304L不锈钢等径角挤压有限元模拟研究

Finite Element Simulation Study on Equal Channel Angular Extrusion of 304L Stainless Steel

在不同温度下对304不锈钢进行等径角挤压有限元模拟,对挤压变形特点及不同温度下的挤压力及等效应力进行对比分析。结果表明,800℃时的最大挤压力是最低的,该温度下挤压对模具有利。工件温度在800℃时,其等效应力最大为267 MPa,在400℃时其等效应力最小为224 MPa,最大变化幅度为43 MPa,整体上看工件等效应力受温度影响较小。304不锈钢在低温条件下进行等径角挤压变形后加工硬化非常严重,随着挤压温度进一步增加,拉伸曲线形貌基本上一致。

The finite element simulation of 304 stainless steel was carried out at different temperatures and the extrusion deformation characteristics and the extrusion force and equivalent stress at different temperatures were compared.analysis.It was found that in the above extrusion temperature,the maximum pressing force at 800℃is the lowest at all temperatures,and extrusion at this temperature is advantageous for the mold.When the workpiece temperature is 800℃,the equivalent stress is 267 MPa.At 400℃,the equivalent stress is 224 MPa,and the maximum variation is 43 MPa.The overall equivalent stress of the workpiece is less affected by temperature.After 304 stainless steel is subjected to equal-diameter angular deformation under low temperature conditions,the work hardening is very serious.As the extrusion temperature is further increased,the tensile curve morphology is basically the same.