Transactions of Materials and Heat Treatment

Title：Influence of strain rate on mechanical properties and fracture morphology for H260YD+Z steel

Authors： Wang Yanting1 Zhang Longlie2 Hei Zhonglei1

Unit： 1.College of Automotive Engineering Huanghe Jiaotong University Jiaozuo 454950 China 2.Do-Fluoride New Materials Co. Ltd. Jiaozuo 454950 China

KeyWords： strain rate mechanical properties ductile fracture fracture morphology perforation

ClassificationCode：TG142.1+2；U463.83

year,vol(issue):pagenumber：2025,50(6):249-258

Abstract：

For H260YD+Z interstitial free steel, the influences of strain rate on mechanical properties and fracture morphology were analyzed. Firstly, the high-speed tensile mechanical property curves of H260YD+Z steel at seven strain rates were obtained, and the variation rules of key parameters were analyzed. Then, based on the Johnson-Cook model, the dynamic mechanical property constitutive model of the material was established, and the accuracy of the constructed constitutive model was verified by the comparison analysis between the perforation test and the simulation. Finally, the fracture morphology of tensile specimens under different strain rates was analyzed, and the distribution laws of dimples and cracks were obtained. The results show that HC260YD+Z steel exhibits obvious strain rate sensitivity, the strength is positively correlated with the strain rate, and the change trend of plastic characteristics is relatively complex. The tensile fractures under different strain rates are all dimple-shaped, which are ductile fracture characteristics, and the size and density of the dimples increase with the increasing of strain rate. The fracture crack first initiates at the grain boundary of ferrite, and the closer to the fracture, the greater the crack density. The determination coefficient of the fitting curve for the Johnson-Cook constitutive model exceeds 0.97, and the deviation of the key parameters obtained by the perforation test and the simulation analysis is less than 5%, indicating that the constructed material constitutive model has high characterization accuracy.

Funds：

河南省教育科学规划2024年度一般课题（2024YB0398）

作者简介：王彦婷（1988-），女，硕士，讲师，E-mail：757219202@qq.com

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