Abstract: The numerical-simulation on blooming and rolling process with 5 passes of BD2 mill at 1 200 °C for heavy rail steel U75V (/% : 0. 70 〜0. 78C, 0.50 〜0. 70Si, 0. 75 ~1.05Mn, ≤0.025P, 0. 008 〜0. 025S, 0. 04 〜0. 08V) has been carried out by using nonlinear finite element software ANSYS/LS-DY, and the distribution of equivalent stress and equivalent strain at stable-section of rolling piece in each pass is analyzed. Results show that with change of each pass the distribution of stress and strain in head, waist and bottom of rolling piece is deferent ； it is obtained by analysis on rail head, waist and bottom at stable-section of rolling piece that the change of stress in head is largest, its maximum value is up to 64. 8 MPa, so increasing the yield strength of head of heavy rail is available to prolong the life of heavy rail.

摘要： 通过ANSYS/LS-DYNA非线性有限元软件对重轨钢U75V(/%:0.70～0.78C、0.50～0.70Si、0.75～1.05Mn、≤0.025P、0.008～0.025S、0.04～0.08V)在BD2轧机于1 200℃开坯5道次轧制过程进行了数值模拟,分析了各道次稳定断面处等效应力、等效应变的分布情况。结果表明,轧件头部、腰部和底部随每道次的变化其应力、应变分布存在差异;稳定截面处轨头、轨腰和轨底各道次应力曲线的分析得出,轨头应力变化最大,最大值达64.8 MPa,提高重轨轨头的屈服强度有利于延长重轨寿命。

关键词: 重轨钢, BD2, 有限元, 等效应力, 等效应变, 数值模拟