研究了Fe-Cr-Mo、Fe-Cr-W合金的时效析出过程,发现在时效初期、两合金系中均有过渡R相析出,过渡R相为菱形点阵,α=0.9075nm,α=74.45°,其成分在Fe-Cr-Mo合金中为Pe-(27.5—34.9)Mo-(0—25.5)Cr,在Fe-Cr-W合金中为Fe-(28.9—33.0)W-(9.36—21.0)Cr(at.-％),时效后期,过渡R相分别向平衡相μ相、Laves相、χ相及σ相转变。
The precipitation behaviour of Fe-Cr-Mo and Fe-Cr-W alloys duringaging has been experimentally studied. It was found that in the early stage of ag-ing, a metastable R phase precipitated in both Fe-Cr-Mo and Fe-Cr-W alloys,which transformed to stable μ-phase, Laves-phase, X-phase or σ-phase in the laterstage. The crystallographic structure of metastable R phase is rhombohedral withlattice parameters α=0.9075nm, α=74.45°. The chemical composition of metastableR phase is Fe-(27.5--34.9)Mo-(0--25.5)Cr and Fe--(28.9--33.0)W--(9.36--21.0) Crin at.-% in Fe-Cr-Mo and Fe-Cr-W system, respectively.
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