발간논문

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Vol.13, No.3, 352 ~ 354, 1975
Title
강수석 , 윤덕용
Abstract
The effect of cooling rate of sintering on the strength of sintered Fe-Cu has been studied. The copper conteet was varied between 0 and 12 weight %. The tensile test specimens were prepared by usual powder metallurgy techniques. The compacts were sintered at 1120℃ for 40 minutes in hydrogen atmosphere and cooled to room temperature at various cooling rates over several temperature ranges. The strength of specimens with more than 2% Cu increased greatly with increasing cooling rates between 850℃ and 600℃ the eutectoid transformation range. For 8% Cu, the ultimate tensile strengths for the fast cooled and slow cooled specimens were about 35 and 20 ㎏/㎟ respectively. This observation is explained by the decreasing size of the precipitated Cu-rich phase with fast cooling rate in the eutectoid transformation. For 2% Cu specimens, the strength increased with slow cooling rate below 600℃. This is attributed to the precipitation hardening effect of the Cu-rich phase. In general the strength of sintered Fe-Cu increased with copper content reaching the maximum strength for different Cu contents at various cooling rate. The effect of cooling rate on dimensional change was found to be negligible.
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