Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Particle Sphericity on the Rheological Properties of Ti-6Al-4V Powders for Laser Powder Bed Fusion Process

LPBF용 타이타늄 합금 분말의 유변특성에 대한 입자 구형도의 영향

  • Kim, T.Y. (School of Materials Science and Engineering, Pusan National University) ;
  • Kang, M.H. (School of Materials Science and Engineering, Pusan National University) ;
  • Kim, J.H. (Titanium Department, Korea Institute of Materials Science (KIMS)) ;
  • Hong, J.K. (Titanium Department, Korea Institute of Materials Science (KIMS)) ;
  • Yu, J.H. (Powder Materials Division, Korea Institute of Materials Science (KIMS)) ;
  • Lee, J.I. (School of Materials Science and Engineering, Pusan National University)
  • 김태윤 (부산대학교 재료공학과) ;
  • 강민혁 (부산대학교 재료공학과) ;
  • 김재혁 (한국재료연구원 타이타늄연구실) ;
  • 홍재근 (한국재료연구원 타이타늄연구실) ;
  • 유지훈 (한국재료연구원 분말재료연구본부) ;
  • 이제인 (부산대학교 재료공학과)
  • Received : 2022.03.11
  • Accepted : 2022.04.11
  • Published : 2022.04.28
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Abstract

Powder flowability is critical in additive manufacturing processes, especially for laser powder bed fusion. Many powder features, such as powder size distribution, particle shape, surface roughness, and chemical composition, simultaneously affect the flow properties of a powder; however, the individual effect of each factor on powder flowability has not been comprehensively evaluated. In this study, the impact of particle shape (sphericity) on the rheological properties of Ti-6Al-4V powder is quantified using an FT4 powder rheometer. Dynamic image analysis is conducted on plasma-atomized (PA) and gas-atomized (GA) powders to evaluate their particle sphericity. PA and GA powders exhibit negligible differences in compressibility and permeability tests, but GA powder shows more cohesive behavior, especially in a dynamic state, because lower particle sphericity facilitates interaction between particles during the powder flow. These results provide guidelines for the manufacturing of advanced metal powders with excellent powder flowability for laser powder bed fusion.

Keywords

Acknowledgement

본 연구는 2022년도 산업통상자원부 및 산업기술평가관리원(KEIT) 연구비 지원(20013202)과 2019년도 부산대학교 신임교수연구 정착금 지원으로 이루어졌습니다.

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