【摘要】 采用刚塑性有限元法,对Ti60合金锭坯镦粗过程进行了有限元模拟,重点分析了锭坯各部分应力、应变的分布变化规律.结果表明:锻锤对锭坯端面的温降有较大的影响,应尽量避免长时间接触,以免端表面塑性严重下降,产生裂纹,间断镦锻有利于改善镦粗效果;端面、表面是高应力区,是加工缺陷的多发区,尤其是端面与表面交界处同时又是高应变区,极易出现缺陷,倒角处理有缓解作用;端面附近存在较大的变形死区,需要在后续工艺改善该区变形量,换向镦拔可以提高锭坯整体的变形均匀度,有利于成品的综合性能.本文模拟结果可以为钛合金镦粗工艺设计提供参考.更多还原

【Abstract】 The upset process of Ti60 alloys is investigated using thermal-mechanical coupled simulations based on the rigid-plastic finite element method. The stress and strain distribute is detail discussed,The results showed that: hammer has a great influence on temperature distribution of the billet’s end-surface,it should try to avoid long time contacting,so as not to declining the plastic of the end-surface seriously. discontinuity forging is benefit for the microstructure of bar. the surface of bar is high stress area and the high density defect areas;especially the junction of end-face and surface is a high strain zone which is easily producing defects. Chamfer can reduce this effects. There are large rigid zone near the end-face,reversing the directions of the forging can improve this areas’ s performance,especially. In this paper,the simulation results can provide reference for the titanium alloy forging process design.更多还原