Influences of Heat Treatment on Microstructure and Creep Properties of Ti-6Al-4V Alloy
By means of the measurement of creep curves and microstructure observation, the influence of T6 heat treatment on the microstructure and creep properties of the wrought Ti-6Al-4V the alloy has been investigated. The experimental results showed that the microstructure of the wrought alloy consists of the strip-like α + β phases, which results in the alloy displaying a higher strain rate and shorter creep life under the test condition of 575 MPa and 400℃. After T6 treatment, the creep life of the alloy at same conditions enhanced to 548 h from 66 h. Microstructure of T6 treated alloy consisted of the primary α and α/β phases, and signification amount of the bundle-like β phase precipitated along the different orientations in the grains, this is a main reason of enhancing creep life of the alloy. During forging, the denser dislocation rows were activated in the local region of the α matrix in the alloy. During creep, the deformed mechanism of the alloy was the double orientations slip of <a> and <a+c> dislocations activated on the pyramidal planes in α phase.
Ti-6Al-4V alloy T6 Heat Treatment Microstructure Creep Deformation Mechanism
Sugui TIAN Xianyu BAO Zhonggang ZHAO Yang LIU Liqing CHEN Xianghua LIU
Department of Materials Science and Engineering, Shenyang University of Technology,Shenyang 110078, State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004,China
国际会议
重庆
英文
658-662
2008-06-09（万方平台首次上网日期，不代表论文的发表时间）