Ti-1023钛合金热挤压过程应力场及组织演变模拟  

Microstructure Evolution and Stress Field Simulation of Ti-1023 Titanium Alloy during Isothermal Extrusion Process

作　　者：余新平[1] 潘光永 

机构地区：[1]浙江广厦建设职业技术学院信息与控制工程学院

出　　处：《特种铸造及有色合金》2016年第8期800-803,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51164029)

摘　　要：针对Ti-1023钛合金,基于DEFORM-3D有限元模拟软件,分析不同坯料温度、挤压速度、模具摩擦因子等工艺参数对其挤压成形过程应力分布变化的影响,同时结合元胞自动机法(CA)模拟了挤压过程的微观组织演变规律。结果表明,挤压件在不同的挤压变形条件下,挤压出入模口位置的应力较为集中,其中挤压过程的摩擦力对应力分布的影响范围更广;微观组织模拟可知,随着挤压变形量增加,合金在稳定挤压阶段发生了动态再结晶,晶粒细化,动态再结晶产生的软化效应使挤压载荷从峰值下降并趋于相对稳定;观察不同挤压速度对微观组织演变的影响可知,在相同的挤压变形量下,随着挤压速度增加,平均晶粒尺寸减小。Effects of temperature,extrusion speed and friction coefficient on the stress distribution in the extrusion forming process of Ti-1023 alloy were simulated by DEFORM-3Dfinite element software.The microstructure evolution law of the Ti-1023 alloy during extrusion process was simulated by the cellular automaton（CA）method.The results show that the stress distribution under different extrusion conditions is different,and the stress concentration appears in the extrusion die gate,and frictional force has a relatively effect on stress distribution.The microstructure simulation shows that the dynamic recrystallization in the alloy can be observed at the stable extrusion stage with the increase of the extrusion deformation,and the grain size is refined.The dynamic recrystallization softening effect leads to the extrusion load decrease from peak and to be relatively stable.The average grain size is decreased with the extrusion speed increase at the same deformation rate.

关 键 词：TI-1023钛合金 挤压 应力 组织演变 

分 类 号：TG379[金属学及工艺—金属压力加工]