FRECKLE FORMATION AND CHARACTERIZATION OF A Ni-Cr-Mo-Fe-W ALLOY
The freckle formation and their phase characterization in freckle areas were investigated by means of microstructure analysis approaches and a thermodynamic equilibrium phase calculation method in a Ni-Cr-Mo-Fe-W alloy. These results show that in freckle areas a large number of M6 C, μ and P phases precipitate in grain boundaries even within grain due to the enrichment and segregation of Mo and C during solidification, which results in small grains in freckle areas. Equilibrium phase and liquid segregation calculation can give an reasonable interpretation of the freckle feature for this alloy.
作 者： J.X.Dong M.C.Zhang Y.P.Zeng X.S.Xie 作者单位： University of Science and Technology Beijing, Beijing 100083, China 刊 名： 金属学报(英文版) ISTIC EI 英文刊名： ACTA METALLURGICA SINICA(ENGLISH LETTERS) 年，卷(期)： 2004 17(4) 分类号： 关键词： freckle Ni-Cr-Mo-Fe-W alloy thermodynamic calculation