Lightweight steel is a crucial material that is being actively studied because of increased carbon emissions, tightening regulations regarding fuel efficiency, and the emergence of UAM, all of which have been recently labeled as global issues. Hence, new strategies concerning the thickness and size reduction of steel are required. In this study, we manufacture lightweight steel of the Fe-Mn-Al-C system, which has been recently studied using the DED process. By using 2.8 wt.% low-Mn lightweight steel, we attempt to solve the challenge of joining steel parts with a large amount of Mn. Among the various process variables, the laser scan power is set at 600 and 800W, and the laser scan speed is fixed at 16.67 mm/s before the experiments. Several pores and cracks are observed under both conditions, and negligibly small pores of approximately 0.5 μm are observed.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
4. 결 론
감사의 글
References

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• 설재복(경상국립대학교 나노신소재융합공학과, 경상국립대학교 K-metal) | Jae Bok Seol (Department of Materials Engineering and Convergence Technology, Gyeongsang National University(GNU),Department of Materials Engineering and Convergence Technology, Center for K-metal, Gyeongsang National University (GNU)) Corresponding author