In this study, additive manufacturing of a functionally graded material (FGM) as an alternative to joining dissimilar metals is investigated using directed energy deposition (DED). FGM consists of five different layers, which are mixtures of austenitic stainless steel (type 316 L) and low-alloy steel (LAS, ferritic steel) at ratios of 100:0 (A layer), 75:25 (B layer), 50:50 (C layer), 25:75 (D layer), and 0:100 (E layer), respectively, in each deposition layer. The FGM samples are successfully fabricated without cracks or delamination using the DED method, and specimens are characterized using optical and scanning electron microscopy to monitor their microstructures. In layers C and D of the sample, the tensile strength is determined to be very high owing to the formation of ferrite and martensite structures. However, the elongation is high in layers A and B, which contain a large fraction of austenite.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
    3.1. DED적층제조된 경사조성재료
    3.2. 경사조성재료의 미세조직
    3.3. 경사조성재료의 기계적 특성
4. 결 론
감사의 글
References

• 신기승(한국원자력연구원 재료안전기술개발부) | G Shin (Materials Safety Technology Development Division)
• 추웅(한밭대학교 신소재공학과) | W Choo (Department of Materials Science and Engineering, Hanbat National University)
• 윤지현(한국원자력연구원 재료안전기술개발부) | J H Yoon (Materials Safety Technology Development Division, Korea Atomic Energy Research Institute)
• 양승용(한국기술교육대학교 기계공학부) | S Y Yang (Korea University of Technology and Education) Corresponding author
• 김정한(한밭대학교 신소재공학과) | J H Kim (Department of Materials Science and Engineering, Hanbat National University) Corresponding author