Conventionally, metal materials are produced by subtractive manufacturing followed by melting. However, there has been an increasing interest in additive manufacturing, especially metal 3D printing technology, which is relatively inexpensive because of the absence of complicated processing steps. In this study, we focus on the effect of varying powder size on the synthesis quality, and suggest optimum process conditions for the preparation of AlCrFeNi high-entropy alloy powder. The SEM image of the as-fabricated specimens show countless, fine, as-synthesized powders. Furthermore, we have examined the phase and microstructure before and after 3D printing, and found that there are no noticeable changes in the phase or microstructure. However, it was determined that the larger the powder size, the better the Vickers hardness of the material. This study sheds light on the optimization of process conditions in the metal 3D printing field.

Abstract
1. 서 론
2. 실험 방법
3. 실험 결과 및 고찰
    3.1. AlCrFeNi 고엔트로피 합금 분말 특성
    3.2. 3D 프린팅 공정으로 제조된 AlCrFeNi 고엔트로피합금 소결체 특성
    3.3. 혼합 분말을 이용한 3D 프린팅 공정으로 제조된AlCrFeNi 고엔트로피 합금
4. 결 론
References

• 최종우(세종대학교 나노신소재공학과) | Jong Woo Choi (Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea)
• 박혜진(세종대학교 나노신소재공학과) | Hae Jin Park (Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea)
• 강결찬(세종대학교 나노신소재공학과) | Gyeol Chan Kang (Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea)
• 정민섭(세종대학교 나노신소재공학과) | Min Seob Jung (Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea)
• 오기태(세종대학교 나노신소재공학과) | Ki Tae Oh (Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea)
• 홍성환(세종대학교 나노신소재공학과) | Sung Hwan Hong (Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea)
• 김현길(한국원자력연구원 핵연료안전연구부) | Hyun Gil Kim (Nuclear Fuel Safety Division, Korea Atomic Energy Research Institute, 989-111, Daedeok-daero, Yuseong-gu, Daejeon 34057, Republic of Korea)
• 김기범(세종대학교 나노신소재공학과) | Ki Buem Kim (Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea) Corresponding author