600 MPa级汽车大梁钢辊压开裂原因分析  

Cause Analysis of Roller Cracking of 600 MPa Grade Automobile Beam Steel

作　　者：白丽杨 文亮 戴思源 彭正波 陈勇 BAI Liyang;WEN Liang;DAI Siyuan;PENG Zhengbo;CHEN Yong(Maanshan Iron and Steel Co.,Ltd.,Maanshan,Anhui 243000,China)

机构地区：[1]马鞍山钢铁股份有限公司,安徽马鞍山243000

出　　处：《冶金动力》2024年第6期80-83,共4页Metallurgical Power

摘　　要：介绍了汽车大梁钢在分条辊压成型时,辊压折弯处出现表层开裂的原因,经金相显微镜、扫描电镜等检测分析,发现开裂件的裂口存在较多的D类氧化物及保护渣成分的外来夹杂物,夹杂物破坏了基体的连续性,在材料变形时造成应力集中,辊压折弯时夹杂物处基体产生裂纹源,随着变形量增加,裂纹扩展,造成钢板折弯表层开裂。This article describes the causes of surface cracking at the roll bending of automo⁃bile beam steel during slitting and roll forming.After metallurgical microscopy,scanning electron microscopy and other testing and analysis,it is found that there are more D-type oxides and protec⁃tion of slag composition of foreign inclusions exists in the cracked parts of the fracture,which dis⁃rupt the continuity of the substrate,leading to the concentration of stress during the deformation of the material.In roll forming process,inclusions in the matrix produces a source of cracks,with the increase in deformation crack expansion,resulting in steel plate forming surface cracking.

关 键 词：大梁钢 辊压成型 夹杂物 

分 类 号：TG335.1[金属学及工艺—金属压力加工]