摘要
在Thermecmaster-Z型热加工模拟试验机上对TC6钛合金在温度800℃～1040℃,应变速率10s～50s、最大变形程度50%条件下的高温流动应力变化规律进行了研究,进而分析了变形参数对微观组织的影响。结果表明合适的工艺参数是变形温度为920℃～950℃,应变速率为1.0s-1～1×10-3s-1。在变形过程中,变形温度对α相体积分数有着显著影响,应变速率对α相体积分数影响不大,但对α相晶粒的形态有一定的影响。最后在分析变形温度、变形程度和应变速率对流动应力影响规律的基础上提出了1种本构关系模型,其拟合精度较高,为进行钛合金高温变形过程的数值模拟打下了较好的基础。
Hot compressive deformation of TC6 titanium alloy was carried out with the Hot-simulator of Thermecmaster-Z over the range of deformation temperature from 800degreesC to 1 040degreesC, strain rate from 10(-3)s(-1) to 50s(-1), and maximum deformation to 50%. the experimental results showed that the optimal process parameters are 920degreesC similar to 950degreesC for the deformation temperature and 1.0s(-1) similar to 1 x 10(-3)s(-1) for the strain-rate. During thermal deformation, the deformation temperature affects the volume fraction of alpha-phase obviously and the strain rate has few effects on the morphology of alpha-phase for the TC6 titanium alloy. A constitutive equation with high precision based on the regressive analysis presented here will be beneficial to the FEM simulation of thermal deformation for TC6 titanium alloy.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2003年第6期447-450,共4页
Rare Metal Materials and Engineering
基金
国家"973"(G2000067206)
教育部优秀青年教师教学科研奖励基金
航空基金(99H53109)资助项目
关键词
TC6钛合金
本构关系
流动应力
高温变形
TC6 titanium alloy
constitutive equation
flow stress
thermal deformation
