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金属学报(英文版) 1999
GRAIN REFINEMENT INDUCED BY REMELTING IN UNDERCOOLED Fe-30at.%Co ALLOYS
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Abstract:
1.IntroductionSolidificationofundercooledmeltscanproducetherefinedmicrostructuresincludingdendritesandequiaxedgrainsthatareexpectedtoresultintheimprovementofmechanicalproperties.Itisgenerallybelievedthatthegrainrefinementoccurswhentheunderco0l-ingislargerthanthecriticalunderc0olinginsomealloys.Severalmechanismshavebeensuggestedtoaccountf0rtherefinement.Walkerdemonstratedthattheoccurrenceofgrainrefinementinundercooledmeltsisduet0thepressurepulsewhichhasbeende-tectedbytheemissi0nofasound.avel1].…
