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本文着重研究钒和稀土对铸造CrMoV钢抗裂性能的影响,考察了钒和稀土对钢的凝固过程、枝晶偏析和碳化物形貌的影响。研究结果表明,当钢中合钒大于0．1%时,由于钒和铝具有强烈的枝晶偏析倾向,导致钢的组织和性能不均匀、枝晶间粗大碳化物形成,引起钢的塑性和韧性下降,导致裂纹产生。加入稀土,可以减小二次枝晶臂间距,减轻枝晶偏析和细化碳化物,从而提高钢的冲击韧性和裂纹扩展功,提高钢的抗裂性能。
This article focuses on the influence of vanadium and rare earth on the crack resistance of cast CrMoV steel and investigates the influence of vanadium and rare earth on the solidification process, dendritic segregation and carbide morphology of steel. The results show that when vanadium is more than 0.1%, vanadium and aluminum have a strong tendency of dendritic segregation, resulting in uneven microstructure and properties, coarse carbide formation between dendrites, plasticity of steel and Decreased toughness, resulting in cracks. Adding rare earth, can reduce the secondary dendrite arm spacing, reduce dendritic segregation and refinement of carbides, thereby enhancing the impact toughness and crack extension work of steel to improve the crack resistance of steel.