Ductile fracture behavior of TA15 titanium alloy at elevated temperatures

被引:9
作者
Yang, Lei [1 ]
Wang, Bao-yu [1 ]
Lin, Jian-guo [1 ,2 ]
Zhao, Hui-jun [1 ]
Ma, Wen-yu [1 ]
机构
[1] Univ Sci & Technol Beijing, Sch Mech Engn, Beijing 100083, Peoples R China
[2] Univ London Imperial Coll Sci Technol & Med, Dept Mech Engn, London SW7 2AZ, England
基金
高等学校博士学科点专项科研基金;
关键词
titanium alloys; ductile fracture; elevated temperatures; stress triaxiality; microstructure; STRESS-TRIAXIALITY; HOT-WORKING; TI-6AL-4V; CAVITATION; STRAIN; FATIGUE; TI-6AL-2ZR-1MO-1V; MICROSTRUCTURES; TECHNOLOGY; PREDICTION;
D O I
10.1007/s12613-015-1171-2
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
To better understand the fracture behavior of TA15 titanium alloy during hot forming, three groups of experiments were conducted to investigate the influence of deformation temperature, strain rate, initial microstructure, and stress triaxiality on the fracture behavior of TA15 titanium alloy. The microstructure and fracture surface of the alloy were observed by scanning electronic microscopy to analyze the potential fracture mechanisms under the experimental deformation conditions. The experimental results indicate that the fracture strain increases with increasing deformation temperature, decreasing strain rate, and decreasing stress triaxiality. Fracture is mainly caused by the nucleation, growth, and coalescence of microvoids because of the breakdown of compatibility requirements at the alpha/beta interface. In the equiaxed microstructure, the fracture strain decreases with decreasing volume fraction of the primary alpha-phase (alpha(p)) and increasing alpha/beta-interface length. In the bimodal microstructure, the fracture strain is mainly affected by alpha-lamella width.
引用
收藏
页码:1082 / 1091
页数:10
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