弹簧钢60Si2Mn大方坯凝固组织的数值模拟

Numerical Simulation on Solidification Structure of Cast Bloom of Spring Steel 60Si2Mn

运用ProCAST软件的CAFE模块对60Si2Mn弹簧钢325 mm×280 mm连铸坯的凝固组织进行模拟,研究了钢水过热度和二冷强度对铸坯凝固组织的影响。结果表明,浇钢过热度从10℃增大到30℃后,铸坯晶粒密度从1.055×10~6m^(-2)减小到1.520×10~5m^(-2),柱状晶显著发达;浇钢过热度同为20℃时,二冷区采用强冷后,晶粒密度从1.009×10~6m^(-2)增加到1.083×10~6m^(-2),等轴晶率增大5%。

Solidification structure of 325 mm × 280 mm cast bloom of spring steel 60Si2Mn has been simulated with CAFE module of ProCAST software to study the effect of liquid superheating extent and secondary cooling intensity on structure of solidification of cast bloom. Results showed that with increasing liquid superheating extent from 10 ℃ to 30 ℃, the density of grain in bloom decreased from 1. 055 × 10^6 m^-2 to 1. 520 × 10^5 m^-2 and the columnar crystal obviously developed ; as liquid superheating extent was 20 ℃ with intensive secondary cooling, the equiaxial crystal zone ratio increased by 5% and the grain density increased from 1. 009 × 10^6 m^-2 to 1. 083 × 10^6 m^-2 .