PHASE TRANSFORMATION AND CHARACTERISTICS IN FRECKLE AREAS FOR INCONEL 625 SUPERALLOY
来源期刊：Acta Metallurgica Sinica2005年第1期
论文作者：Y.P.Zeng X.S.Xie J.X.Dong M.C.Zhang
Key words：freckle; superalloy; Inconel 625; thermodynamic calculation;
Abstract: The freckle formation and their phase characterizatics in freckle areas were investigated by means of microstructure analysis approaches and a thermodynamic equilibrium phase calculation method in an Inconel 625 alloy.These results show that in freckle areas a large number of M6C, MC, Laves and δ phases precipitate in grain boundaries even within grain due to the enrichment and segregation of Mo and Nb during solidification, which results in almost of these freckle areas covered by these complex precipitated phases and induces small grains in freckle areas.Equilibrium phase and liquid segregation calculation can give a reasonable interpretation of the freckle feature for this alloy.
Y.P.Zeng1，X.S.Xie1，J.X.Dong1，M.C.Zhang1
(1.University of Science and Technology Beijing, Beijing 100083, China)
Abstract:The freckle formation and their phase characterizatics in freckle areas were investigated by means of microstructure analysis approaches and a thermodynamic equilibrium phase calculation method in an Inconel 625 alloy.These results show that in freckle areas a large number of M6C, MC, Laves and δ phases precipitate in grain boundaries even within grain due to the enrichment and segregation of Mo and Nb during solidification, which results in almost of these freckle areas covered by these complex precipitated phases and induces small grains in freckle areas.Equilibrium phase and liquid segregation calculation can give a reasonable interpretation of the freckle feature for this alloy.
Key words:freckle; superalloy; Inconel 625; thermodynamic calculation;
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