Process of Graphite Precipitation in Calcium Graphite Steel

概要

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The effect of calcium on the graphite precipitation from the γ phase of a hypereutectoid steel has been examined with an apparatus newly designed for the measurement of solidifying contraction. It was ascertained that the graphite precipitation in the solidifying process occurred over the range from the vicinity of the saturation curve E'S' of the γ phase (Agr point) to the A_1 point, and that the graphitization took place most remarkably near the A_1 point. The addition of a large amount of metallic calcium or of Fe-Ca-Si alloy greatly affected the solidifying contraction curve, leading to a considerable expansion due to ferrite formation near the A_1 point. In this case the rise of the A_1 point was not observed, although Si content increased. The addition of Fe-Ca-Si alloy as the graphitizing agent increased the amount of residual calcium more than that in the case of the addition of metallic calcium.
東北大学の論文