METASTABLE R PHASE IN Fe-Cr-Mo AND Fe-Cr-W ALLOYS

Acta Metall Sin

1990, Vol. 26

Issue (6): 24-28 DOI:

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METASTABLE R PHASE IN Fe-Cr-Mo AND Fe-Cr-W ALLOYS

LIU Shicheng;HAMAGOCHI Yoshikazu;KUWANO Hisashi Dalian Railway Institute Muroran Institute of Technology; Japan

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LIU Shicheng;HAMAGOCHI Yoshikazu;KUWANO Hisashi Dalian Railway Institute Muroran Institute of Technology; Japan. METASTABLE R PHASE IN Fe-Cr-Mo AND Fe-Cr-W ALLOYS. Acta Metall Sin, 1990, 26(6): 24-28.

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Abstract 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.

Key words: Fe-Cr-Mo alloy Fe-Cr-W alloy precipitation metastable R phase

Received: 18 June 1990

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