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,2019,47(3):820~826.[Zhang Zhimin,Ren Luying,Xue Yong,Wu Yaojin,Wang Qiang,Xu Jian,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.]
热等静压Ti-6Al-4V钛合金热变形微观组织演变研究
投稿时间:2018-06-25  修订日期:2018-08-09
中文关键词:  Ti-6Al-4V合金  热等静压  高温压缩  组织演变
基金项目:国家自然科学基金面上项目(项目号51675492)
中文摘要:
      采用Gleeble-1500热模拟试验机对热等静压态Ti-6Al-4V钛合金在温度950~1050℃、应变速率0.01~1s-1条件下进行了热模拟压缩实验,研究了变形温度、应变速率对其显微组织的影响规律。结果表明:热等静压态Ti-6Al-4V钛合金在950℃以上变形后淬火组织以粗大的β晶粒与针状及板条马氏体组成,具有典型的β相区变形组织特征。β转变组织形成交错的网篮结构并具有特定的取向关系。变形过程中,发生了动态再结晶,并伴随着动态回复现象。在950℃、0.01s?1条件下,以动态再结晶占据主导,得到均匀等轴β转变组织。随应变速率增大,以动态回复为主,β晶粒沿金属流动方向拉长,β转变组织得到细化。随温度升高,β晶粒变粗大,并仍然存在拉长变形带。同时,β转变组织有一定程度的粗化。
Microstructure of Hot Isostatic Pressing Ti-6Al-4V Alloy after Hot Deformation
英文关键词:Ti-6Al-4V Alloy  HIP  hot compression  microstructure evolution
英文摘要:
      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.
作者单位E-mail
张治民 中北大学 nucforge@126.com 
任璐英 中北大学 dhforu@163.com 
薛勇 中北大学  
吴耀金 中北大学  
王强 中北大学  
徐健 国防科技工业复杂构件挤压成形技术创新中心  
张慧芳 国防科技工业复杂构件挤压成形技术创新中心  
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