Fe-6.5%Si钢中温变形过程本构方程

doi:10.12068/j.issn.1005-3026.2019.01.009

东北大学学报:自然科学版 ›› 2019, Vol. 40 ›› Issue (1): 43-47.DOI: 10.12068/j.issn.1005-3026.2019.01.009

Fe-6.5%Si钢中温变形过程本构方程

梅瑞斌^{1, 2}，包立¹，李长生²，刘相华²

(1. 东北大学秦皇岛分校资源与材料学院，河北秦皇岛066004; 2. 东北大学轧制技术及连轧自动化国家重点实验室，辽宁沈阳110819)

收稿日期:2017-04-29 修回日期:2017-04-29 出版日期:2019-01-15 发布日期:2019-01-28
通讯作者: 梅瑞斌
作者简介:梅瑞斌(1979-)，男，河南登封人，东北大学秦皇岛分校副教授；李长生(1964-)，男，黑龙江七台河人，东北大学教授，博士生导师; 刘相华(1953-)，男，黑龙江双鸭山人，东北大学教授，博士生导师.
基金资助:
河北省自然科学基金钢铁联合基金资助项目(E2014501114，E2018501016)；辽宁省自然科学基金资助项目(20170520314)；中央高校基本科研业务费专项资金资助项目(N172304042).

Constitutive Equations for Moderate-Temperature Deformation of Fe-6.5%Si Steel

MEI Rui-bin^1,2， BAO Li¹， LI Chang-sheng²， LIU Xiang-hua²

1. School of Resources and Materials， Northeastern University at Qinhuangdao， Qinhuangdao 066004， China; 2. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.

Received:2017-04-29 Revised:2017-04-29 Online:2019-01-15 Published:2019-01-28
Contact: MEI Rui-bin
About author:-
Supported by:
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摘要/Abstract

摘要： 利用Gleeble 3500开展了Fe-6.5%Si(质量分数)钢在变形温度300，400，500，600℃及应变速率为0.05，0.5，5s^-1条件下的单道次压缩实验.在初始均匀塑性变形阶段，加工硬化作用使流动应力迅速增加，随着变形继续动态软化机制启动，流动应力增加量减弱.随着温度升高和应变速率降低，应变硬化指数减小.提出了通过变形温度、应变速率描述应变硬化指数的方法构建Fe-6.5%Si钢中温变形过程本构方程.构建的本构方程对不同变形条件的应力预测结果和实测值吻合良好，平均相对误差约为5.35%，预测精度较高.

关键词: Fe-6.5%Si钢, 应变硬化指数, 流动应力, 中温变形, 本构方程

Abstract: Using Gleeble 3500， the deformation behaviors of a single-pass compression for Fe-6.5%Si steel at temperature ranging from 300 to 600℃ and strain rate ranging from 0.05 to 5s^-1 were studied. The flow stress increases dramatically at initial uniform plastic deformation stage due to work hardening， while the increment of flow stress is to be weakened during further deformation when the dynamic softening occurs. The strain hardening index decreases with increasing the temperature and decreasing the strain rate. A new constitutive model of Fe-6.5%Si steel at moderate-temperature deformation was proposed through describing the strain hardening index as the function of temperature and strain rate. The results predicted by this model are in good agreement with the experimental data， with an average relative error about 5.35%.

Key words: Fe-6.5%Si steel, strain hardening index, flow stress, moderate-temperature deformation, constitutive equation

中图分类号:

TG302

梅瑞斌，包立，李长生，刘相华. Fe-6.5%Si钢中温变形过程本构方程[J]. 东北大学学报:自然科学版, 2019, 40(1): 43-47.

MEI Rui-bin， BAO Li， LI Chang-sheng， LIU Xiang-hua. Constitutive Equations for Moderate-Temperature Deformation of Fe-6.5%Si Steel[J]. Journal of Northeastern University Natural Science, 2019, 40(1): 43-47.

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Fe-6.5%Si钢中温变形过程本构方程

Constitutive Equations for Moderate-Temperature Deformation of Fe-6.5%Si Steel

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