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The precipitation behaviour of Fe-Cr-Mo and Fe-Cr-W alloys during aging has been ex-perimentally studied.It was found that in the early stage of aging,a metastable R phase pre-cipitated in both alloys,it was transformed into stable μ-phase,Laves-phase,X-phase orσ-phase in the later stages.The crystallographic structure of metastable R-phase isrhombohedral with lattice parameters of a=0.9075 nm and α=74.45°.The chemical compo-sition of R-phase is Fe-(27.5—34.9)Mo-(0—25.5)Cr and Fe-(28.9—33.0)W-(9.36—21.0)Cr in at.-% in Fe-Cr-Mo and Fe-Cr-W system,respectively.
The precipitation behavior of Fe-Cr-Mo and Fe-Cr-W alloys during aging has been ex-perimentally studied. It was found that in the early stage of aging, a metastable R phase pre-cipitated in both alloys, it was transformed phase of Laves-phase, X-phase or σ-phase in the later stages. The crystallographic structure of metastable R-phase is rhombohedral with lattice parameters of a = 0.9075 nm and α = 74.45 °. The chemical compo- sition of R-phase is Fe- (27.5-34.9) Mo- (0-25.5) Cr and Fe- (28.9-33.0) W- (9.36-21.0) Cr in at .-% in Fe-Cr-Mo and Fe-Cr -W system, respectively.