Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Influence of Si-rich Phase Morphologies on Mechanical Properties of AlSi10Mg Alloys processed by Selective Laser Melting and Post-Heat Treatment

선택적 레이저 조형된 AlSi10Mg합금의 후열처리에 따른 Si-rich상 형상변화가 기계적 특성에 미치는 영향

  • Nam, Jung-woo (Department for 3D Printing Materials, Korea Institute of Materials Science) ;
  • Eom, Yeong Seong (Department for 3D Printing Materials, Korea Institute of Materials Science) ;
  • Kim, Kyung Tae (Department for 3D Printing Materials, Korea Institute of Materials Science) ;
  • Son, Injoon (Department of Metallurgical Engineering, Kyungpook National University)
  • 남정우 (한국재료연구원 3D프린팅재료연구실) ;
  • 엄영성 (한국재료연구원 3D프린팅재료연구실) ;
  • 김경태 (한국재료연구원 3D프린팅재료연구실) ;
  • 손인준 (경북대학교 신소재공학부)
  • Received : 2021.04.16
  • Accepted : 2021.04.28
  • Published : 2021.04.28
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Abstract

In this study, AlSi10Mg powders with average diameters of 44 ㎛ are additively manufactured into bulk samples using a selective laser melting (SLM) process. Post-heat treatment to reduce residual stress in the as-synthesized sample is performed at different temperatures. From the results of a tensile test, as the heat-treatment temperature increases from 270 to 320℃, strength decreases while elongation significantly increases up to 13% at 320℃. The microstructures and tensile properties of the two heat-treated samples at 290 and 320℃, respectively, are characterized and compared to those of the as-synthesized samples. Interestingly, the Si-rich phases that network in the as-synthesized state are discontinuously separated, and the size of the particle-shaped Si phases becomes large and spherical as the heat-treatment temperature increases. Due to these morphological changes of Si-rich phases, the reduction in tensile strengths and increase in elongations, respectively, can be obtained by the post-heat treatment process. These results provide fundamental information for the practical applications of AlSi10Mg parts fabricated by SLM.

Keywords

Acknowledgement

본 연구는 산업통상자원부 전자시스템전문기술개발사업 '3D 프린팅 전용 Al 소재 국산화 및 25% 경량 프런트 차체모듈 개발(과제번호: 20004486)'과제의 연구지원으로 수행되었습니다.

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