基于数值模拟的TA1等温等通道角挤压变形行为与试验研究  

Experimental study on deformation behavior of TA1 isothermal equal channel angular pressing based on numerical simulation

作　　者：赵军 李奋强 许铖斌 张长铧 

机构地区：[1]厦门理工学院材料科学与工程学院,福建厦门361024

出　　处：《塑性工程学报》2017年第6期55-60,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51371155)

摘　　要：采用Deform-3D对TA1等通道角挤压过程进行数值模拟,分析材料变形过程的流动规律、等效应力应变分布情况及载荷变化情况。结果表明,材料在模具通道转角处发生剧烈塑性变形,成形载荷迅速增大,整个挤压过程载荷波动剧烈,截面上应力应变分布不均匀。进行了等温等通道角挤压变形试验,结果表明,TA1在400℃下经等通道角挤压后零件表面光顺,无起皱破裂现象;材料的抗拉强度由挤压前404 MPa提高到585.24 MPa,材料显微硬度由211.49 HV提高到261.32 HV。金相结果显示,粗大的原始晶粒挤压后明显细化,在晶粒内部存在少量变形孪晶。The equal channel angular pressing process of TA1 was numerical simulated by using the finite element software Deform-3 D,and the flow law of material deformation process,the equivalent stress and strain distribution,the load change in the deformation process were analyzed. The results show that severe plastic deformation（ SPD） occurs at the channel corner of the die,the forming load increases rapidly,the load during the whole extrusion process fluctuates violently,and the distributions of stress and strain of the cross section are uneven. The isothermal equal channel angular pressing experiment was carried out. Experimental results show that the TA1 parts obtained by equal channel angular pressing at 400 ℃ has smooth surface and there is no wrinkle and rupture phenomenon. The tensile strength increases from 404 MPa to 585. 24 MPa and the material micro-hardness also increases from 211. 49 HV to 261. 32 HV after extrusion. Optical microstructure pictures show that the coarse grain is refined obviously after extrusion,and there is a small amount of deformation twins in the elongated grains.

关 键 词：等通道角挤压 工业纯钛 通道角度 大塑性变形 变形行为 

分 类 号：TG376[金属学及工艺—金属压力加工]