Nitrogen-Enhanced Martensitic Cr Steel: Advancing Strength, Corrosion Resistance, and Sustainability in Additive Manufacturing

The range of martensitic Cr steels that can currently be processed with PBF-LB/M is considerably limited. In order to expand and optimize the alloy portfolio of this alloy category, the qualification of a corrosion resistant martensitic Cr-steel with good processability for additive manufacturing is the focus of this study. The study covers the entire process chain from alloy development based on X50CrMoV15 steel, powder production via gas atomization, additive manufacturing using PBF-LB/M and microstructural investigations. Nitrogen is the key element in this concept as it can have a positive effect on strength, ductility and corrosion resistance and environmental footprint. In addition, N improves susceptibility to cold cracking in melt based additive manufacturing processes by reducing the MS temperature.