Transactions of Materials and Heat Treatment

Title：Influence of pulse current on flow stress of 30CrMnSiA alloy steel

Authors： Li Zeyu Xu Xiao Wang Lei Xia Qinxiang

Unit： (School of Mechanical and Automotive Engineering South China University of Technology Guangzhou 510640 China)

KeyWords： pulse current electricallyassisted forming 30CrMnSiA flow stress model Voce model

ClassificationCode：TG115.5；TH142.2

year,vol(issue):pagenumber：2019,44(2):74-80

Abstract：

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.

Funds：

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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