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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 1994, Vol. 15 ›› Issue (11): 1357-1361.
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Liu Lin
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Abstract: Grain structures of nickel-base superalloy IN 738LC are invesitated under various casting conditions. It is found that grain size of y matrix and dimension of MC carbides reduce obviously by lowering the temperature of melt homogeneous treatment.The mechanism of grain refinement can be the existence of a number of unmeIted MC particles that serve as the substrata of nonspontaneous nucleation of y matrix during freezing.By comparing meIt pouring tempera-ture,mold preheating temperature with melt homogeneous treatment temperature,it can be con cluded that the last one plays a more predominant role on the grain structures than the first two。Therefore,one of the effective methods of refining grain structures is via controlling the melt homogeneous temperature.
Key words: heat resistant alloys, grain size, carbides
CLC Number:
V261.31
TG132.32
TG21
Liu Lin. GRAIN STRUCTURECONTROL OF NICKEL-BASE SUPERALLOYSIN CASTINGPROCESSES: EFFECTOFFOUNDRY VARIABLES[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 1994, 15(11): 1357-1361.
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