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
何杰 1赵凯 2张修路3
作者信息
- 1. 西南科技大学核科学技术学院,绵阳 621010
- 2. 江南大学机械工程学院,无锡 214122;江苏省食品先进制造装备技术重点实验室,无锡 214122
- 3. 西南科技大学核科学技术学院,绵阳 621010;宜宾学院计算物理四川省高等学校重点实验室,宜宾 644000
- 折叠
摘要
作为第四代核反应堆结构材料的Fe-Cr基铁素体/马氏体钢,在服役环境中由于嬗变反应产生大量氢原子而导致过早失效.本文利用最近发展的Fe-Cr-H三元体系的角度依赖势函数,基于分子动力学研究了氢对体心立方Fe中刃位错与Cr析出相相互作用的影响.结果表明,氢原子降低了位错的临界脱钉扎应力.在较低应变率(5×107 s-1、2×107 s-1)下,氢显著降低了临界脱钉扎应力,而在较高应变率(108 s-1)下,氢引起的临界应力变化并不显著.当析出相间距较小时,氢减低临界脱钉扎应力的幅度较大,反之亦然.
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引用本文复制引用
基金项目
国家自然科学基金(41574076)
国家自然科学基金(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(ybxyjswlzd-2020-007)
江苏省自然科学基金(BK20210444)
出版年
2024
国家科技期刊平台
NSTL
万方数据