Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy
AbstractThe isothermal compression experiment of as-rolled Ti55 alloy was carried out on a Gleeble-3800 thermal simulation test machine at the deformation temperature range of 700–1050 °C and strain rate range of 0.001–1 s−1. The hot deformation behavior and the microstructure evolution were analyzed during thermal compression. The results show that the apparent activation energy Q in α+β dual-phase region and β single-phase region were calculated to be 453.00 KJ/mol and 279.88 KJ/mol, respectively. The deformation softening mechanism was mainly controlled by dynamic recrystallization of α phase and dynamic recovery of β phase. Discontinuous yielding behavior mainly occurred in β phase region, which weakened gradually with the increase of deformation temperature (>990 °C) and strain rate (0.01–1 s−1) in β phase region. The processing map derived from Murty’s criterion was more accurate in predicting the hot workability than that derived from Prasad’s criterion. The optimized hot working window was 850–975°C/0.001–1 s−1, in which sufficient dynamic recrystallization occurred and α + β-transus microstructure was obtained. When deformed at higher temperature (≥1000 °C), coarsened lath-shape β-transus microstructure was formed, while deformed at lower temperature (≤825 °C) and higher strain rate (≥0.1 s−1), the dynamic recrystallization was not sufficient, thus flow instability appeared because of shear cracking. View Full-Text
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Wu, F.; Xu, W.; Jin, X.; Zhong, X.; Wan, X.; Shan, D.; Guo, B. Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy. Metals 2017, 7, 319.
Wu F, Xu W, Jin X, Zhong X, Wan X, Shan D, Guo B. Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy. Metals. 2017; 7(8):319.Chicago/Turabian Style
Wu, Fengyong; Xu, Wenchen; Jin, Xueze; Zhong, Xunmao; Wan, Xingjie; Shan, Debin; Guo, Bin. 2017. "Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy." Metals 7, no. 8: 319.
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