Effect of Dendritic Structure and Secondary Phases on the Fatigue Behavior of ERNiCrMo-3 Weld Metal
发布时间：2024-03-10点击次数：
- DOI码：10.1016/j.ijfatigue.2023.108113
- 所属单位：南京工程学院
- 教研室：0
- 发表刊物：International Journal of Fatigue
- 刊物所在地：荷兰
- 项目来源：江苏省自然科学基金，2020年“双创计划”特别人才引进，江苏省先进结构材料与应用技术重点实验室开放项目，南京工程学院人才引进研究基金
- 关键字：fatigue crack propagation, dendritic structure, ERNiCrMo-3 weld metal, element segregation,local plastic deformation, post-weld heat treatment.
- 摘要：The effect of dendritic structure and secondary phases on the fatigue crack propagation mechanism of ERNiCrMo-3 weld metal was investigated. Element segregation in the weld metal induced severe lattice distortion in the interdendritic region, creating substantial variations in mechanical properties between the dendrite core and interdendritic region. This disparity resulted in an unstable crack propagation rate. The limited plastic deformation capacity of the interdendritic region caused a contraction in the local plastic deformation zone at the crack tip, increasing stress concentration and accelerating crack propagation. The fatigue crack in the interdendritic regions exhibited a rate of approximately 2.6 μm/cycle, surpassing the 1.5 μm/cycle observed in the dendrite cores. Meanwhile, element segregation promoted the precipitation of numerous Laves phases in the interdendritic regions. With increasing stress, micro-voids formed by broken Laves phases served as rapid channels for crack propagation. Post-weld heat treatment weakened the non-uniformity of the microstructure. The fatigue crack propagated at a rate of about 1.2 μm/cycle. Furthermore, the dissolution of Laves phases and the precipitation of γ″ enhanced the fatigue performance of the weld metal. Under equivalent stress levels, the fatigue life of post-weld heat-treated weld metal increased by approximately 1.2 times compared to that of as-welded metal.
- 备注：0
- 论文类型：研究论文
- 论文编号：108113
- 卷号：180
- ISSN号：1879-3452
- 是否译文：否
- 发表时间：2024-01-01
+
论文成果
个人信息
- 性别：男
- 职称：副教授
- 学历：研究生
- 学位：博士
- 所在单位：材料科学与工程学院
- 学科： 材料加工工程
- 电子邮箱：
其他联系方式
- 通讯/办公地址：
- 移动电话：
- 邮箱：