Transactions of Materials and Heat Treatment

Title：Experimental investigation on bending property of martensitic ultra high strength steel based on three-point bending test

Authors： Han Fei Xiao Hua Shi Lei Zhang Kun

Unit： Research Institute of Baoshan Iron & Steel Co. Ltd. State Key Laboratory of Development and Application Technology of Automotive Steel (BAOSTEEL)

KeyWords： martensitic ultra-high strength steel bending property three point bending tests minimum relative bending radius

ClassificationCode：TG386

year,vol(issue):pagenumber：2014,39(5):116-120

Abstract：

Based on three point bending experiment, the bending property of martensitic ultra high strength steel(UHSS) was studied. The arrangement of tests was designed according to the dichotomy principle. The bending property of martensitic UHSS, which characterized by minimum relative bending radius (Rmin/t) under different bending angles, was experimentally obtained and analyzed with the related factors. The results show that for the martensitic steel with the strength less than 1180 MPa and the bending angle smaller than 120°, Rmin/t＜1. And for 1300MS and 1400MS, Rmin/t≥2.5, and the bending property shows no sensitivity to the bending angle bigger than 90°. The minimum relative bending radius of martensitic UHSS is affected greatly by the anisotropy. The bending property of the rolling direction(L) is better than that transverse to rolling direction(T). Hence, the anisotropic index could not describe the difference of bending behavior between different directions. The higher tensile strength, and the higher minimum relative bending radius during forming, which shows the worse bending property without obvious linear relationship.

Funds：

韩非（1980-），男，博士，工程师

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