Q345钢凝固组织的模拟计算
赵莉萍1 李钊1 袁雪1 李建超2
（1.内蒙古科技大学 材料与冶金学院，内蒙古 包头 014010；2.内蒙古工业大学 材料与冶金学院，内蒙古 呼和浩特 010051）
摘 要：运用ProCAST软件对Q345钢凝固过程进行数值模拟。铸坯中心等轴晶率模拟结果与工业试验用钢检测结果相一致，同时应用CAFE机理研究了过热度对Q345钢铸坯凝固组织的影响及规律。结果表明，过热度对凝固组织结构影响较大，晶粒平均半径由75℃的0.231mm降低到15℃的0.191mm。因此，实际生产过程中，在保证钢液顺利浇注的情况下，综合考虑铸坯质量与生产顺利，过热度需控制在15℃左右为宜。
关键词：铸锭；凝固；组织；数值模拟；过热度
Simulation on the solidification microstructure of Q345 steel
ZHAO Li-ping1, LI Zhao1, YUAN XUE1, LI Jian-chao2
(1. Materials and Metallurgy School, Inner Mongolia University of Science and Technology , Baotou 014010, China; 2. Materials and Metallurgy School, Inner Mongolia University of Technology HU Hehaote 010051, China)
Abstract:Numerical simulation on solidification was carried out with a ProCAST software. The result of industrial testis consistent with that of the isometric grainof the simulation. The effect of the superheat degree on the frozen organization of Q345 was studied by using CAFE model of ProCAST.The result shows that the casting temperature greatly affects the solidification microstructure. When the superheat reduced form 75℃ to 15℃, the mean grain radius decreased from 0.231mm to 0.191mm. Therefore, the superheat temperature should be about 15℃ by comprehensive consideration of billet quality and smooth production while meeting the requirement of casting temperature for normal production.
Key words:ingot casting; solidification; organization; numerical simulation; degree of superheat