Transactions of Materials and Heat Treatment

Title：Study on the fracture performance of AHSS

Authors： Zhu Hongchuan Sun Yiqiang Wu Qingsong

Unit： Research and Development Center of Wuhan Iron and Steel Corp.

KeyWords： DP-steels forming process microstructure fracture performance

ClassificationCode：TG391.7

year,vol(issue):pagenumber：2015,40(12):115-119

Abstract：

In the forming process of ferrite-martensite DP-steel, it is a key problem that the edge cracking resulting in repair or failure. For an edge cracking in stamping an automobile part with DP780, the material mechanical property was compared with the standard tensile test and the cutting edge tensile test, and the crack morphology and the microstructure were also investigated. The experiment results show that the elongation of bad cut specimen is nearly 10% less than that of the good cut specimen, and the elongation of transverse cut specimen is 3% less than that of the longitudinal cut specimen caused by Mn segregation phase which making the martensite and MnS inclusion form a zonal distribution along the longitudinal direction. The crack in DP-steel evolves along the ferrite-martensite interface or through martensite, and the tiny martensite with cluster-type distribution increases crack sensitivity of DP-steel, while decreases its fracture performance.

Funds：

湖北省重大科技创新计划项目（2013AAB008）

作者简介:祝洪川（1975-），男，硕士，高级工程师

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