TC4钛合金薄壁筒形件反挤压成形及微观组织演化  

Backward extrusion and microstructure evolution of TC4 titanium alloy thin-walled cylinders

作　　者：李洪波[1] 王琳[1] 田锋 徐蒙蒙 LI Hong-bo;WANG Lin;TIAN Feng;XU Meng-meng(Key Laboratory of Advanced Forging&Stamping Technology and Science,Ministry of Education,Yanshan University,Qinhuangdao 066004,China;School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学先进锻压成形技术与科学教育部重点实验室,河北秦皇岛066004 [2]燕山大学机械工程学院,河北秦皇岛066004

出　　处：《塑性工程学报》2021年第10期19-26,共8页Journal of Plasticity Engineering

摘　　要：利用Thermecmaster-Z型热模拟试验机进行温度为850~1050℃、应变速率为0.01~1 s^(-1)的高温热压缩实验,分别构建了TC4钛合金在α+β两相区与β单相区的本构方程和动态再结晶模型。采用DEFORM-3D有限元分析软件对不同条件下TC4钛合金薄壁筒形件反挤压成形时的载荷-行程曲线、动态再结晶百分数及晶粒尺寸分布进行了模拟,并与实验进行对比。结果表明,在变形温度为1000℃,反挤压速度为100 mm·s^(-1)时,得到的反挤压件晶粒尺寸最小。此外,反挤压实验与数值模拟所获得的载荷-行程曲线基本相符,最大相对误差约8.7%;反挤压后各部位金相组织及晶粒尺寸差异较大,但均小于最大相对误差22.8%。The constitutive equation and dynamic recrystallization model of TC4 titanium alloy inα+βtwo-phase region andβsinglephase region were established by Thermecmaster-Z thermal simulation testing machine at 850-1050℃and strain rate of 0.01-1 s^(-1).The load-displacement curves,dynamic recrystallization percentage and grain size distribution of TC4 titanium alloy thin-walled cylindrical parts in backward extrusion were simulated under different conditions using DEFORM-3D finite element analysis software,and compared with experiment.The results show that when the deformation temperature is 1000℃and the extruded speed is 100 mm·s^(-1),the grain size of the extruded parts is the smallest.In addition,the load-displacement curves obtained by the backward extrusion test are basically consistent with the numerical simulation,and the maximum relative error is about 8.7%.After backward extrusion,the microstructure and grain size of each part are quite different,but all less than the maximum relative error of 22.8%.

关 键 词：TC4钛合金 薄壁筒形件 微观组织 反挤压 DEFORM-3D 

分 类 号：TG376[金属学及工艺—金属压力加工]