球状黒鉛鋳鉄の溶湯の体積変化について

金 水泳, 近藤 忠史, 草川 隆次

doi:10.11279/imono.43.8_666

Shrinkage cavity is one of the greatest defects in spheroidal graphite cast iron. In order to find out the formation mechanism of the cavity, we must first quantitatively measure the volume change of molten spheroidal graphite cast iron. For this reason, the authors calculated in this experiment the volume change of this alloy by measuring its density at the molten state. Experiments have been made with hyper-eutectic composition, because this is the general kind of alloy, and calcium-silicide or Fe-Si-Mg alloy was added as spheroidal graphite reagent. The residual calcium content was 0.02 to 0.03% and the residual magnesium content was 0.06 to 0.08%. In general, the volume of molten alloy at temperature T_x is calculated by the following equation. [Written in non-displayable characters.] V_TX : calculated volume at T_x temperature. V_T0 : voume at eutectic temperature standard volume. Δ_V1 : volume change from eutectic temp. to liquidus line temp. Δ_V2 : volume change from liquidus line temp. to T_x. T_x : measured temperature. T₁ : liquidus line temperature. T₀ : eutectic temperature. In our experiments with the calcium-silicide reagent, the values of dV₁⁄(dV₁) and dV₂⁄(dV₂) were as follows. [Written in non-displayable characters.] The most important experimental results are summarized as follows. 1) Volume change of molten spheroidal graphite cast iron, to which calcium-silicide has been added as spheroidal graphite reagent, was 1.8%/100°C. 2) Volume change of molten flaky graphite cast iron-with the same composition as the former-was 1.5%/100°C.

球状黒鉛鋳鉄の溶湯の体積変化について

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球状黒鉛鋳鉄の溶湯の体積変化について

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収録刊行物

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