作　　者： (惠亚军）; (宁林新）; (潘辉）; (王智权）; (吴科敏）; (周娜）;

机构地区： 首钢集团有限公司技术研究院 绿色可循环钢铁流程北京市重点实验室

出　　处： 《首钢科技》 2017年第4期15-20,共6页

摘　　要： 采用OM和SEM等仪器与ABAQUS有限元仿真软件对600MPa级元宝梁用钢冲压开裂原因进行了分析。结果表明，600MPa级元宝梁用钢化学成分、力学性能和冷弯性能均满足标准要求，显微组织为准多边形铁素体与少量珠光体的混合组织，未见异常；开裂件断口形貌呈明显鱼骨状，钢板中心分层，两侧分布起源于中心分层并沿同一方向扩展的三角形台阶状断口，不同形貌断口均属于韧性断裂，而断口整体形貌显示材料在断裂前没有发生缩颈过程；利用ABAQUS软件对2种工况下的冲压工艺进行有限元分析，结果显示，先冲压再压边工艺边部应力集中更严重，边部节点应力超过了材料抗拉强度，从而导致撕裂现象的发生。优化冲压工艺后，元宝梁冲压开裂率由50％降至0，边部材料变形均匀，未见缩颈与开裂现象。 The causes of stamping cracking of 600 MPa grade crossbeam steel were analyzed by using OM, SEM and ABAQUS finite element simulation software. The results showed that the chemical composition, mechanical properties and cold bending properties of the steel could meet the standard requirements. The microstructure was composed of quasi-polygonal ferrite and a small amount of pearlite, and no abnormal microstructure was found. The fracture surface of the cracked pieces showed a fishbone-like morphology. The center of the plate was stratified, and the triangular step- like fracture distributed on both sides originated in the central cracks and extended along the same direction. The fractures of different morphologies were ductile fracture, and the fracture morphology showed no necking effect before the fracture. The finite element analyses of the stamping process under two kinds of working conditions were performed by using ABAQUS software. The results showed that the stress concentration of the edge of the first stamping and then flanging process was more serious, and the stress of the edge node exceeded the tensile strength of the material, which led to the tearing phenomenon. The stamping cracking rate of the crossbeam was reduced from 50 percent to 0 after optimizing the stamping process, and the edge deformation of the material was uniform and no necking and cracking occurred.

关 键 词： 级 元宝梁 冲压开裂 仿真分析