四川大学学报（自然科学版）2024，Vol.61Issue(3)：247-254,8.DOI:10.19907/j.0490-6756.2024.034002
氢对体心立方Fe中位错与Cr析出相相互作用的影响
Effect of hydrogen on the interaction between dislocation and Cr precipitate in BCC Fe
摘要
Abstract
Fe-Cr-based ferritic/martensitic(FM)steels,used as structural materials for the fourth generation nuclear reactors,are subjected to premature failure due to the generation of large amounts of hydrogen atoms caused by transmutation reactions in the service environment.In this paper,the effect of hydrogen on the inter-action between the edge dislocations and Cr precipitates in BCC Fe was investigated based on molecular dy-namics using the recently developed angle-dependent potential(ADP)of the Fe-Cr-H ternary system.The re-sults show that hydrogen atoms reduce the critical depinning stress required for dislocation to detach from the Cr precipitate.Under lower strain rates(5×107 s-1,2×107 s-1),hydrogen reduces the critical debonding stress significantly,while under higher strain rates(108 s-1),the hydrogen-induced change of the critical stress is not significant.The smaller is the distance between precipitates,the larger is the critical depinning stress of hydrogen reduction,and vice versa.关键词
氢脆/位错/析出相相互作用/Cr析出相/分子动力学Key words
Hydrogen embrittlement/Dislocation/precipitate interaction/Cr precipitate/Molecular dynamics分类
数理科学引用本文复制引用
何杰,赵凯,张修路..氢对体心立方Fe中位错与Cr析出相相互作用的影响[J].四川大学学报（自然科学版）,2024,61(3):247-254,8.基金项目
国家自然科学基金(41574076,12102145) （41574076,12102145）
宜宾学院计算物理四川省高等学校重点实验室开放基金(ybxyjswl-zd-2020-007) （ybxyjswl-zd-2020-007）
江苏省自然科学基金(BK20210444) （BK20210444）
