一方向凝固させたFe-C共晶合金の固液界面形状に及ぼすSの影響

Abstract

Groove depth of the non-faceted phase at the solid-liquid interface and spacing of the faceted phase were measured for vertically solidified austenite-graphite irregular eutectics to investigate the effect of the addition of interfacial active element sulphur.Groove depth, δ (mm), and inter-graphite spacing, λ (mm), were expressed as functions of solidification rate R(mm/s):(This article is not displayable. Please see full text pdf.) Groove depth was strongly influenced by the growth condition in the groove, for example, the temperature distribution in the groove, and was not so much influenced by the local growth condition at the eutectic tips which protrude into liquid; and it increased with a small addition of sulphur.Inter-graphite spacing decreased with decreasing sulphur, and approached the theoretical value derived by Jackson and Hunt if the eutectic tips were aligned on and the growth directions of the tips were perpendicular to the macroscopic solid-liquid interface plane; and it increased with a small addition of sulphur.