40CrNiMo钢35t多边形铸锭凝固过程的数值模拟

Numerical Simulation of Solidification Process of 40CrNiMo Steel 35 t Polygonal Ingot

运用三维铸造软件Procast建立了40CrNiMo合金钢（/%：0.37-0.44C,0.17-0.34Si,0.50-0.80Mn,≤0.035P,≤0.035S,0.60-0.90Cr,1.25-1.65 Ni,0.15-0.25Mo）35 t多边形铸锭凝固过程的数学模型,模拟铸锭的浇注（1 313 s）、充型凝固（73 942 s）过程铸锭的温度场和钢的凝固收缩率。结果表明,模拟计算得出铸锭完全凝固时间20.5 h与现场测量的凝固时间22 h基本一致;钢的凝固收缩率≤2.5%,铸锭无二次缩孔,疏松轻微。

A mathematic model for solidification process of 35 t polygonal ingot of 40CrNiMo steel （/% ： 0. 37 - 0.44C,0.17-0.34Si,0.50-0.80Mn, ≤0.035P, ≤0.035S, 0. 60 - 0. 90Cr, 1.25 -1.65Ni, 0.15-0.25Mo） has been established by using three-dimensional software Procast to simulate the ingot temperature field and steel shrinkage rate during pouring （for 1 313 s） and mold-filling solidification （for 73 942 s） process. Results show that the simulation-calculated complete solidification time of ingot- 20. 5 h is basically the same as measured solidification time of ingot in situ- 22 h; the shrink rate of steel is ≤2. 5%, the cast ingot has no secondary pipe and only has light porosity.