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CO_(2)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。
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.
作者
张晓丹
李继康
吴赵波
ZHAGN Xiaodan;LI Jikang;WU Zhaobo(Central Iron and Steel Research Institute,Beijing 100081,China)
出处
《物理测试》
CAS
2021年第6期17-21,共5页
Physics Examination and Testing
关键词
汽车B柱
热影响区
不完全正火区
带状组织
automotive B-pillar
heat-affected zone
incompletely normalized zone
banded structure
