발간논문

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Vol.29, No.12, 1325 ~ 1331, 1991
Title
The Microstructures and mechanical Properties of the Extruded Bars of Rapidly Solidified Fe - 3.7wt% C - Cr Alloy Powders
김동익Dong Ik Kim, 나형용Hyung Yong Ra
Abstract
The purpose of this work was to develop an engineering materials having a high volume fraction of carbide. For this purpose, rapidly solidified Fe-3.7wt%C-(1∼4)wt%Cr alloy powder was made using high pressure gas atomizer and followed by hot extrusion. In this study, the microstructures and mechanical properties of extruded bars were discussed. The microstructures of extruded bars were found to be the mixture of carbide and fine pearlite. The average carbide particle size was about 2㎛ and the pearlite lamellar spacing was about 0.1㎛. The tensile strength increased with increasing extrusion ratio and reached 85∼90㎏/㎟ when extrusion rate was 13. Toughness was 4∼5㎏/㎟ when extrusion race was 13. Toughness was 4∼5㎏ m/㎠ and hardness was 55∼60 HRc.
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