高强汽车大梁钢纵梁翼面开裂原因分析

为分析热轧高强汽车大梁钢纵梁成型过程中翼面开裂的原因,通过宏观观察,采用扫描电镜、金相、低倍检验等方法进行检测,并对开裂处的裂纹进行分析.结果 表明:纵梁翼面开裂的主要原因是翼面端部表面加工质量差,存在划伤和微裂纹,在连续辊压成型过程中翼面端部受到附加拉应力,在两者的共同作用下产生裂纹扩展从而引起纵梁翼面开裂.针对此种...

Cracking analysis of longitudinal beam wing surface of high strength automobile beam steel

In order to analyze the causes of wing surface cracking in the forming process of the longitudinal beam of hot rolled high strength automobile beam steel, the cracks at the cracking position were analyzed by means of macroscopic observation, scanning electron microscopy (SEM), metallographic analysis and macroscopic examination. The results showed that the main reason for the cracking of longitudinal beam wing surface was the poor surface machining quality at the end of the wing surface. There were scratches and microcracks. When the end of the wing surface was subjected to additional tensile stress in the process of continuous roller forming, the crack propagation was generated, which led to the cracking of the longitudinal beam wing surface. In view of such cracking, it was suggested to take measures to improve the processing and shearing quality of hot rolled sheet, so as to avoid the cracking caused by shearing quality effectively.