Influence of crystallographic orientation on fatigue crack at notch of Inconel 718 alloy

被引：4

作者：

Wang, Jie ^{[1
]}

Shen, Jiebin ^{[2
]}

Chen, Ziqing ^{[3
]}

Wang, Qingchun ^{[1
]}

机构：

[1] Chengdu Aeronaut Polytech, Automot Engn Sch, Chengdu, Peoples R China

[2] Chengdu Holy Grp Ind Co Ltd, Chengdu, Peoples R China

[3] Sichuan Univ, Sch Biomed Engn, Chengdu, Peoples R China

来源：

COMPUTATIONAL MATERIALS SCIENCE | 2024年 / 236卷

关键词：

Notch; Fatigue crack initiation; Crystallographic orientation; Grain misorientation; INITIATION; BEHAVIOR; GROWTH; PRECIPITATION; PROPAGATION; BOUNDARIES;

D O I：

10.1016/j.commatsci.2024.112838

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The impact of crystal orientation and misorientation on the fatigue crack in Inconel 718 nickel-based alloy at Vnotch was explored. The crystal plasticity finite element (CPFE) simulation method was utilized to simulate the impact of varying crystal orientations and misorientation on stress and deformation in the notch root area, and then the potential location and mechanism for fatigue crack initiation on both notch surface and subsurface were analyzed. It was found that crystal orientation and misorientation significantly influenced both the fatigue crack initiation and propagation at notch. Specifically, the competition between notch stress concentration and grain orientation was found to influence the initiation of fatigue cracks on either notch surfaces or subsurface. The magnitude of misorientation was observed to affect the path or direction of crack propagation following initiation. The study unveiled the influence of micro-heterogeneity on fatigue cracks at macroscopic notch, thereby providing a theoretical foundation for predicting and optimizing the fatigue life of nickel-based alloys.

引用

页数：9

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