新型低碳含铌热轧H型钢的热变形行为

doi:10.13251/j.issn.0254-6051.2021.05.019

金属热处理 ›› 2021, Vol. 46 ›› Issue (5): 118-126.DOI: 10.13251/j.issn.0254-6051.2021.05.019

新型低碳含铌热轧H型钢的热变形行为

黎俊良¹, 邢军^1,2, 葛章琦¹, 李凡¹, 王永强¹, 李娜³, 吴保桥²

1.安徽工业大学材料科学与工程学院, 安徽马鞍山 243032;
2.马鞍山钢铁股份有限公司技术中心, 安徽马鞍山 243000;
3.安徽工业大学冶金工程学院, 安徽马鞍山 243032

收稿日期:2020-10-19 出版日期:2021-05-25 发布日期:2021-07-21
通讯作者: 王永强,副教授,博士,E-mail:yqwang@ahut.edu.cn
作者简介:黎俊良(1994—),男,硕士,主要研究方向为高性能钢铁材料,E-mail:ahut-jonnie@foxmail.com。
基金资助:
安徽高校自然科学研究项目(重点)(KJ2019A0070);安徽省高校优秀青年人才支持计划(gxyq2019023);马钢产学研项目(KFG-2019068)

Thermal deformation behavior of a low carbon hot-rolled H-beam steel containing niobium

Li Junliang¹, Xing Jun^1,2, Ge Zhangqi¹, Li Fan¹, Wang Yongqiang¹, Li Na³, Wu Baoqiao²

1. School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan Anhui 243032, China;
2. Technical Center, Ma'anshan Iron and Steel Co., Ltd, Ma'anshan Anhui 243000, China;
3. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan Anhui 243032, China

Received:2020-10-19 Online:2021-05-25 Published:2021-07-21

摘要/Abstract

摘要： 利用热压缩试验、显微组织分析等手段,研究了一种新型低碳含铌热轧H型钢在1000~1200 ℃变形温度和0.1~5 s^-1应变速率下的热变形行为。分析了变形参数对试验钢微观组织的影响,建立了耦合应变量因素的改进型本构方程,并采用临界比的临界应变模型对发生动态再结晶的临界应变值进行了预测。结果表明:较低应变速率和变形温度下,试验钢的原始奥氏体组织更均匀且平均晶粒尺寸更小;应变速率的升高不利于动态再结晶的发生。发生动态再结晶的临界应变与峰值应变的关系为ε_c/ε_p=0.47。与耦合应变量因素有关的本构方程和临界应变预测模型能较准确地预测各变形温度下低碳含铌热轧H型钢的流变应力和动态再结晶临界应变值。

关键词: 新型低碳含铌H型钢, 热变形行为, 动态再结晶临界应变, 本构方程

Abstract: Thermal deformation behavior at temperature between 1000-1200 ℃ with strain rate of 0.1-5 s^-1 of a new low-carbon hot-rolled H-beam steel containing niobium was studied by means of hot compression experiment and microstructure analysis. The microstructure of the tested steel affected by deformation parameters was analyzed. At the same time, an improved constitutive equation of coupled strain factor was established, and the critical strain model with critical ratio was adopted to predict the critical strain value for dynamic recrystallization. The results show that the original austenite structure is more uniform and the average grain is smaller at lower strain rate and deformation temperature. And the increase of strain rate is not conducive to the occurrence of dynamic recrystallization. The relationship between the critical strain for dynamic recrystallization and the peak strain is ε_c/ε_p=0.47. The constitutive equation related to the coupled strain factor and critical strain prediction model can accurately predict the flow stress and critical strain values of low-carbon niobium-containing hot-rolled H-beam steel at different deformation temperatures.

Key words: new low carbon H-beam steel containing niobium, thermal deformation behavior, dynamic recrystallization critical strain, constitutive equation

中图分类号:

TG141

黎俊良, 邢军, 葛章琦, 李凡, 王永强, 李娜, 吴保桥. 新型低碳含铌热轧H型钢的热变形行为[J]. 金属热处理, 2021, 46(5): 118-126.

Li Junliang, Xing Jun, Ge Zhangqi, Li Fan, Wang Yongqiang, Li Na, Wu Baoqiao. Thermal deformation behavior of a low carbon hot-rolled H-beam steel containing niobium[J]. Heat Treatment of Metals, 2021, 46(5): 118-126.

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新型低碳含铌热轧H型钢的热变形行为

Thermal deformation behavior of a low carbon hot-rolled H-beam steel containing niobium

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