汽车大梁钢510L冲压开裂原因分析  

Analysis of Cracking of Automobile Beam Steel 510L During Stamping

作　　者：方圆[1] 阳代军[1] 张宏艳[1] 艾矫健[2] 

机构地区：[1]首钢技术研究院,北京100043 [2]首钢京唐钢铁联合有限责任公司,唐山063200

出　　处：《热加工工艺》2012年第3期169-170,172,共3页Hot Working Technology

摘　　要：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。Reasons of cracking during stamping of 510L were analyzed by ICP,OM and SEM.The results show that content of P and S is lower and the microstructure of steel is ferrite ＋ pearlite.There is large B-type inclusions and some block inclusions with size 5～8 μm,which is mainly composed of Nb in the steel.And micro-crack appeares around the block inclusions because of outside force.So the large B-type inclusions and the block inclusions which is mainly composed of Nb in the steel are the primary reason of cracking.

关 键 词：汽车大梁钢 510L 冲压 开裂 

分 类 号：TG142.33[一般工业技术—材料科学与工程]