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研究了亚共晶、过共晶铸铁合金液在不同热状态下的凝固组织，以及组织对力学性能的影响等。发现，炉料对铸件产生明显的组织遗传效应；随合金液过热温度的升高，铸件中石墨相的数量减少且变细、碳化物增多、组织趋于均匀、合金的硬度提高、冲击韧性下降；随合金液保温时间延长，组织遗传性衰退、石墨相球化、碳化物变细。设计的热速处理新工艺能显著提高合金的力学性能。根据遗传观点，分析了试验结果及其意义，探讨了热速处理的作用机理。
The microstructure of hypoeutectic and hypereutectic cast iron alloy under different thermal states was studied, and the effect of microstructure on the mechanical properties was also studied. It was found that the charge had obvious tissue genetic effect on the castings. With the increase of overheating temperature, the number of graphite phases in the castings decreased and became finer, carbides increased, the microstructure became more uniform, the hardness of the alloy increased, and the impact toughness decreased. With the alloy liquid incubation time, tissue genetic decline, graphite phase of the ball, carbide thinner. The new design of heat treatment process can significantly improve the mechanical properties of the alloy. According to the genetic point of view, the experimental results and their significance are analyzed, and the mechanism of heat treatment is discussed.