锻压技术

脉冲电流对30CrMnSiA合金钢流动应力的影响

英文标题：Influence of pulse current on flow stress of 30CrMnSiA alloy steel

作者：李泽宇徐晓王磊夏琴香

分类号：TG115.5；TH142.2

出版年,卷(期):页码：2019,44(2):74-80

摘要：

30CrMnSiA合金钢的室温成形性能差，为探究30CrMnSiA材料电流辅助成形的可行性，基于不同试验参数的电流辅助拉伸试验，研究了温度及脉冲电流参数（电流密度、脉冲占空比和频率）对30CrMnSiA流动应力的影响规律。研究表明：30CrMnSiA的强度及伸长率随温度及电流密度的升高而下降，受脉冲占空比和频率影响不大；脉冲电流能抑制动态应变时效的强化作用，并促进碳化物的析出，使材料塑性下降。基于Voce模型基础，建立了考虑应变速率、温度及脉冲电流参数影响的30CrMnSiA电流辅助流动应力模型。利用该模型计算的结果与试验值吻合较好，说明该模型能准确预测材料在电流辅助条件下的流动应力。

The formability of 30CrMnSiA alloy steel at room temperature is poor. In order to explore the feasibility of electricallyassisted forming (EAF) of 30CrMnSiA, the influences of temperature and pulse current parameters (current density, pulse duty ratio and frequency) on flow stress of 30CrMnSiA were investigated by electricallyassisted uniaxial tensile tests under different test parameters. The results indicate that the strength and elongation of 30CrMnSiA decrease with the increase of temperature and current density and are not affected by pulse duty ratio and frequency. The strengthening effect of dynamic strain aging (DSA) is inhibited by pulse current to promote the precipitation of carbides and reduce the plasticity of 30CrMnSiA. Furthermore, based on the Voce model, a flow stress model of 30CrMnSiA considering the influence of strain rate, temperature and pulse current parameters is established, and the flow stress calculated by the model fits the experimental data well. Therefore, the flow stress under electricallyassisted condition for 30CrMnSiA can be predicted accurately by this model.

基金项目：

基金项目:广州市科技计划项目(201804010135)

作者简介：李泽宇（1993-），男，硕士研究生 Email：714454358@qq.com 通讯作者：夏琴香（1964-），女，博士，教授 Email：meqxxia@scut.edu.cn

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