材料期刊网

采用数值模拟的方法,结合宝钢2050热连轧层流冷却生产线,模拟研究了不同碳当量钢种在层流冷却条件下的奥氏体转变过程,计算了前段主冷、稀疏冷却、后段主冷3种冷却模式对奥氏体转变过程的影响,定量分析了带钢厚度方向不同部位处奥氏体转变的差别。结果表明：在所选定的工艺条件下,随着碳当量的增加,铁素体开始转变时间明显推迟,铁素体开始转变温度明显降低,而珠光体开始转变时间和温度变化不大;不同冷却模式下铁素体、珠光体各相开始转变时间及演变过程差别较大,但最终各相的体积分数接近一致;带钢厚度方向各部位由于冷却速度的不同而存在明显的组织不均匀性。

With the help of self-developed process modeling system, which was integrated into hot strip production line at Baosteel Co. , Ltd. , austenite transformation process was investigated for different carbon equivalent steels during run-out table cooling. The effect of different cooling patterns （early cooling, interrupted cooling, late cooling） on phase transformation was calculated, the phase transformation difference in the thickness direction was ana lyzed quantitatively. The results show that under the given processing condition, ferrite transformation start time is delayed with the increasing of carbon equivalent, hut pearlite transformation start time is less sensitive to the carbon equivalent, there is large difference among each phase transformation start time and evolution path under the different cooling patterns, while the final volume fraction of each phase is nearly identical, there exists clear microstruc ture heterogeneity in the thickness direction.