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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。
It is a commonly used method to refine grains by the isometric channel extrusion method. This method is widely used for easy forming materials at room temperature, but it is still in the research stage for difficult-to-process titanium alloys. The traditional experimental method of titanium alloy channel corner extrusion, the workload, high cost. In this paper, the numerical simulation technique was used to analyze the corrosion resistance of TC4 titanium alloy at 350 ℃, BC path of 1, 2, 4, 8 times and at different initial extrusion temperature, friction coefficient and extrusion speed The results show that the effect of grain refinement is better under the extrusion speed of 0.12 and 6mm · s-1 with 4 passes. .