• 제목/요약/키워드: 17-4PH 스테인리스 강

검색결과 2건 처리시간 0.016초

PBF와 DED 공정으로 제조된 17-4PH 스테인리스 강의 미세조직 및 기계적 특성 평가 (Evaluation of Microstructure and Mechanical Properties in 17-4PH Stainless Steels Fabricated by PBF and DED Processes)

  • 윤종천;이민규;최창영;김동혁;정명식;최용진;김다혜
    • 한국기계가공학회지
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    • 제17권2호
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    • pp.83-88
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    • 2018
  • Additive manufacturing (AM) technologies have attracted wide attention as key technologies for the next industrial revolution. Among AM technologies using various materials, powder bed fusion (PBF) processes and direct energy deposition (DED) are representative of the metal 3-D printing process. Both of these processes have a common feature that the laser is used as a heat source to fabricate the 3-D shape through melting of the metal powder and solidification. However, the material properties of the deposited metals differ when produced by different process conditions and methods. 17-4 precipitation-hardening stainless steel (17-4PH SS) is widely used in the field of aircraft, chemical, and nuclear industries because of its good mechanical properties and excellent corrosion resistance. In this study, we investigated the differences in microstructure and mechanical properties of deposited 17-4PH SS by PBF and DED processes, including the heat treatment effect.

레이저 빔 직경 변화에 따른 17-4 PH 스테인리스 강 DED 적층 조형체의 미세조직 및 경도 변화 (Effect of Laser Beam Diameter on the Microstructure and Hardness of 17-4 PH Stainless Steel Additively Manufactured by Direct Energy Deposition)

  • 김우혁;고의준;김정한
    • 한국분말재료학회지
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    • 제29권4호
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    • pp.314-319
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    • 2022
  • The effect of the laser beam diameter on the microstructure and hardness of 17-4 PH stainless steel manufactured via the directed energy deposition process is investigated. The pore size and area fraction are much lower using a laser beam diameter of 1.0 mm compared with those observed using a laser beam diameter of 1.8 mm. Additionally, using a relatively larger beam diameter results in pores in the form of incomplete melting. Martensite and retained austenite are observed under both conditions. A smaller width of the weld track and overlapping area are observed in the sample fabricated with a 1.0 mm beam diameter. This difference appears to be mainly caused by the energy density based on the variation in the beam diameter. The sample prepared with a beam diameter of 1.0 mm had a higher hardness near the substrate than that prepared with a 1.8 mm beam diameter, which may be influenced by the degree of melt mixing between the 17-4 PH metal powder and carbon steel substrate.