Influence of Alloying Elements on Graphite Morphology and Cooling Curves in Ni-C Alloys

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  • Ni-C合金の黒鉛形態と冷却曲線に及ぼす添加元素の影響
  • Ni C ゴウキン ノ コクエン ケイタイ ト レイキャク キョクセン ニ オヨボス テンカ ゲンソ ノ エイキョウ

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Abstract

The influence of alloying elements on graphite morphology and cooling curves was studied using Ni-C eutectic alloys. Ninety grams of Ni-C parent alloys, prepared using high purity metals, was melted in an Ar atmosphere at 1500°C and cooled at the rate of 40K/min. Their cooing curves were monitored every 0.1s using a B-type thermocouple located at the center of the samples. The graphite morphologies of the samples were observed using an SEM and optical microscope. <br>  Experimental results showed that spheroidal graphite formed after the crystallization of chunky graphite. This phenomenon completely differed from that of the Fe-C alloys, in which after the spheroidal formation the chunky graphite crystallizes. These results were confirmed by the cooling curves and microstructure.

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