基于有限元高速线材预精轧与精轧过程的研究

Pre-rolling and rolling processes of high speed wire rod based on finite element

为揭示线材热轧过程中轧件内部微观组织的演化特征,对某厂Φ6.5 mm规格的ML08Al线材预精轧、预水冷和精轧过程进行了有限元模拟.预精轧开始轧件温度为980℃.温度与变形的模拟结果与实际生产情况基本吻合.结果表明:整个预精轧和精轧过程中,轧件心部温度一直很高,而轧件表面温度较低;轧件的变形主要集中于轧件心部和对角线方向,这些区域更有可能达到动态再结晶的条件使晶粒组织优先细化;其心部与表层所出现的混晶组织,是由变形条件和温度条件的综合作用而产生的;加大预水冷强度可以抑制晶粒长大,提高成品组织的均匀程度.

Finite element simulation is performed on the pre-rolling, pre-water cooling and rolling processes of the ML08Al wire rod with specification of Φ6.5mm. The pre-rolling temperature of the rolled piece begins at 980 ℃. The simulation results of the temperature and deformation are consistent with the actual production situation. The result shows that the center temperature of rolled pieces is very high and the surface temperature of rolled pieces is low during the whole pre-rolling and rolling processes. Deformation of the rolled pieces mainly occurs in the heart of rolled pieces and diagonal directions. These areas are more likely to achieve the condition of dynamic recrystallization and refine the grain. With the condition of deformation and temperature, the gap of core organization and surface organization can aggravate the mixed grain structure. Improving the pre-cooling intensity can inhibit the grain growth and increase the organization uniformity of the product.