Paper Title:

Influences of Heat Treatment on Microstructure and Creep Properties of Ti6Al4V Alloy

Periodical Materials Science Forum (Volumes 610 - 613)
Main Theme Materials Research
Edited by Zhongwei Gu, Yafang Han, Fusheng Pan, Xitao Wang, Duan Weng and Shaoxiong Zhou
Pages 658-662
DOI 10.4028/www.scientific.net/MSF.610-613.658
Citation Su Gui Tian et al., 2009, Materials Science Forum, 610-613, 658
Online since January 2009
Authors Su Gui Tian, Xian Yu Bao, Zhong Gang Zhao, Yang Liu, Li Qing Chen, Xiang Hua Liu
Keywords Creep, Deformation Mechanism, Microstructure, T6-Heat Treatment, Ti6Al4V Alloy
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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 +  phases, which results in the alloy displaying a higher strain rate and shorter creep life under the test condition of 575 MPa and 400°C. 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  and /phases, and signification amount of the bundle-like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 matrix in the alloy. During creep, the deformed mechanism of the alloy was the double orientations slip of and dislocations activated on the pyramidal planes in  phase.