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 bendi,lg 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 rnartensitic UHSS, which character- ized by minimum relative bending radius （Rmin/t） under different bending angles, was experimentally obtained amt analyzed with the re- lated factors. The results show that for the martensitic steel with the st,＇ength less than 1180 MPa and the bending angle snmller than 120°,. Rmin/t 〈 1. And for 1300MS and 1400MS, R,,,i,,/t≥2. 5, and the bending property shows no sensitivity to the bending angle bigger than 90°. The minimu,n relative bending radius of marlensitic UHSS is attbeted greatly by the anisotropy. The bending property of the rnlling direction （L） is better than that transverse to rolling direttion （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 bendi,ag radius during forming, which shows the worse berating property without obvious linear relationship.
出处
《锻压技术》
CAS
CSCD
北大核心
2014年第5期116-120,共5页
Forging & Stamping Technology
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
martensitie ultra-high strength steel
bending property
three point bending tests
minimum relative bending radius
