Transactions of Materials and Heat Treatment

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

Authors： Cui Huali Wu Yuanyuan

Unit： Institute of Intelligent Manufacturing Zhengzhou University of Economics and Business

KeyWords： dual-phase steel fracture failure ultimate cold bending stress triaxiality martensitic structure

ClassificationCode：TG142.1；U467.1+4

year,vol(issue):pagenumber：2025,50(7):271-280

Abstract：

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.

Funds：

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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