摘要
以锻造TA18钛合金棒材为研究对象,利用Gleeble-3800型热模拟试验机模拟感应加热升温过程,在变形温度为820~900℃,应变速率为0.1~10 s^(-1),变形量为80%的条件下进行了热压缩试验,研究其高温力学行为。基于Arrhenius型本构方程和Z参数建立了TA18钛合金高温流变峰值应力模型,采用动态材料模型绘制热加工图,根据Prasad失稳判据构建了塑性失稳图。结果表明,应变速率一定时TA18钛合金流变应力随着变形温度升高而减小,变形温度一定时呈现出正应变速率敏感性;在应变速率≥1 s^(-1)条件下,TA18钛合金表现出动态再结晶行为;Arrhenius方程能较好地预测TA18钛合金在不同工艺参数下的峰值应力变化规律;在变形温度860~880℃、应变速率3~10s^(-1)区间内,TA18钛合金具有较好的热加工性能。
The research object is TA18 titanium alloy rod processed by forging.Using the Gleeble-3800 thermal simulation testing machine and simulating the process of induction heating,hot compression experiments were conducted at deformation temperatures of 820-900℃,strain rates of 0.1-10 s^(-1),and deformation amount of 80%to investigate their high-temperature mechanical behavior.An Arrhenius-type constitutive equation and Z parameter were used to establish a peak stress model for the high-temperature of TA18 titanium alloy.A dynamic material model was used to plot the thermal processing map,and a plastic instability map was constructed based on the Prasad instability criterion.The results indicate that,at a constant strain rate,the flow stress of TA18 titanium alloy decreases with increasing deformation temperature.Besides,TA18 titanium alloy shows positive strain rate sensitivity at a constant deformation temperature.When the strain rate is above or equal to 1 s^(-1),TA18 titanium alloy exhibits significant dynamic recrystallization behavior.The Arrhenius equation can effectively predict the variation of peak stress under different process parameters for TA18 titanium alloy.TA18 titanium alloy exhibits good hot workability within the deformation temperature range of 860-880℃and the strain rate range of 3-10 s^(-1).
作者
曹祖涵
应扬
郭荻子
李磊
龚玮杰
Cao Zuhan;Ying Yang;Guo Dizi;Li Lei;Gong Weijie(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)
出处
《钛工业进展》
CAS
2024年第4期1-8,共8页
Titanium Industry Progress
基金
陕西省财政厅动力专项(YK22C-1-2)
西安市高校院所科技人员服务企业项目(22GXFW-0139)
陕西省重点研发计划项目(2022GY-286)。
关键词
TA18钛合金
感应加热
本构方程
热加工图
微观组织
TA18 titanium alloy
induction heating
constitutive equations
thermal processing map
microstructure
作者简介
通信作者:曹祖涵(1997-),男,助理工程师。
