Effect of surface mechanical attrition treatment on high cycle and very high cycle fatigue of a 7075-T6 aluminium alloy

被引：43

作者：

Gao, Tao ^{[1
]}

Sun, Zhidan ^{[2
]}

Xue, Hongqian ^{[1
]}

Retraint, Delphine ^{[2
]}

机构：

[1] Northwestern Polytech Univ, Sch Mech Engn, Xian 710072, Peoples R China

[2] Univ Technol Troyes, CNRS, ICD, LASMIS,P2MN,FRE2019, Troyes, France

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 139卷

关键词：

SMAT; Aluminium alloy; Fatigue strength; Very high cycle fatigue; Crack initiation; CRACK INITIATION; RESIDUAL-STRESS; BEHAVIOR; STEEL; LIFE; MICROSTRUCTURE; PROPAGATION; PERFORMANCE; IMPROVEMENT; INCLUSIONS;

D O I：

10.1016/j.ijfatigue.2020.105798

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Effects of surface mechanical attrition treatment (SMAT) on fatigue performance of a 7075-T6 aluminium alloy were studied in high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regimes. Fatigue test results showed that SMAT can improve fatigue strength in HCF regime, but decrease it in VHCF regime. Fracture surface observations indicated that the low SMAT intensity is quite optimal, which can protect the surface from crack initiation. However, increasing SMAT intensity could lead to over-peening by inducing deep impact dimples, micro-cracks at the surface and high tensile residual stresses in the subsurface, which deteriorated fatigue performance in VHCF regime.

引用

页数：14

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