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张治民,任璐英,薛勇,吴耀金,王强,徐健,张慧芳.热等静压Ti-6Al-4V钛合金热变形微观组织演变研究[J].稀有金属材料与工程(英文),2019,47(3):820~826.[Zhang Zhimin,Ren Luying,Xue Yong,Wu Yaojin,Wang Qiang,Xu Jian and Zhang Huifang.Microstructure of Hot Isostatic Pressing Ti-6Al-4V Alloy after Hot Deformation[J].Rare Metal Materials and Engineering,2019,47(3):820~826.]
Microstructure of Hot Isostatic Pressing Ti-6Al-4V Alloy after Hot Deformation
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Received:June 25, 2018  Revised:August 09, 2018
Key words: Ti-6Al-4V Alloy  HIP  hot compression  microstructure evolution
Foundation item:国家自然科学基金面上项目(项目号51675492)
Author NameAffiliation
Zhang Zhimin,Ren Luying,Xue Yong,Wu Yaojin,Wang Qiang,Xu Jian and Zhang Huifang  
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      The high temperature thermal compression test was carried out by using Gleeble-1500 thermal simulator for the Ti-6Al-4V alloy prepared by hot isostatic pressing process in the temperature range of 950~1050°C, strain rate range of 0.01~1s-1 and engineering compressive strain of 70%. The effect of deformation temperature and strain rate on the microstructure evolution of the alloy was investigated. The results showed that the microstructure was mainly composed of corase β grains and needle and lath martensite, which exhibited typical microstructure character in β-phase filed hot deformation after water quenching. The β transformed lamellar microstructure in the β grain form basketweave structure with certain craystall misorientation. The microstructure analysis illustrated that dynamic recovery and dynamic recrystallization occtured during thermal compression. When the condition of 950℃,0.01s-1, deformation mechanism was dynamic recrystallization and the uniform equiaxed β grain with β transformed microstructure was obtained. With increasing of strain rate, β grains were elongated to long strip in the direction perpendicular to the compression direction, and the β transformed lamellar microstructure was refined, which was attributed to that the dynamic recovery was the main deformation mechanism. As the temperature increased, the size of β grains and β transformed lamellar microstructure increased. However, the strip shaped β grains were still maintained.