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HEAT TRANSFER BEHAVIOR OF SUPERALLOY DROPLETS DURING SPRAY FORMING

J.F. Sun , J. Shen , Z. Y. Li , J. Jia and Q.C. Li National Key Laboratory of Metal Precision Hot Processing , Harbin Institute of Technology , Harbin 150001 , China

金属学报(英文版)

Based on the Newtonian heat transfer formulation and classical heterogeneous nucleation theory, a mathematical model has been established to predict the profile of flight velocity, heat transfer coefficient, temperature, solid fraction and cooling rate of atomizing droplets for a superalloy. The results indicated that above parameters change with different droplet size and flight distance. The changing trend as well as the mechanism for the change are described and discussed.

关键词: spray forming , null , null , null

CALCULATION OF BRAVAIS LATTICE AND LATTICE DISTORTION OF γ-TiA1 BASED ALLOY

X.Z. Ma , J. Shen , Y. Y. Chen , G. Wang and J. Jia School of Materials Science & Engineering , Harbin Institute of Technology , Harbin 150001 , China

金属学报(英文版)

Some ambiguous ackowledgements about unit cells of γ phase and α_2 phase of TiAl alloy are discussed in this paper correct unit cell parameters of γ and α_2 -phase are put forward. Meanwhile, lattice distortions of rapid-solidified TiAl2Cr2Nb alloy powders and thin films are determined by XRD method.

关键词: TiAl2Cr2Nb alloy , null

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