논문 국내 국내전문학술지(KCI급) 레이저 빔 직경 변화에 따른 17-4 PH 스테인리스 강 DED 적층 조형체의 미세조직 및 경도 변화
- 학술지 구분 국내전문학술지(KCI급)
- 게재년월 2022-08
- 저자명 김정한,김우혁,고의준
- 학술지명 한국분말재료학회지
- 발행처명 한국분말재료학회
- 발행국가 국내
- 논문언어 한국어
- 전체저자수 3
홈페이지논문 초록 (Abstract)
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.