Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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A Study on Microstructure and Mechanical Properties of TiC/Steel Composites Fabricated by Powder Metallurgy Process

분말야금공정으로 제조된 TiC/steel 금속복합재료의 미세조직 및 기계적 물성 연구

  • Lee, Jihye (Composites Research Division, Korea Institute of Materials Science) ;
  • Cho, Seungchan (Composites Research Division, Korea Institute of Materials Science) ;
  • Kwon, Hansang (Department of Advanced Material Engineering, Pukyong National University) ;
  • Lee, Sang-Kwan (Composites Research Division, Korea Institute of Materials Science) ;
  • Lee, Sang-Bok (Composites Research Division, Korea Institute of Materials Science) ;
  • Kim, Daeha (DAT Advanced Material) ;
  • Kim, Junghwan (Composites Research Division, Korea Institute of Materials Science)
  • Received : 2021.09.17
  • Accepted : 2021.10.28
  • Published : 2021.11.05
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Abstract

In this study, TiC/steel metal matrix composites were fabricated by powder metallurgy process using Fealloy powders with 3 wt.% Cr and 10 wt.% Cr, respectively, as matrix material. Subsequently, the composite samples were heat treated by the annealing and quenching-tempering(Q-T), respectively, to understand the effect of heat treatment on the mechanical properties of the composites. The correlation between microstructure and structural strength depending on the chromium content and the heat treatment conditions was studied through tensile, compressive, and transverse rupture test and microstructural analysis. In the case of TiC/steel composite containing 10 wt.% Cr, the tensile strength and transverse rupture strength at room temperature were significantly lowered by the influence of coarse chromium carbide formed at the TiC/steel interface. On the other hand, both TiC/steel composites containing 3 wt.% Cr and 10 wt.% Cr showed much higher compressive strength of about 4 GP after quenching-tempering compared to the annealed specimens regardless of the presence of the chromium carbide.

본 연구에서는 3 wt.%, 10 wt.% Cr이 함유된 Fe-합금 분말을 기지 금속으로 하여 분말야금공정을 통해 TiC/steel 금속복합재료를 제조하였다. 이후 복합재료의 기계적 물성에 미치는 열처리의 영향을 고찰하고자, 어닐링 열처리 및 칭-템퍼링 열처리를 실시하였다. 인장, 압축 그리고 항절력 시험과 미세조직 분석을 통하여 Cr 함량 및 열처리 조건에 따른 미세조직의 변화와 구조적 강도 변화의 연관성을 고찰하였다. 10 wt.% Cr을 함유한 TiC/steel의 경우, TiC/steel 계면에서 형성된 조대한 Cr carbide의 영향으로 상온 인장강도 및 항절력이 크게 저하하였다. 이에 반해 압축강도에서는 Cr이 3 wt.%, 10 wt.% 함유된 TiC/steel 복합재료 모두 Cr carbide의 유무와 관계없이 어닐링 열처리 시편에 비해 칭-템퍼링 열처리 후 약 4 GPa에 달하는 높은 압축강도를 보였다.

Keywords

Acknowledgement

본 연구는 한국재료연구원이 지원하는 연구과제(PNK7480)로 수행된 것이며, 지원에 대해 진심으로 감사드립니다.

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