| 汽车B柱开裂原因分析 |
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| 引用本文： | 张晓丹,李继康,吴赵波.汽车B柱开裂原因分析[J].物理测试,2021,39(6):17. |
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| 作者姓名： | 张晓丹 李继康 吴赵波 |
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| 作者单位： | 钢铁研究总院，北京 100081 |
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| 摘 要： | 某热成型板汽车B柱在整车碰撞试验后发生开裂，对其进行断口分析、微观组织检验、力学性能研究，综合分析了其开裂原因。结果表明，该热成型板B柱由于焊接工艺问题，使用的CO2气体保护焊在焊缝不完全正火区，存在异常的贝氏体组织，且有带状组织存在，硬度远低于正常部位及技术要求，在碰撞后发生开裂。
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| 关 键 词： | 汽车B柱 热影响区 不完全正火区 带状组织 |
| 收稿时间： | 2021-10-11 |
Crack analysis of automotive B pillar |
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| ZHAGN Xiaodan,LI Jikang,WU Zhaobo.Crack analysis of automotive B pillar[J].Physics Examination and Testing,2021,39(6):17. |
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| Authors: | ZHAGN Xiaodan LI Jikang WU Zhaobo |
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| Affiliation: | Central Iron and Steel Research Institute, Beijing 100081, China |
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| Abstract: | An automotive B pillar made of thermoformed steel plates was cracked after the vehicle crash test. Fracture failure analysis of automotive B pillar was carried out by means of fracture analysis, microstructure examination and mechanical properties testing. The results show that the B pillar cracked at the incompletely normalized zone of GMAW welding joint. The metallographic structure is bainite and banded structure, whose hardness is much lower than normal position and technical requirements. |
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| Keywords: | automotive B pillar heat affected zone incompletely normalized zone banded structure |
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