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使用“团簇加连接原子”结构模型研究了低活化铁素体/马氏体钢的成分特征,确定了BCCFe-Cr二元基础团簇式[CrFe14](Cr0.5Fe0.5),其中团簇[Cr-Fe14]是以溶质原子Cr为心周围被14个基体Fe包围的菱形十二面体。根据团簇式自洽放大和相似组元替代原则,添加V、Mn、Mo、W、Nb和C等合金元素得到2个系列团簇成分式,无C系列[Cr16Fe224](Cr8(V,Nb,Mn,Mo,W,Fe)8)和含C系列{[Cr16Fe224](Cr8(V,Nb,Mn,Mo,W,Fe)8)}C1。使用铜模吸铸快冷技术制备直径6 mm的合金棒,将其在1323 K保温0.5 h+水冷,随后在1023 K保温1 h+水冷。结果表明,无C系列置换固溶体合金为单一铁素体组织,含C系列合金的微观组织随着合金化组元种类和含量的不同而变化;合金的硬度随着组织的改变而改变,且置换固溶体系列合金的硬度随着合金体电子浓度VEC/Ra3的增加而单调降低。
The compositional characteristics of low activation ferrite / martensitic steel were studied by using the “cluster plus connected atom” structural model, and the binary basic cluster [CrFe14] (Cr0.5Fe0.5), BCCFe- Among them, cluster [Cr-Fe14] is a rhombic dodecahedron surrounded by 14 matrix Fe surrounded by solute atoms Cr. Based on the self-consistent scaling of clusters and the substitution of similar elements, two series of cluster compositions were obtained by adding V, Mn, Mo, W, Nb and C alloying elements without C [Cr16Fe224] (Cr8 (V, Nb , Mn, Mo, W, Fe) 8) and C series {[Cr16Fe224] (Cr8 (V, Nb, Mn, Mo, W, Fe) 8)} C1. The alloy rod with the diameter of 6 mm was prepared by copper mold suction rapid cooling technology, which was kept at 1323 K for 0.5 h + water cooling and then cooled at 1023 K for 1 h + water cooling. The results show that the microstructure of the alloy without C series substitutional solid solution is single ferrite. The microstructure of the alloy containing C varies with the type and content of alloying elements. The hardness of the alloy changes with the change of microstructure, The hardness of the solid solution series alloy monotonically decreases with the increase of the alloy electron density VEC / Ra3.