Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Complex heat-treatment effects on as-built CoCrMo alloy

적층공정법으로 제작된 CoCrMo 합금의 복합열처리 효과

  • Lee, Jung-Il (Department of Materials Science and Engineering, Korea National University of Transportation) ;
  • Kim, Hung Giun (Korea Institute of Industrial Technology) ;
  • Jung, Kyung-Hwan (Korea Institute of Industrial Technology) ;
  • Kim, Kang Min (Korea Institute of Industrial Technology) ;
  • Son, Yong (Research Institute of Advanced Manufacturing Technology, Korea Institute of Industrial Technology) ;
  • Ryu, Jeong Ho (Department of Materials Science and Engineering, Korea National University of Transportation)
  • 이정일 (한국교통대학교 신소재공학과) ;
  • 김형균 (한국생산기술연구원 강원지역본부) ;
  • 정경환 (한국생산기술연구원 강원지역본부) ;
  • 김강민 (한국생산기술연구원 강원지역본부) ;
  • 손용 (한국생산기술연구원 뿌리산업기술연구소 디지털제조공정그룹) ;
  • 류정호 (한국교통대학교 신소재공학과)
  • Received : 2018.10.24
  • Accepted : 2018.11.09
  • Published : 2018.12.31
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Abstract

The CoCrMo as-built alloys prepared by 3D-printing process are studied on tensile strength, wear resistance, crystal structure and microstructure after complex heat-treatment including HIP. In this study, HIP treatment for removing micropores, ambient heat-treatment for formation of metal carbides, and solution heat-treatment for homogenization of the created metal carbides were tried and characterized for applying to artificial joint. The complex heat-treatment effects of the CoCrMo as-built alloys prepared by 3D-printing process were owing to the densification during HIP, formation of metal carbides and homogenization of the created metal carbides. The effects of the complex heat-treatment were confirmed by XRD, FE-SEM and EDS.

본 연구에서는 3D-프린팅 적층 공정으로 제조한 인공관절용 CoCrMo 합금 소재의 HIP 처리를 포함한 복합열처리 후 소재의 인장특성, 내마모 특성 등의 기계적 특성과 결정구조 및 미세조직 등의 재료특성 변화를 고찰하였다. 내부마이크로 기공을 제거하기 위한 HIP 열처리와 금속탄화물 생성을 위한 상압열처리 및 금속탄화물의 균질화를 위한 용체화 열처리를 거치는 복합열처리 공정을 실시하여 인공관절 소재로서의 특성을 부여하고자 하였다. 3D-프린팅 적층 공정으로 제조한 인공관절용 CoCrMo 합금 소재의 복합열처리 효과는 HIP 공정중의 치밀화 과정, 상압열처리 중의 금속탄화물 생성 및 용체화 열처리 과정중의 금속탄화물의 균질화 효과임을 XRD, FE-SEM, EDS 분석으로 확인하였다.

Keywords

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Fig. 1. Tensile strength and elongation rate of the CoCrMo alloy samples.

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Fig. 2. Vickers and Rockwell hardness of the CoCrMo alloy samples.

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Fig. 3. XRD results of the CoCrMo alloy samples.

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Fig. 4. Optical microscopy pictures of the CoCrMo alloy samples.

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Fig. 5. FE-SEM and EDS results of the CoCrMo alloy sample #1 and #2.

Table 1 Heat-treatment processes of CoCrMo alloy

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Table 2 Atomic concentration of CoCrMo samples analyzed by WD-XRF

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Table 3 Wear resistance properties of the CoCrMo alloy samples

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