Fe-Si-O 溶融合金の冷却凝固過程における SiO_2 介在物の生成

概要

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Fe-Si-O alloy melt kept at 1600℃ or 1645℃ in silica crucible for 20 min was cooled to 1555℃, and then heated again to the initial temperatures and kept for 20 min. Such cooling and heating cycle was repeated several times. Specimens were taken from the melt at 1600℃ and 1555℃ during each cooling period. Silica inclusions in the specimens generally consisted of three groups of different sizes ; the smaller particles of 0.5μ diam. delineated the cellular structure of the specimen, the medium ones of roughly 4μ appeared inside of the cell and the larger ones of 6∿20μ were randomly distributed. The number, size and form of particles of each size changed significantly with the silicon content of the melt, the sampler used and the repeated number of the cycle. It was concluded that the larger particles were formed during cooling of the melt and the medium and smaller ones precipitated during solidification of the specimen. The numbers of the larger sized particles in the specimens taken at 1600℃ and 1555℃ during each cooling period from 1645℃ agreed well with each other.
社団法人日本鉄鋼協会の論文
1982-09-01