 15-5-pitch stainless steel, SS, matrix composites were fabricated by directed energy deposition, DED, and their properties were studied. The addition of TB2, tin, WC, and TIC particles improved the strength and ductility of the composites, but the corrosion resistance was not enhanced due to elemental segregation. The WC and TIC composites achieved a balance between strength, ductility, and corrosion resistance, demonstrating the potential for developing martensitic SS matrix composites with excellent properties. This article was authored by Wei Chen, Lin Yongshu, Yang Kunjong, and others.