中锰汽车钢焊接热影响区组织与韧性

doi:10.3901/JME.2022.24.084

机械工程学报 ›› 2022, Vol. 58 ›› Issue (24): 84-93.doi: 10.3901/JME.2022.24.084

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中锰汽车钢焊接热影响区组织与韧性

王艳杰^1,2, 赵琳¹, 彭云¹, 曹洋¹

1. 钢铁研究总院焊接研究所北京 100081;
2. 北华航天工业学院材料工程学院廊坊 065000

收稿日期:2022-03-06 修回日期:2022-09-15 出版日期:2022-12-20 发布日期:2023-04-03
通讯作者: 赵琳(通信作者),男,1977年出生,博士,教授级高级工程师,博士研究生导师。主要研究方向为材料焊接、激光加工和增材制造技术。E-mail:hhnds@aliyun.com
作者简介:王艳杰,女,1981年出生,博士研究生,副教授。主要研究方向为高强钢焊接性及焊接材料。E-mail:26615049@qq.com;赵琳(通信作者),男,1977年出生,博士,教授级高级工程师,博士研究生导师。主要研究方向为材料焊接、激光加工和增材制造技术。E-mail:hhnds@aliyun.com
基金资助:
国家重点研发计划（2018YFB1107900）和国家科技部国际合作专项（2015DFA51460）资助项目。

Microstructure and Toughness of Welding Heat Affected Zone of Medium Manganese Automobile Steel

WANG Yanjie^1,2, ZHAO Lin¹, PENG Yun¹, CAO Yang¹

1. Welding Institute, Central Iron and Steel Research Institute, Beijing 100081;
2. College of Materials Engineering, North China Institute of Aerospace Engineering, Langfang 065000

Received:2022-03-06 Revised:2022-09-15 Online:2022-12-20 Published:2023-04-03

摘要/Abstract

摘要： 热模拟第三代中锰汽车钢热影响粗晶区的焊接热循环，并利用扫描电镜、透射电镜、显微硬度、冲击和电子背散射衍射（Electron back scatter diffraction，EBSD）试验方法研究了焊接热循环对粗晶区显微组织、硬度和冲击韧性的影响。结果表明：中锰钢热影响粗晶区经过焊接热循环后主要为马氏体组织，当冷却速度较快时，马氏体板条间分布着大量的位错团；随着冷速的减缓，组织中有少量的贝氏体生成，且组织逐渐粗化；粗晶区的硬度随着焊后冷速的减缓呈降低的趋势，在t_8/3>33s后硬度下降缓慢；粗晶区组织中有少量的M-A组元，对冲击韧性影响不大；中锰钢粗晶区中的大角度晶界（>15°）即原奥氏体晶界、马氏体板条束界和板条块界均对裂纹有阻碍作用；大角度晶界密度可作为衡量中锰钢粗晶区的韧性指标，其与冲击韧性成正比，均随着冷速的减缓先增加再逐渐降低，在冷却速度t_8/3为8s时，大角度晶界密度最大，获得的冲击韧性相对较好。

关键词: 中锰钢, 焊接热循环, 组织, 冲击韧性, 大角度晶界密度

Abstract: The coarse-grained heat-affected zone (CGHAZ) of the third generation medium manganese automobile steel was simulated by thermal simulation technique, and its microstructure, hardness and impact toughness were investigated using scanning electron microscope, transmission electron microscope, electron back scatter diffraction and Charpy impact test. The results indicate that the microstructure of the CGHAZ is mainly composed of martensite, and a large number of dislocation clusters are distributed in the martensite laths when the cooling rate is fast. As the cooling rate decreases, a small amount of bainite forms and the microstructure is gradually coarsened. The hardness of the CGHAZ decreases with an increase in t_8/3, and it decreases slowly as t_8/3 is over 33s. There is a small amount of M-A constituent in the CGHAZ, which has little effect on the impact toughness. The high-angle grain boundary (>15°) in the CGHAZ of medium manganese steel, namely the prior austenite crystal boundary, packet boundary and block boundary, may hinder the crack. The high-angle grain boundary density can be used as the indicator of the toughness of the CGHAZ, and it is proportional to the impact toughness, which increases first and then decreases gradually as the cooling rate decreases. At t_8/3 of 8s, the high-angle grain boundary density reaches the top value, resulting in sound impact toughness.

Key words: medium manganese steel, welding thermal cycle, microstructure, impact toughness, high-angle grain boundary density

中图分类号:

TG457

王艳杰, 赵琳, 彭云, 曹洋. 中锰汽车钢焊接热影响区组织与韧性[J]. 机械工程学报, 2022, 58(24): 84-93.

WANG Yanjie, ZHAO Lin, PENG Yun, CAO Yang. Microstructure and Toughness of Welding Heat Affected Zone of Medium Manganese Automobile Steel[J]. Journal of Mechanical Engineering, 2022, 58(24): 84-93.

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中锰汽车钢焊接热影响区组织与韧性

Microstructure and Toughness of Welding Heat Affected Zone of Medium Manganese Automobile Steel

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