STRUCTURE FORMATION OF UNDERCOOLED Fe-30Ni ALLOY

Abstract

Abstract: Bulk Fe-30Ni alloy melt was nudercooled up to 337K by combining the glass fluxing technique with superheating-cooling cycle. Grain refinement at low undercoolings was observed in the experiment in addition to that at high undercoolings. The current grain refinement mechanisms were examined, and it is concluded that the refined gains are all developed from dendrites, however the grain refinement at low undercoolings is due to chemical superheating, while that at high undercoolings due to rapid solidification contruction.

Key words: Fe-Ni alloy, undercooling, solidification structure

J.F. Li, J.G. Li, X.P. Zhang and Y.H. Zhou (School of Materials Science and Engineering, Shanghai Jiao Tong University , Shanghai 200030, China). STRUCTURE FORMATION OF UNDERCOOLED Fe-30Ni ALLOY[J]. Acta Metallurgica Sinica (English Letters), 2000, 13(5): 1029-1033.

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STRUCTURE FORMATION OF UNDERCOOLED Fe-30Ni ALLOY

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