利用“团簇加连接原子”结构模型研究了马氏体沉淀硬化不锈钢的成分特征,结果表明,此类钢的基础三元Fe-Ni-Cr高温奥氏体下限成分对应团簇成分式[NiFe12]Cr3,其中NiFe12为fcc结构,Ni为中心原子,其与12个Fe原子配位构成立方八面体团簇,Cr为连接原子.以[NiFe12]Cr3为基础成分式,根据团簇式自洽放大和相似组元替代原则,添加C,Mo,Nb和Cu形成多元新合金,采用铜模吸铸快冷技术制备合金,并在1323 K保温2h进行固溶处理后水淬,然后再在753 K保温4h进行时效处理.结果表明,固溶和时效后的系列合金的组织和性能随合金化组元的种类及含量发生变化,其中{ [(Ni13Cu3)Fe192] (Cr45Mo2.5Nb0.5)}C1合金在时效处理后具有较高的硬度和拉伸强度,其硬度为397 HV,屈服强度为971 MPa,抗拉强度为1093MPa,该成分合金在3.5%NaCl(质量分数)中性溶液中具有优良的耐蚀性能.
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