| For the purpose of investigating the effects of the Al content on the elevated temperature mechanical properties of Fe-Al-C alloys, high temperature tensile test and thermal fatigue test were performed using a series of alloys containing various amounts of Al ranging up to ∼4.5 wt%. Thermal conductivity was also measured. At low temperatures, the thermal conductivity of flake graphite cast iron was higher than that of C/V graphite east iron, but both cast irons exhibited a similar value of conductivity at high temperature near 300℃. The thermal conductivity was decreased with the increase in the Al content and the decreasing rate was reduced with the increase in the temperature. The tensile strength at 700℃ was increased with the increase in the Al content in bath cast irons, but the tensile strength was higher in the case of the C/V graphite cast iron as compared to the flake graphite cant iron. The thermal fatigue life of C/V graphite cast iron was, at temperatures from 300℃ to 700℃, superior to t at of flake graphite cast iron, particular1y in the case of low Al content. The thermal fatigue life of the C/V graphite cast iron deteriorated with increasing Al content, but that of the flake graphite cast iron improved with increasing Al content. |
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