Additive manufacturing (AM) is a highly innovative method for joining dissimilar materials for industrial applications. In the present work, AM of STS630 and Ti-6Al-4V powder alloys on medium entropy alloys (MEAs) NiCrCo and NiCrCoMn is studied. The STS630 and Ti64 powders are deposited on the MEAs. Joint delamination and cracks are observed after the deposition of Ti64 on the MEAs, whereas the deposition of STS630 on the MEAs is successful, without any cracks and joint delamination. The microstructure around the fusion zone interface is characterized by scanning electron microscopy and X-ray diffraction. Intermetallic compounds are formed at the interfacial regions of MEA-Ti64 samples. In addition, Vicker’s hardness value increased dramatically at the joint interface between MEAs and Ti-6Al-4V compared to that between MEAs and STS630. This result is attributed to the brittle nature of the joint, which can lead to a decrease in the joint strength.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
    3.1 적층조형 시료의 거시 관촬
    3.2 적층조형 시료의 미세조직 분석
    3.3 마이크로 빔 XRD 분석
    3.4 마이크로 비커스 경도 실험 & Line scanning profiles
4. 결 론
References

• 박찬웅(한밭대학교 신소재공학과) | Chan Woong Park (Department of Materials Science & Engineering, Hanbat National University)
• Nana Kwabena Adomako(한밭대학교 신소재공학과)
• 이민규(한국생산기술연구원 대경지역본부 극한가공기술그룹) | Min Gyu Lee (Ultimate Fabrication Technology Group, Korea Institute of Industrial Technology Daegyeong Regional Division)
• 김정한(한밭대학교 신소재공학과) | Jeoung Han Kim (Department of Materials Science & Engineering, Hanbat National University) Corresponding Author