Improved rotating bending fatigue performance of laser directed energy deposited Ti6Al4V alloys by laser shock peening

被引：42

作者：

Zhang, Yongxin ^{[1
]}

Guo, Wei ^{[1
]}

Shi, Jiaxin ^{[1
]}

Chi, Jiaxuan ^{[2
]}

Chen, Guoxing ^{[3
,4
]}

Han, Guofeng ^{[5
]}

Zhang, Hongqiang ^{[1
]}

机构：

[1] Beihang Univ, Sch Mech Engn & Automat, Beijing 100191, Peoples R China

[2] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[3] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China

[4] Suzhou Nucl Power Res Inst Co Ltd, Suzhou 215004, Peoples R China

[5] Army Acad Armored Forces, Natl Key Lab Remfg, Beijing 100072, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2024年 / 980卷

基金：

中国国家自然科学基金;

关键词：

Laser shock peening; Laser directed energy deposition; Rotating bending fatigue; Residual stress; Semi -elliptical crack; HIGH-CYCLE FATIGUE; CRACK-GROWTH; TI-6AL-4V ALLOY; MICROSTRUCTURAL EVOLUTION; PHASE-TRANSFORMATION; MECHANICAL-PROPERTIES; SURFACE-ROUGHNESS; STRESS-RELAXATION; STRENGTH CRITERIA; RESIDUAL-STRESS;

D O I：

10.1016/j.jallcom.2024.173664

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A major challenge for additive manufactured titanium blades is to improve an unfavorable fatigue life. In this work, the rotating bending fatigue test was carried out on the laser direct energy deposited (L-DED) titanium alloy to simulate the service condition of the rotating blade, and the laser shock peening (LSP) post-processing was adopted to enhance the fatigue performance. The results showed that LSP induced gradient layer and phase transformation in L-DED Ti6Al4V alloy, and increased the fatigue limit to 570 MPa. The compressive residual stress dominated the crack source transfer confirmed by the finite element method, and its retention capacity under fatigue cycles reduced the semi-elliptical crack growth rate. A fatigue limit prediction formula was established to quantify the contribution of microstructure, residual stress and roughness changes.

引用

页数：17

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