【摘要】 为提高某厂42CrMoA钢内部质量，减少铸坯中心偏析，利用ProCAST软件对铸坯凝固组织进行模拟，研究连铸参数对凝固组织分布、等轴晶率和等轴晶区致密度的影响。结果表明，当拉速由0.8 m/min提高到1.1 m/min,等轴晶区比例增加了5.26%;比水量由0.144 L/kg增大到0.192 L/kg,等轴晶区比例减小了3.34%;过热度由5℃升高到35℃,等轴晶区比例减小了7.98%。由此得出，可以通过适当提高拉速、减小二冷比水量和降低钢水过热度来降低42CrMoA钢种宏观偏析。更多还原

【Abstract】 In order to improve the internal quality of 42CrMoA steel in a factory and reduce the casting of billet center segregation, the ProCAST software was used to simulate the casting of billet solidification structure, and the effect of continuous casting parameters on the distribution of solidification organization, the rate of equiaxial crystal and equiaxial crystalline area density was studied. When the casting speed was increased from 0.8 to 1.1 m/min, the proportion of equiaxial crystal zone has increased by 5.26%; When the cooling water flows increases from 0.144 to 0.192 L/kg, the proportion of equiaxial crystal zone has decreases by 3.34%; The superheat increases from 5 to 35 ℃, and the proportion of isometric crystal zone decreases by 7.98%. It is concluded that it is possible to reduce the macroscopic segregation of 42CrMoA steel by appropriately increasing the casting speed, decreasing the amount of water in the second cooling ratio and reducing the superheat of the steel.更多还原