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

Hamagochi、Yoshikazu、Kuwano、Hisashi

1991Acta Scientiarum Naturalium Universitatis SunyatseniMaterials Science被引 3

摘要

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.

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