Effects of laser peening on tensile properties and martensitic transformation of AISI 316L stainless steel in a hydrogen-rich environment
Effects of laser peening on tensile properties and martensitic transformation of AISI 316L stainless steel in a hydrogen-rich environment
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富氢环境下激光喷丸对AISI 316L不锈钢拉伸性能和马氏体相变的影响
DOI：
10.1016/j.msea.2020.139543
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发表时间：
2020-06-24
期刊：
影响因子：
6.4
通讯作者：
Zhou, Jianzhong
中科院分区：
文献类型：
--
作者：
Huang, Shu;Ma, Donghui;Zhou, Jianzhong
通过富氢环境下的慢应变速率拉伸试验，研究了激光喷丸对AISI 316L不锈钢拉伸性能和马氏体相变的影响。提出了316L钢在富氢环境中发生氢脆的物理化学过程。结果表明，激光喷丸处理后的试样中出现了晶粒细化、机械孪晶和高密度位错。拉伸过程中复杂的晶界和高密度位错阻碍了载氢位错的运动和马氏体相变。在空气和富氢环境中，激光喷丸试样的抗拉强度分别比未激光喷丸试样提高了7.73%和8.45%。在富氢环境中，激光喷丸试样的延伸率损失远小于未喷丸试样。LP处理后的表面产生的压缩残余应力、晶粒细化、高密度位错和致密的表面层有利于抑制氢渗透。
Slow strain rate tensile test in a hydrogen-rich environment was performed to study the effects of laser peening (LP) on the tensile properties and martensitic transformation of AISI 316L stainless steel. Underlying physiochemical processes involved in hydrogen embrittlement of 316L steel in the hydrogen-rich environment has been proposed. Results show that the grain refinement, mechanical twins and high-density dislocations were found in the laser peened specimens. The movement of hydrogen-carrying dislocations and martensite transformation were prevented by complex grain boundaries and high-density dislocations during tensile process. The ultimate tensile strength of the laser peened specimen were increased by 7.73% and 8.45% in air and hydrogenrich environment respectively compared with that of non-laser peened specimen. What's more, the elongation loss of laser peened sample was far less than that of non-LP sample in a hydrogen-rich environment. LP induced compressive residual stress (CRS), grain refinement, high-density dislocations and a dense surface layer on the treated surface are beneficial for suppressing hydrogen penetration.