基于40Cr高温动态力学性能的磨削表面动态再结晶行为

doi:10.12068/j.issn.1005-3026.2021.08.009

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (8): 1120-1126.DOI: 10.12068/j.issn.1005-3026.2021.08.009

基于40Cr高温动态力学性能的磨削表面动态再结晶行为

姚云龙，修世超，孙聪，洪远

(东北大学机械工程与自动化学院，辽宁沈阳110819)

修回日期:2020-12-01 接受日期:2020-12-01 发布日期:2021-09-02
通讯作者: 姚云龙
作者简介:姚云龙(1992-)，男，河南开封人，东北大学博士研究生；修世超(1959-)，男，辽宁凌源人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51775101)；中央高校基本科研业务费专项资金资助项目(N2024002-18，N180306003).

Dynamic Recrystallization Behavior of Grinding Surface Based on 40Cr High Temperature Dynamic Mechanical Properties

YAO Yun-long， XIU Shi-chao， SUN Cong， HONG Yuan

School of Mechanical Engineering & Automation， Northeastern University， Shenyang 110819， China.

Revised:2020-12-01 Accepted:2020-12-01 Published:2021-09-02
Contact: XIU Shi-chao
About author:-
Supported by:
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摘要/Abstract

摘要： 通过分离式霍普金森压杆(SHPB)实验得到了40Cr合金钢在高温高应变率下真应力-真应变曲线，据此确定了材料发生动态再结晶的临界条件.采用解析法和实验法分别求解了磨削强化层的温度场和塑性应变场分布.结果表明，磨削强化层在磨削深度方向具有较大的温度和塑性应变梯度;150μm强化层内会发生奥氏体转变;磨削表面最高温度可达1060℃.在磨削亚表面60μm内会产生剧烈的塑性变形，达到了再结晶的临界条件.较大的磨削深度使磨削强化层塑性应变增大，再结晶现象越充分，微观组织细化程度越高.

关键词: 分离式霍普金森压杆实验;磨削强化;微观组织;动态再结晶; 40Cr

Abstract: Through the split Hopkinson pressure bar experiment， the true stress-true strain curves of 40Cr alloy steel at high temperature and high strain rate are obtained. Then， the critical conditions for dynamic recrystallization of 40Cr are determined. An analytical method and experimental method are used to solve the temperature field and plastic strain field distribution of the grinding strengthening layer(GSL). The results show that the GSL has a large temperature and plastic strain gradient in the direction of grinding depth. The austenite transformation occurs within 150μm of the GSL. The maximum temperature of the ground surface can reach 1060℃. The severe plastic deformation can occur within 60μm of the ground subsurface， which reaches the critical condition of the dynamic recrystallization(DRX). With the larger grinding depth， the plastic strain of GSL increases， the DRX behavior is more sufficient， and the degree of microstructure refinement is higher.

Key words: split Hopkinson pressure bar experiment; grinding strengthening; microstructure; dynamic recrystallization; 40Cr

中图分类号:

TH164

姚云龙，修世超，孙聪，洪远. 基于40Cr高温动态力学性能的磨削表面动态再结晶行为[J]. 东北大学学报（自然科学版）, 2021, 42(8): 1120-1126.

YAO Yun-long， XIU Shi-chao， SUN Cong， HONG Yuan. Dynamic Recrystallization Behavior of Grinding Surface Based on 40Cr High Temperature Dynamic Mechanical Properties[J]. Journal of Northeastern University(Natural Science), 2021, 42(8): 1120-1126.

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基于40Cr高温动态力学性能的磨削表面动态再结晶行为

Dynamic Recrystallization Behavior of Grinding Surface Based on 40Cr High Temperature Dynamic Mechanical Properties

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