锻压技术

基于三点弯曲的马氏体超高强钢弯曲性能试验

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

作者：韩非肖华石磊张坤

单位：宝山钢铁股份有限公司研究院汽车用钢开发与应用技术国家重点实验室（宝钢）

关键词：马氏体超高强钢弯曲性能三点弯曲试验最小相对弯曲半径

分类号：TG386

出版年,卷(期):页码：2014,39(5):116-120

摘要：

基于三点弯曲试验，研究了马氏体超高强钢的弯曲性能。利用二分法原理安排了“基于凸模尺寸”的试验。得到了不同弯曲角度下、以最小相对弯曲半径为表征的弯曲成形性能，并分析了其影响因素。对于1180 MPa级别及以下马氏体钢，在120°弯曲角及以下，均有Rmin/t＜1。对于1300MS和1400MS，Rmin/t≥2.5；且大于90°弯曲角后，弯曲性能对弯曲角度不敏感。各向异性对马氏体超高强钢最小相对弯曲半径的影响显著，沿轧制方向（L）的弯曲性能优于垂直于轧制方向（T）；各向异性指数不能准确地表述马氏体超高强钢不同方向的弯曲变形行为和弯曲性能差异。随着强度的升高，断后伸长率接近线性下降，弯曲变形时相对弯曲半径值增大，弯曲性能下降，但并无很好的线性关系。

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.

基金项目：

韩非（1980-），男，博士，工程师

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