TC21钛合金热压缩本构方程及热加工图  

Constitutive equation and thermal processing map of thermal compression for TC21 titanium alloy

作　　者：孙越 孙勇 杨勇 凌云汉 袁超 黄达力 Sun Yue;Sun Yong;Yang Yong;Ling Yunhan;Yuan Chao;Huang Dali(Beijing Research Institute of Mechanical&Electrical Technology Co.,Ltd.CAM,Beijing 100083,China)

机构地区：[1]中国机械总院集团北京机电研究所有限公司,北京100083

出　　处：《锻压技术》2023年第4期242-248,共7页Forging & Stamping Technology

基　　金：国家重点研发计划资助项目(2022YFB3706904)。

摘　　要：为准确获得TC21钛合金塑性加工的变形特征和热加工条件,合理设计锻造工艺参数,利用Gleeble-3500热模拟机进行等温恒应变速率热压缩试验,研究了TC21钛合金在变形温度为830~1010℃、应变速率为0.01~10 s^(-1)条件下的热变形行为,采用Arrhenius双曲线正弦函数推导出TC21钛合金本构方程。并基于动态材料模型(Dynamic Materials Model,DMM)建立了TC21钛合金的热加工图。结果表明,在本试验的变形条件下,该合金的流变应力随着变形温度的降低和应变速率的升高而增大。根据热加工图确定了合金的热加工安全区域为:变形温度为900~940℃、应变速率为0.01~0.05 s^(-1)和变形温度为970~1010℃、应变速率为0.01~0.08 s^(-1)。In order to accurately obtain the plastic processing deformation characteristics and thermal processing conditions of TC21 titanium alloy,and reasonably design the forging process parameters,the Gleeble-3500 thermal simulator was used to conduct isothermal thermal compression tests with constant strain rate,and the deformation temperatures of TC21 titanium alloy was 830-1010℃,the thermal deformation behavior under the condition of strain rates of 0.01-10 s^(-1)was studied,the constitutive equation of TC21 titanium alloy was derived by using the Arrhenius hyperbolic sine function.Based on the dynamic materials model(DMM),the thermal processing map of TC21 titanium alloy was established.The results show that under the deformation conditions of this test,the flow stress of alloy increases with the decreasing of deformation temperature and the increasing of strain rate.According to the thermal processing map,the thermal processing safety zone of alloy is determined as:the deformation temperature of 900-940℃,the strain rate of 0.01-0.05 s^(-1)and the deformation temperature of 970-1010℃,the strain rate of 0.01-0.08 s^(-1).

关 键 词：钛合金 本构方程 流变应力 热变形行为 热加工图 

分 类 号：TG146.2[一般工业技术—材料科学与工程]