Fe-1.3C-5Cr-0.4Mo-0.4V超高碳钢的热变形行为与再结晶组织研究

doi:10.3901/JME.2020.12.116

机械工程学报 ›› 2020, Vol. 56 ›› Issue (12): 116-123.doi: 10.3901/JME.2020.12.116

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Fe-1.3C-5Cr-0.4Mo-0.4V超高碳钢的热变形行为与再结晶组织研究

张伟, 闫志杰, 王睿, 李大赵, 康燕, 武中豪, 杨晓敏

中北大学材料科学与工程学院太原 030051

收稿日期:2019-06-18 修回日期:2019-12-05 出版日期:2020-06-20 发布日期:2020-07-14
通讯作者: 闫志杰(通信作者),男,1974年出生,博士,教授,博士研究生导师。主要研究方向为凝固过程控制与新材料开发。E-mail:zjyan@nuc.edu.cn
作者简介:张伟,男,1994年出生。主要研究方向为超高碳钢热变形力学性能与微观组织。E-mail:zhangwei5435588@163.com
基金资助:
山西省自然科学基金（201801D121105）、中央引导地方科技发展专项资金（YDZX20191400004587）和山西省科技重大专项（20181101014）资助项目。

Hot Deformation Behavior and Recrystallization Structure of Fe-1.3C-5Cr-0.4Mo-0.4V Ultra High Carbon Steel

ZHANG Wei, YAN Zhijie, WANG Rui, LI Dazhao, KANG Yan, WU Zhonghao, YANG Xiaomin

School of Materials Science and Engineering, North University of China, Taiyuan 030051

Received:2019-06-18 Revised:2019-12-05 Online:2020-06-20 Published:2020-07-14

摘要/Abstract

摘要： 采用Gleeble-3500热模拟机对Fe-1.3C-5Cr-0.4Mo-0.4V超高碳钢在温度为950~1 150℃，变速率为0.01~5 s^-1，变形量为40%条件下进行热压缩模拟试验。研究Fe-1.3C-5Cr-0.4Mo-0.4V超高碳钢在热压缩过程中变形温度和应变速率对超高碳钢真应力-应变曲线，以及对再结晶组织演变的影响规律，并构建出超高碳钢本构方程。结果表明，在升高变形温度和降低应变速率的情况下，超高碳钢更容易发生再结晶。在应变速率一定时，流变应力随着温度的升高而降低；在温度一定时，流变应力随应变速率的减小而降低。通过流变应力曲线获得本构方程，能够准确地描述超高碳钢的流变行为，同时获得超高碳钢的激活能为Q=729.37 kJ/mol。在微观组织方面，变形温度为1 050℃时，应变速率由0.01 s^-1增加到5 s^-1时，晶粒尺寸降幅5.21 μm。因此，超高碳钢应该在温度为1 000~1 050℃和应变速率在1~5 s^-1下进行热变形。

关键词: Fe-1.3C-5Cr-0.4Mo-0.4V超高碳钢, 压缩变形, 流变应力, 流变应力本构方程, 微观组织演变

Abstract: The Gleeble-3500 thermal simulator is used to simulate the thermal compression of Fe-1.3C-5Cr-0.4Mo-0.4V ultra-high carbon steel under a temperature of 950-1 150, a strain rate of 0.01℃ -5 s^-1, and a deformation of 40%. To study the influence of deformation temperature and strain rate of Fe-1.3C-5Cr-0.4Mo-0.4V ultra-high carbon steel on the true stress-strain curve of ultra-high carbon steel during hot compression and the evolution of recrystallization structure, and construct stress constitutive equation of ultrahigh carbon steel. The results show that ultrahigh carbon steel is more prone to recrystallization when the deformation temperature is increased and the strain rate is lowered. When the strain rate is constant, the flow stress decreases with the increase of temperature, when the temperature is constant, the flow stress decreases with the decrease of strain rate. The constitutive equation is obtained by the flow stress curve, which can accurately describe the rheological behavior of ultra-high carbon steel, and the activation energy of ultrahigh carbon steel is Q=729.37 kJ/mol. In terms of microstructure, when the deformation temperature is 1 050, the grain size decreases by 5.21℃ μm when the strain rate from 0.01 s^-1 to 5 s^-1. Therefore, ultra-high carbon steel should be thermally deformed at a temperature of 1 000 to 1 050 and a strain rate of 1℃℃ to 5 s^-1.

Key words: Fe-1.3C-5Cr-0.4Mo-0.4V ultra-high carbon steel, hot compression deformation, flow stress, flow stress constitutive equation, microstructure evolution

中图分类号:

TG142

张伟, 闫志杰, 王睿, 李大赵, 康燕, 武中豪, 杨晓敏. Fe-1.3C-5Cr-0.4Mo-0.4V超高碳钢的热变形行为与再结晶组织研究[J]. 机械工程学报, 2020, 56(12): 116-123.

ZHANG Wei, YAN Zhijie, WANG Rui, LI Dazhao, KANG Yan, WU Zhonghao, YANG Xiaomin. Hot Deformation Behavior and Recrystallization Structure of Fe-1.3C-5Cr-0.4Mo-0.4V Ultra High Carbon Steel[J]. Journal of Mechanical Engineering, 2020, 56(12): 116-123.

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Fe-1.3C-5Cr-0.4Mo-0.4V超高碳钢的热变形行为与再结晶组织研究

Hot Deformation Behavior and Recrystallization Structure of Fe-1.3C-5Cr-0.4Mo-0.4V Ultra High Carbon Steel

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