FRECKLE FORMATION AND CHARACTERIZATION OF A Ni-Cr-Mo-Fe-W ALLOY  

作　　者：J.X.Dong M.C.Zhang Y.P.Zeng X.S.Xie 

机构地区：[1]University of Science and Technology Beijing, Beijing 100083, China,University of Science and Technology Beijing, Beijing 100083, China,University of Science and Technology Beijing, Beijing 100083, China,University of Science and Technology Beijing, Beijing 100083, China

出　　处：《Acta Metallurgica Sinica(English Letters)》2004年第4期414-418,共5页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.50371006);the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE,China

摘　　要：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 M6C, 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.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 M6C, 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.

关 键 词：FRECKLE Ni-Cr-Mo-Fe- W alloy thermodynamic calculation 

分 类 号：TG115[金属学及工艺—物理冶金]