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Th e morphology of illelusiolls ill Fe alld Fc-Ni alloys. which were deoxidized with O. Iwl % of Si alld solidified ullidirectiollf/lly ullder sllecijied conditiolls, have been investigated. D elldritic illelusiolls were frequently observed ill ingots cOlltaillillg a large amount of O. but hardlj' in illgots whose 0 cOlltellt was smaller than the alllount equilibrating to the amount of Si at the liquidus te mpemture. Th e delldritic illelusiolls were classijied roughly illto two (ypes ,' one is those existillg main!), ill the illtercellular or illterdelldritic regioll of lIlatrix. alld the other is those growlI from a spherical /lrimary illelusioll. B) , electroll IJrobe microallalyses alld selected-area transmission electron diffraction eX/leriments Oil the dendritic inclusions. it was cOllfirmed that they were com/losed of silica or s ilicate and substalltially amorphous. The dendritic illclusiolls seemed to be formed b), a suitable gradiellt if a slifficient degree q(supersaturatioll , which was caused lIIailllj' b), th e segregatioll of 0 alld/or caused by supercoolillg durillg solidification of Fe.

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