摘要
通过等通道转角挤压法来细化晶粒是目前比较常用的方法,此法对室温下易成形材料应用较广,但对于难加工材料钛合金还处于研究阶段。传统实验法对钛合金等通道转角挤压时,工作量大、成本高。本文利用数值模拟技术分析了TC4钛合金在350℃、BC路径下1,2,4,8道次及在不同的初始挤压温度、摩擦系数及挤压速度下,等通道转角挤压过程中的载荷、温度场变化、等效应变场及微观组织的变化情况,结果显示,在挤压4道次、摩擦系数0.12及6mm·s-1的挤压速度下的晶粒细化效果较好。
Through the method of equal channel angular extrusion to get the grain refinement is commonly used, which is wildly used in easily molding materials, but as for difficult-to-cut material titanium alloy, the using is still in re- search stage. When titanium alloy extruded by equal channel angular extrusion using traditional experimental method, the workload is heavy and the cost is high. Using numerical simulation, the change of load, temperature field, equivalent stress field, strain field and microstructure when equal channel angular extrusion under temperature of 350℃, path of 1, 2, 4, 8 times of equal channel angular extrusion process, different initial extrusion temperatures, friction coefficients and extrusion speeds of TC4 titanium alloy were analyzed. The results show that the effect of grain refine- ment after 4 passes extrusion when friction coefficient is 0.12 and extrusion speed is 6 mm ·s^-1 is good.
出处
《锻压技术》
CAS
CSCD
北大核心
2013年第5期185-189,共5页
Forging & Stamping Technology
基金
四川工程职业技术学院2013年院级科研项目资助(2013-06)
