Abstract The effect of hydrogen on the tensile properties of AISI 304 K-TIG weld metal is investigated in this study. Fractographic analysis demonstrates a transition from quasi-cleavage/cleavage fracture to intergranular fracture in the brittle zone as the hydrogen-charging current density increases, which is attributed to the interplay of crystalline defect, hydrogen atoms, and α′ martensite transformation sites. It is believed that at low current density, α′ martensite nucleates and grows homogeneously in the interior of the grain. At high current density, the stress-induced α′ martensite forms preferentially at the grain boundary, which undergoes severe strain localisation and hydrogen atom segregation.

中文翻译：

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拉伸载荷下AISI 304 K-TIG焊缝金属氢脆失效机理转变

摘要 本研究研究了氢对AISI 304 K-TIG 焊缝金属拉伸性能的影响。断口分析表明，随着充氢电流密度的增加，脆性区从准解理/解理断裂向晶间断裂转变，这归因于晶体缺陷、氢原子和α'马氏体转变位点的相互作用。据信，在低电流密度下，α'马氏体在晶粒内部均匀成核和生长。在高电流密度下，应力诱导的α'马氏体优先在晶界处形成，发生严重的应变局部化和氢原子偏析。