【摘要】 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。更多还原

【Abstract】 The effect of Rare Earth(RE) metamorphism on the cast steel 30 CrMnMo toughness is studied. RE Addition to increase the steel toughness (aku) at room temperature to minus 60℃ to mainly for refining the structure, improving submicrostructrue of martensites, raising residual austenites, increasing quantity of the tempered carbides and improving its distribution.更多还原