锻压技术

挤压态Ti-46Al-(V,Cr,Ni)合金的高温变形行为

英文标题：Hot deformation behavior of extruded Ti-46Al-(V,Cr,Ni) alloy

分类号：TG146.2

出版年,卷(期):页码：2019,44(7):158-164

摘要：

采用热/力物理模拟的方法，分析了挤压态Ti-46Al-(V,Cr,Ni)合金的热变形行为及组织演变，获得了热加工窗口，并根据计算分析得到的能量耗散效率和失稳判据，建立了挤压态Ti-46Al-(V,Cr,Ni)合金的热加工图。随着热变形温度的升高，合金组织中再结晶γ晶粒尺寸逐渐增加，γ晶粒的体积分数先增加后减少，而α2/γ层片晶团的体积分数与γ晶粒呈相反的趋势。过低或过高的变形温度均会对变形组织均匀性产生不利影响。综合考虑热加工窗口、热加工图、合金组织的研究结果，确定挤压态Ti-46Al-(V,Cr,Ni)合金的最佳热变形工艺条件为(1160~1220 ℃)/(0.004~0.02 s-1)。

The hot deformation behavior and microstructural evolution of the extruded Ti-46Al-(V,Cr,Ni) alloy were investigated by the thermal/force physics simulation method, and the hot working window was obtained. Based on the energy dissipation efficiency obtained by the calculation analysis and the instability criterion, the hot working diagram of the extruded Ti-46Al-(V,Cr,Ni) alloy was established. Then, with the increasing of hot deformation temperature, the recrystallization γ grain size increases, and the volume fraction of γ grain increases first and then decreases, but the volume fraction of α2/γ lamellar colonies is opposite to that of γ grains. Therefore, the lower or higher deformation temperature adversely affects the uniformity of deformed microstructure. Comprehensive consideration of the research results of hot processing window, hot working diagram and alloy structures, the best hot deformation conditions of the extruded Ti-46Al-(V,Cr,Ni) alloy are (1160-1220 ℃) and (0.004-0.02 s-1), respectively.

基金项目：

国家自然科学基金资助项目（51471056）

关红（1968-），女，学士，高级工程师，E-mail：1277479262@qq.com；通讯作者：孔凡涛（1971-），男，博士，教授，E-mail：kft@hit.edu.cn

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