大断面轴承钢控轧控冷工艺的模拟与分析

利用Gleeble 1500热模拟实验机,研究了轴承钢在850℃终轧后,不同冷却速度对其显微组织结构的影响规律.采用ANSYS有限元软件,模拟了大断面轴承钢在不同工艺制度下的温度场分布.结果表明:冷却速度是影响轴承钢碳化物析出的主要因素,在850℃终轧变形后,为了抑制网状的析出,冷却速度应达到3℃/s左右为宜;轴承钢断面越大,在快速冷却过程中,表面与心部的温度差越大(最大温差约450℃),心部冷却越困难;直径为60 mm以下圆钢,通过冷却强度与冷却制度的合理匹配,可以控制心部的冷速达到3℃/s,从而抑制网状碳化物析出.

Simulation and Analysis of Large Cross-Section Bearing Steel's TMCP Process

By using the Gleeble 1500 thermal simulator, the effects of various cooling rates on the microstructure of bearing steel after rolling at 850°C as finishing temperature has been investigated. Combined with large cross-section bearing steel rolling, the ANSYS finite element software was used to model the temperature field at varies cooling rates. It was found that the cooling rate plays an important role in carbide precipitation and the cooling rate after rolling is preferable to be about 3 °C/s to suppress the reticulated carbide precipitation. It also showed that for the large cross-section bearing steel, the bigger the temperature difference between the core and surface of the bar (up to about 450°C), the more difficult the cooling process of core. However, it's possible to control the cooling rate up to 3°C/s so as to suppress efficiently the reticulated carbide precipitation for the round bars (<60 mm) by way of matching properly the cooling intensity and cooling rate.