汽车大梁钢510L冲压开裂原因分析
Analysis of Cracking During Stamping of Automobile Beam Steel 510L
方圆，阳代军，张宏艳，艾矫健
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作者单位：首钢技术研究院
首钢京唐钢铁联合有限责任公司
中文关键字：汽车大梁钢；510L；冲压；开裂
英文关键字：automobile beam steel；510L；stamping；cracking
中文摘要：文章利用直读光谱、光学显微镜、扫描电镜对510L冲压开裂原因进行系统分析，结果表明，钢中P、S等杂质元素含量较低，显微组织为铁素体+珠光体组织，在钢基体中存在较大尺寸的B类夹杂物，同时心部珠光体带中存在一些尺寸为5~8μm富含Nb的块状物，且在这些富含Nb的块状物周围出现因受力发生开裂的微裂纹。因此冲压开裂的主要原因是由于夹杂物和富含Nb的块状物的存在破坏钢基体连续性所致。
英文摘要：Reasons of cracking During Stamping of 510L were analyzed by ICP, OM and SEM in this paper. The results showed that content of P and S was lower and the microstructure of steel was ferrite + pearlite. There were large B-type inclusions and some block inclusions with size 5~8μm, which was mainly composed of Nb in the steel. And micro-crack appeared around the block inclusions because of outside force. So the large B-type inclusions and the block inclusions which was mainly composed of Nb in the steel were the primary reason of cracking.