Ti-5Mo-5V-1Cr-3Al合金的热压缩变形行为研究  

Research on Hot Compressive Behavior of Ti-5Mo-5V-1Cr-3Al Alloy

作　　者：崔雪飞[1] 米绪军[2] 林晨光[1] 惠松晓 魏衍广[1] 陶海明[1] 

机构地区：[1]北京有色金属研究总院粉末冶金及特种材料研究所,北京100088 [2]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《材料工程》2013年第12期19-26,共8页Journal of Materials Engineering

基　　金：国家国际科技合作专项项目资助(2012DFG51540)

摘　　要：采用恒应变速率热压缩模拟实验,对Ti-5Mo-5V-1Cr-3A1（简称1Cr）钛合金在应变速率0.001～1s-1、变形温度700～900℃条件下进行研究.结果表明：该材料的流变应力对温度与应变速率敏感：当变形温度为700～800℃时,真应力-真应变曲线呈现动态再结晶单曲线特征;当变形温度为800～900℃时,低应变速率（0.001s-1）的真应力-真应变曲线呈现动态再结晶多应力峰值曲线特征,高应变速率（0.01～1s-1）的真应力-真应变曲线呈现动态回复曲线特征.1Cr合金在等温压缩变形时的流变行为可用包含Zener-Holomon参数的Arrhenius本构方程描述,变形激活能为456kJ/mol.金相结果显示,材料在热压缩过程中的动态行为除了与变形速率、变形温度等加工参数相关外,也与相应温度、变形速率下材料的组织及相结构有关.合金在低应变速率0.001s 1下热压缩变形时,在接近相变点或以上（800～900℃）温度范围内仍呈现动态再结晶行为,这与材料在此阶段发生的应变诱发马氏体转变密切相关,马氏体相的析出促使材料在热变形时趋向于发生动态再结晶行为.Isothermal compression test was carried out for Ti-5Mo-5V-1Cr-3A1 （abbreviated as 1Cr ） alloy in the temperature range of 700-900℃ and in the strain rate range of 0. 001-1s 1. The results show that the flow stress is sensitive to the deformation temperature and the strain rate. Dynamic re- crystallization occurs in the temperature range of 700-800℃. In the temperature range of 800-900℃, multi-peaks stress dynamic recrystallization exhibits in the low strain rate of 0. 001s 1 and dynamic re- covery exhibits in the strain rate range of 0.01-1s-1. The flow stress behaviors of Ti-5Mo-5V-1Cr-3A1 alloy during the isothermal compression could be expressed by the Arrhenius constitutive equation in- cluding Zener-Holomon parameters. The hot deformation activation energy is 456kJ/mol. The metal- lographic results indicate that the dynamic behavior of the material in hot compression process is af- fected by not only the rate and the temperature of the deformation, but also the microstructure and phase structure of the material. During hot compression deformation under a low strain rate of 0. 001s-1, the alloy presents the dynamic recrystallization behavior even near the phase transition point or the higher temperature （800-900℃）, which is closely related to the martensitic transforma tion induced by the strain. The precipitation of the martensite promotes dynamic recrystallization be- havior during the hot deformation.

关 键 词：Ti-5Mo-5V-1Cr-3Al合金 等温压缩 流变应力 应变诱发马氏体 

分 类 号：TG146.23[一般工业技术—材料科学与工程]