한국기계가공학회지 (Journal of the Korean Society of Manufacturing Process Engineers)

  • 제21권3호
  • /
  • Pages.12-21
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  • 2022
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  • 1598-6721(pISSN)
  • /
  • 2288-0771(eISSN)
한국기계가공학회 (The Korean Society of Manufacturing Process Engineers)
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내열 금형강 DED 금속적층재의 조직, 결함 및 기계적 물성 평가

Microstructure, Defects and Mechanical Properties of DED Metal Deposited Heat-Resistant Mold Steel

  • 최성종 (안동대학교 신뢰성교육연구센터) ;
  • 김호찬 (안동대학교 기계자동차공학과)
  • Choi, Sung-Jong (Education and Research Center for Reliability, Andong UNIV.) ;
  • Kim, Ho-Chan (Department of Mechanical and Automotive Engineering, Andong UNIV.)
  • 투고 : 2022.01.18
  • 심사 : 2022.02.15
  • 발행 : 2022.03.31
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초록

Directed energy deposition (DED) was adopted as a metal additive manufacturing method to develop a mold for the hot stamping process. The test piece was machined from Heatvar laminate material, and results were obtained through microstructure and defect observations, as well as hardness, tensile strength, and joint strength tests. 1) Spherical pores and irregular-shaped cavities were observed as lamination defects, and columnar dendrites formed in the structure, which tended to become coarse upon heat treatment. 2) The hardness of the heat-treated material (480HV) was slightly lower than that of the non-heat-treated material (500HV). 3) In the tensile test, the maximum tensile stress and strain of the heat-treated material were 1392 MPa and 15%, respectively, which were slightly higher than the values of 1381 MPa and 13%, respectively, for the non-heat-treated material. 4) In the case of the early final fracture in the tensile test, in most cases, pores or irregularly shaped cavities were observed at the fracture surface or near the surface. 5) In the joint strength test, most of the specimens finally fractured in the laminated metal area, and the fracture surface was intragranular. In addition, dimples formed over the entire area on the fracture surface of the fractured specimen after sufficient elongation.

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과제정보

이 논문은 2020년도 안동대학교 학술조성연구비 지원에 의하여 연구되었습니다. 또한 본 연구를 위한 시험편 제작에 협조하여 주신 (주)맥스로텍 관계자분들에게 진심으로 감사드립니다.

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