H型钢变形量与奥氏体组织演变研究

Research on deformation and austenitic structure evolution for H-beam steel

借助有限元模拟方法,对H型钢生产过程中粗轧、精轧单道次和多道次变形压下量、轧制速率对奥氏体组织演变的影响进行研究,并表征了奥氏体再结晶和晶粒直径大小的关系。模拟结果表明:轧制前几个道次较大应变有利于奥氏体晶粒细化,高温段大变形量对细化奥氏体晶粒、均匀奥氏体组织有利。利用组合优化后的模拟结果,改进轧制工艺,现场应用结果表明,优化后奥氏体晶粒的最大值减小了近30%,奥氏体组织更加均匀,平均晶粒尺寸相应减小,奥氏体组织得到细化,有利于提高H型钢的力学性能。

The influences of rolling deformation and rolling rate in the single pass and multi passes of rough rolling and finish rolling during production of H-beam on austenitic structure evolution were researched by the method of FEM. And the relationship between austenitic recrystallization and grain diameter size was characterized. The simulation results showed that the larger strain in the early few passes of rolling was beneficial to austenite grain refinement,and the large deformation at high temperature was beneficial to refining austenite grain and homogenizing austenitic structure. The rolling process was improved after using the combination optimization simulation results,and was practiced in the field. It was showed that the size maximum of the optimized austenite grain was reduced by almost 30 %,austenitic structure was more even,the average grain size reduced accordingly,and austenitic structure refined,all of which could improve the mechanical properties of h-beam.