Influence of Graphite on Linear Thermal Expansion Coefficient in Low Thermal Expansion Cast Iron

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  • 低熱膨張鋳鉄の平均線膨張係数に及ぼす黒鉛の影響
  • テイ ネツ ボウチョウ チュウテツ ノ ヘイキンセン ボウチョウ ケイスウ ニ

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  Low thermal expansion flake and spheroidal graphite cast irons were produced from high-purity pig iron, steel and electrolytic nickel. The average thermal expansion coefficient (α) in the temperature range from 323 K to 373 K for the cast irons with chemical composition of 35 % Ni-2 % C-1.2 % Si amounts to be 4 × 10-6∼4.5 × 10-6/K and the values of α are considered to be independent of the shape and size of graphite. However, an increase in volume fraction of graphite caused by carbon addition results in an increase in the value of α at 373 K, and results inversely in a decrease in the value of α at the temperatures higher than 473 K. The values of α in low expansion cast irons were found to be dependent on Ni concentration and volume fraction of primary austenite.

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