Abstract: The three dimensional thermal mechanically coupled simulation on alloy steel 42CrMo4 roiling in box pass has been carried out by using LARSTRAN/SHAPE finite element software. The local variables including equivalent stress, equivalent strain, equivalent strain rate and temperature distribution etc during rolling are simulated incrementally by viscoplastic finite element method to calculate the dynamic recrystallization and grain size after each discrete time step. It is obtained by simulation that with initial rolling temperature ≥1 050°C , the percentage of dynamic? recrystallization for hot rolled steel 42CrMo4 increases. In steel 42CrMo4 production the available initial rolling temperature is 1 050 〜1 100 °C.

摘要： 应用LARSTRAN/SHAPE有限元模拟软件对42CrMo4合金钢箱形孔型轧制过程进行三维热力耦合有限元模拟。用粘塑性有限元理论模拟轧制过程各时间离散步的局部量包括等效应力、等效应变、等效应变速率、温度分布等,由此计算动态再结晶和晶粒大小的变化。通过模拟研究得出开轧温度≥1 050℃时,42CrMo4钢动态再结晶显著增加,生产42CrMo4钢棒材的合适开轧温度为1050～1100℃。

关键词: 42CrMo4钢, 热轧, 动态再结晶, 有限元模拟