锻压技术

基于MMC模型的冷轧双相钢断裂失效性能分析

英文标题：Analysis on fracture failure performance of cold-rolled dual-phase steel based on MMC model

作者：崔华丽吴媛媛

分类号：TG142.1；U467.1+4

出版年,卷(期):页码：2025,50(7):271-280

摘要：

选取HC340/DP590D+Z、HC420/DP780D+Z、HC550/DP980D+Z这3种不同强度的双相高强钢开展断裂失效性能对比分析，研究了材料的化学成分、基体组织和力学特征，通过3种材料的极限冷弯性能试验和仿真对比，分析了强度对极限冷弯性能和强韧性的影响，并验证了所搭建断裂失效模型的可靠性。结果表明：3种材料马氏体组织的体积分数占比依次为3.69%、16.26%和36.12%；随着强度提升，各材料发生断裂失效时的极限塑性应变逐渐降低，极限冷弯角减小，材料的韧性降低，最大载荷提升，抵抗变形的能力增强；极限冷弯试验结果与仿真的载荷-位移曲线的贴合度较高，关键参数偏差未超过2.37%，表明所搭建的失效模型的预测精度较高。

For three different strengths of dual-phase high strength steels, HC340/DP590D+Z, HC420/DP780D+Z and HC550/DP980D+Z, the comparative analysis of fracture failure performance was conducted, and the chemical composition, matrix structure and mechanical characteristics of the materials were studied. Then, by the ultimate cold bending performance test and simulation comparison of the three materials, the influences of strength on the ultimate cold bending performance and the strength and toughness were analyzed, and the reliability for the fracture failure model was verified. The results show that the volume fractions of martensite structures for the three materials are 3.69%, 16.26% and 36.12%, respectively. With the increasing of strength, the ultimate plastic strain of each material when fracture failure occurs gradually decreases. The ultimate cold bending angle decreases, indicating that toughness of the material is reduced, while the maximum load increases, and the deformation resistance is improved.The load-displacement curves of the ultimate cold bending test and the simulation have a high degree of fit, and the deviation of the key parameters does not exceed 2.37%, indicating that the constructed failure model has a high prediction accuracy.

基金项目：

河南省科技攻关项目（242102220074）

作者简介：崔华丽（1980-），女，硕士，副教授 E-mail：cuihuali411@126.com

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