Periodic Macrostructure in Unidirectionally Solidified Ni-C Ingot

概要

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Carbon-saturated nickel melt containing sulphur up to 300 ppm was unidirectionally solidified at a rate of 0.3 to 0.5 mm/sec. When sulphur content was 100〜200 ppm, the ingots had a periodic macrostructure consisted of alternate layers with spheroidal graphite and with flaky graphite, which are parallel to solidification front. The thicknesses of layers with spheroidal graphite and those with flaky graphite were 2 to 10 mm, and 1 to 3 mm respectively. There were some features of the boundaries between two kinds of layers. Possibilities of the formation of the periodic structure were discussed.
東北大学の論文