中国机械工程2018，Vol.29Issue(1)：104-109,6.DOI:10.3969/j.issn.1004-132X.2018.01.016
激光冲击强化对TC4钛合金单面修饰激光焊接接头疲劳性能的影响
Effects of Laser Shock Processing on Fatigue Performances of TC4 Titanium Alloy Single-side Laser Modification Welding Joints
黄潇 1曹子文 2常明 2邹世坤1
作者信息
- 1. 武汉理工大学材料科学与工程学院,武汉,430070
- 2. 北京航空制造工程研究所高能束流加工技术重点实验室,北京,100024
- 折叠
摘要
Abstract
The standard fatigue specimens made of TC4 titanium alloy single-side laser modifica tion welding joints were treated by laser shock processing.The tension fatigue tests were conducted to verify the reinforcement effects,and the fracture analyses were utilized to analyze the fatigue mechanism of the treated specimens.The strengthening mechanism of fatigue performances was explained by the experiments of micro-hardness,microstructure and residual stress.The results show that the fatigue cracks of all specimens are initiated in the welding undercut,while the fatigue life of the treated specimens is increased to 3.77～9.15 times by LSP.Coarse martensite refinement is generated in the welding undercut ofthe treated specimens,and LSP introduces a great compressive residual stress in the surfaces of the welding joints.The residual stress in the welding undercut may reach-564.37± 9.85 MPa,while the surface hardnesses are increased.The combined actions of high structure refinement and high compressive residual stress are the main causes of the fatigue performance improvements,which blocks fatigue crack initiations and reduces crack growth rates.关键词
激光冲击强化/钛合金/激光焊/残余应力/疲劳性能Key words
laser shock processing(LSP)/titanium alloy/laser welding/residual stress/fatigue performance分类
信息技术与安全科学引用本文复制引用
黄潇,曹子文,常明,邹世坤..激光冲击强化对TC4钛合金单面修饰激光焊接接头疲劳性能的影响[J].中国机械工程,2018,29(1):104-109,6.
