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研究了稀土变质对３０ＣｒＭｎＭｏ马氏体铸钢韧性的影响。添加稀土会使钢从室温到－６０℃时的韧性增加，其主要原因是细化了钢的组织，改善了马氏体亚结构，增加了残余奥氏体量及回火碳化物的数量并改善了其分布。
The effect of rare earth modification on the toughness of 30CrMnMo martensitic cast steel was studied. The addition of rare earth will increase the toughness of the steel from room temperature to -60 ℃. The main reason is to refine the microstructure of the steel, improve the martensite substructure, increase the amount of retained austenite and the amount of tempering carbides Improve its distribution.