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利用MSC.Marc软件,对直径ф160mm GCr15轴承钢喷水冷却过程的温度场进行模拟分析。利用编写的ufilm和flux子程序,将相变潜热以内热源的方式添加到温度场。通过分析棒材在不同相变潜热取值下沿径向的温度变化情况,理论探讨了相变潜热对控冷工艺的影响。结果表明:相变潜热显著减缓了棒材的冷却速度,且越接近棒材芯部相变潜热引起的温升越大。考虑相变潜热时,原来的控冷方案不满足工艺要求。因此,在模拟研究控冷时,就本文理论探讨的GCr15轴承钢棒材的控冷工艺来看,相变潜热不应忽略。
Using MSC.Marc software, the temperature field of spray Ф160mm GCr15 bearing steel was simulated and analyzed. Utilize the ufilm and flux subroutines written to add phase change latent heat to the temperature field in a way that is an internal heat source. By analyzing the radial temperature changes of rods under different latent heat of transformation, the influence of latent heat of phase transformation on the controlled cooling process was theoretically discussed. The results show that the phase transformation latent heat remarkably slows down the cooling rate of the bar, and the closer the temperature rise caused by the latent heat of phase transformation in the bar core becomes. When considering the latent heat of phase change, the original control cooling solution does not meet the technical requirements. Therefore, in the simulation study of controlled cooling, the controlled cooling process of GCr15 bearing steel bar discussed in this paper should not be neglected.