论文部分内容阅读
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。
Based on DEFORM-3D finite element simulation software, the influence of different process parameters such as temperature, extrusion speed and die friction factor on the stress distribution during the extrusion process was analyzed for Ti-1023 titanium alloy. At the same time, (CA) simulated the microstructure evolution of the extrusion process. The results show that under different extrusion deformation conditions, the stress of extruding die is more concentrated, and the influence of friction force on stress distribution is more extensive. The microstructure simulation shows that with the extrusion The amount of deformation was increased and the alloy recrystallized dynamically in the steady extrusion stage. The softening effect of grain refinement and dynamic recrystallization decreased the compressive load from the peak and tended to be relatively stable. The effect of different extrusion rates on microstructure The evolutionary effect shows that at the same extrusion deformation, the average grain size decreases as the extrusion rate increases.