migration of hydrogen atoms to twin boundaries was hindered by pre-strain.Therefore,the reason why pre-strain suppressed the fracture transition was that pre-strain hindered both mechanical twinning during SSRT sand hydrogen atomsdelivery to twin boundaries.For STS 316L,the pre-strain degraded the resistance to hydrogen embrittlement.The formation of ε-martensitewas accelerated by pre-strain in hydrogen-charged specimens during SSRTs.The TDA elucidated that hydrogen atoms migrated from grain boundaries and dislocations to not only mechanical twins but γ/ε interfaces in pre-strained specimens during the SSRTs.Accordingly,the elongation loss by pre-strain resulted from both the increase in fraction of ε-martensite with pre-strain and the segregation of hydrogen atoms to γ/ε interfaces.
hydrogen embrittlement pre-deformation austenitic stainless steel mechanical twin ε-martensite
Lee Young-Kook Park Il-Jeong Ji Hyunju
Department of Materials Science and Engineering,Yonsei University,Seoul 120-749,Korea
国内会议
上海
英文
1-5
2015-10-21（万方平台首次上网日期，不代表论文的发表时间）