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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 (한밭대학교 신소재공학과) ;
  • 고의준 (한밭대학교 신소재공학과) ;
  • 김정한 (한밭대학교 신소재공학과)
  • Kim, Woo Hyeok (Department of Materials Science & Engineering, Hanbat National University) ;
  • Go, UiJun (Department of Materials Science & Engineering, Hanbat National University) ;
  • Kim, Jeoung Han (Department of Materials Science & Engineering, Hanbat National University)
  • 투고 : 2022.08.13
  • 심사 : 2022.08.25
  • 발행 : 2022.08.28

초록

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.

키워드

참고문헌

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