한국재료학회지 (Korean Journal of Materials Research)

  • 제28권11호
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  • Pages.663-670
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  • 2018
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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적층 제조된 H13 공구강의 미세조직과 기계적 특성간의 상관관계

Correlation between Microstructure and Mechanical Properties of the Additive Manufactured H13 Tool Steel

  • 안우진 (경상대학교 나노신소재융합공학과) ;
  • 박준혁 (경상대학교 나노신소재융합공학과) ;
  • 이정섭 (경상대학교 나노신소재융합공학과) ;
  • 최중호 (한국기계연구원 부설 재료연구소, 분말/세라믹연구본부) ;
  • 정임두 (한국기계연구원 부설 재료연구소, 분말/세라믹연구본부) ;
  • 유지훈 (한국기계연구원 부설 재료연구소, 분말/세라믹연구본부) ;
  • 김상식 (경상대학교 나노신소재융합공학과) ;
  • 성효경 (경상대학교 나노신소재융합공학과)
  • An, Woojin (Department of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University) ;
  • Park, Junhyeok (Department of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University) ;
  • Lee, Jungsub (Department of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University) ;
  • Choe, Jungho (Powder & Ceramics Division, Korea Institute of Materials Science) ;
  • Jung, Im Doo (Powder & Ceramics Division, Korea Institute of Materials Science) ;
  • Yu, Ji-Hun (Powder & Ceramics Division, Korea Institute of Materials Science) ;
  • Kim, Sangshik (Department of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University) ;
  • Sung, Hyokyung (Department of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University)
  • 투고 : 2018.09.08
  • 심사 : 2018.10.17
  • 발행 : 2018.11.27
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초록

H13 tool steels are widely used as metallic mold materials due to their high hardness and thermal stability. Recently, many studies are undertaken to satisfy the demands for manufacturing the complex shape of the mold using a 3D printing technique. It is reported that the mechanical properties of 3D printed materials are lower than those of commercial forged alloys owing to micropores. In this study, we investigate the effect of microstructures and defects on mechanical properties in the 3D printed H13 tool steels. H13 tool steel is fabricated using a selective laser melting(SLM) process with a scan speed of 200 mm/s and a layer thickness of $25{\mu}m$. Microstructures are observed and porosities are measured by optical and scanning electron microscopy in the X-, Y-, and Z-directions with various the build heights. Tiny keyhole type pores are observed with a porosity of 0.4 %, which shows the lowest porosity in the center region. The measured Vickers hardness is around 550 HV and the yield and tensile strength are 1400 and 1700 MPa, respectively. The tensile properties are predicted using two empirical equations through the measured values of the Vickers hardness. The prediction of tensile strength has high accuracy with the experimental data of the 3D printed H13 tool steel. The effects of porosities and unmelted powders on mechanical properties are also elucidated by the metallic fractography analysis to understand tensile and fracture behavior.

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