Competing mechanisms of particle fracture, decohesion and slip-driven fatigue crack nucleation in a PM nickel superalloy

被引：33

作者：

Bergsmo, Alexander ^{[1
]}

Dunne, Fionn P. E. ^{[1
]}

机构：

[1] Imperial Coll London, London, England

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 135卷

基金：

英国工程与自然科学研究理事会;

关键词：

Crystal plasticity; Non-metallic inclusions; Fatigue initiation; Nickel Superalloy; Cohesive zone model; HIGH-CYCLE FATIGUE; CRYSTAL PLASTICITY; STAINLESS-STEEL; VOID NUCLEATION; ENERGY DENSITY; NI SUPERALLOY; INCLUSIONS; INITIATION; DELAMINATION; COMPOSITES;

D O I：

10.1016/j.ijfatigue.2020.105573

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fatigue cracks may initiate around non-metallic inclusions via particle fracture, particle decohesion and slip-driven nucleation. Cohesive zone techniques within microstructurally faithful crystal plasticity modelling validated by micromechanical experiments (HR-DIC and HR-EBSD) are employed to investigate these nucleation phenomena. Particle fracture and decohesion lead to stress redistribution which influences subsequent energy storage driving slip-driven fatigue crack nucleation. Particle fracture and decohesion strengths were determined and using a stored energy criterion, the number of cycles to initiation of the fatigue microcrack was predicted. A threshold applied stress below which decohesion and fracture do not occur was obtained, thus modestly increasing fatigue life.

引用

页数：13

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