基于数值模拟的贝氏体/马氏体耐磨铸钢件淬透性预测

Hardenability of Wear Resistant Bainitic Steel Casting by Numerical Simulation

基于数值模拟方法对贝氏体/马氏体钢板状铸件的淬透性进行了预测,同时探讨了取消B的合金化对淬透性的影响及提高淬透性的工艺。采用数值模拟计算了厚度为60 mm的贝氏体钢板状铸件的空冷温度场分布,获得了铸件不同位置的冷却曲线。根据预测结果,通过小试样控制冷却模拟了板状铸件心部空冷,获得空冷后的组织和性能,并预测了板状铸件的空冷淬透性。在此基础上对热处理工艺进行了优化,提高了铸件的空冷淬透性,探索了应用模拟方法进行大尺寸铸件研究的新途径。

The hardenability of bainite/martensite cast plate was predicted based on numerical simulation, and the influence of cancelling boron alloying on hardenability and the ways to improve were also discussed. The temperature field distribution of 60 mm thickness cast plate was calculated applying computer numerical simulation and the cooling curves at various sites were obtained. The microstructure and properties at the centre of cast plate were obtained by small sample control cooling, and its hardenability was predicted. Based on the predictions, the heat treatment process was optimized and the hardenability was improved. Therefore a new path on large cast research was provided through simulation methods.