High-Strength 430 ferritic stainless steel fabricated by selective laser melting process.

• SLM-fabricated 430 FSS exhibits significant anisotropy. • SLM-fabricated 430 FSS contains second-phase oxides and high dislocations. • SLM-fabricated 430 FSS exhibits excellent strength with limited plasticity. • SLM-fabricated 430 FSS shows cleavage fractures. This study investigates the microstructure and mechanical properties of 430 ferritic stainless steel (FSS) fabricated via the selective laser melting (SLM) process. The mechanical properties and fracture morphologies of SLM-fabricated 430 FSS and conventional 430 FSS were compared in this paper. It was found that 430 FSS produced by SLM exhibits significant microstructural anisotropy, with higher dislocation density and the presence of oxides of silicon, manganese and aluminum. Regarding mechanical properties, 430 FSS fabricated via SLM process displays higher tensile strength and yield strength, as well as superior product of strength and elongation (PSE) and yield ratio, compared to those produced by conventional methods. Fracture morphology analysis revealed that SLM-fabricated 430 FSS primarily exhibited characteristics of cleavage fractures, whereas conventional 430 FSS showed typical features of ductile fractures. [ABSTRACT FROM AUTHOR]