Effect of laser peening with different power densities on vibration fatigue resistance of hydrogenated TC4 titanium alloy

被引：39

作者：

Huang, Shu ^{[1
]}

Zhao, Jiaxi ^{[1
]}

Sheng, Jie ^{[1
]}

Meng, Xiankai ^{[1
]}

Agyenim-Boateng, Emmanuel ^{[1
]}

Ma, Donghui ^{[1
]}

Li, Jing ^{[1
]}

Zhou, Jianzhong ^{[1
]}

机构：

[1] Jiangsu Univ, Sch Mech & Engn, Zhenjiang 212013, Jiangsu, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 131卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Laser peening; Vibration fatigue resistance; Hydrogen embrittlement; Fracture morphology; TC4 titanium alloy; CRACK GROWTH-PROPERTIES; MECHANICAL-PROPERTIES; RESIDUAL-STRESS; EMBRITTLEMENT; TI-6AL-4V; BEHAVIOR; FRICTION; MARINE; WEAR; STEELS;

D O I：

10.1016/j.ijfatigue.2019.105335

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Laser peening (LP) treatment with different power densities was used to improve the vibration fatigue resistance of hydrogenated TC4 titanium alloy. Compressive residual stress (CRS), micro-hardness and micro-structure of hydrogenated LPed specimens were firstly measured. Vibration fatigue test was then carried out to compare the fatigue life and fractures of LPed and non-LPed hydrogenated specimens. It was found that LP-induced high level CRS suppressed the permeation of hydrogen atoms through material surface, which may reduce the hydrogen embrittlement sensitivity. The CRS also prohibited the fatigue crack initiation and propagation by increasing the fatigue limit and crack propagation threshold of hydrogenated specimen. Grain morphologies of alpha phase and beta phase were refined after LP. Beneficial crystal defects inside the a phase and beta phase tangled more free hydrogen atoms, which was believed to be crucial factors to inhibit the generation of initial hydrogen-induced crack. Fracture morphologies further confirmed that LP changed the location of fatigue crack initiation (FCI) and slowed down the fatigue crack growth (FCG) rate of hydrogenated specimens. Finally, a strengthening mechanism of LP on the vibration fatigue resistance of hydrogenated specimen was proposed.

引用

页数：12

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