. Transactions. Fig. 13.—Etched with picric acid and magnified 240 diameters. Shows Wid-mannstattian texture and swirls of ferrite., CHARLES Y. CLAYTON 443 -Etched with picric acid and magnified 240 diameters. Shows threeisolated swirls op perrite ix the center of a grain. 444 NEW OCCURRENCE OF PRO-EUTECTOID FERRITE A possible explanation of these swirls of ferrite is that the whirlingmotion of the molten steel in the runner causes the tips of the dendritesand dendrite branches to be rounded at different periods of crystalliza-tion, due to resolution. Upon these rounded points, low-carbo
. Transactions. Fig. 13.—Etched with picric acid and magnified 240 diameters. Shows Wid-mannstattian texture and swirls of ferrite., CHARLES Y. CLAYTON 443 -Etched with picric acid and magnified 240 diameters. Shows threeisolated swirls op perrite ix the center of a grain. 444 NEW OCCURRENCE OF PRO-EUTECTOID FERRITE A possible explanation of these swirls of ferrite is that the whirlingmotion of the molten steel in the runner causes the tips of the dendritesand dendrite branches to be rounded at different periods of crystalliza-tion, due to resolution. Upon these rounded points, low-carbon austenitewould be precipitated, due to selective freezing or the differential crystal-lization of Foley. Non-ferrous matter would, as a result, have a similararrangement due to its stratigraphic history. Upon passage throughthe transformation range, the arrangement of the pro-eutectoid elementwould be dependent on the previous distribution of the ferrous and non-ferrous elements. Two cast nickel-steel runners from different heatsexhibited this same peculiar occurrence of the pro-eutectoid element. Acknowledgment is due the Minneapolis Station of the U.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
