Enhancement in fatigue performance of metastable austenitic stainless steel through directed energy deposition additive manufacturing

The effect of the as-built microstructure and defect distribution on the fatigue performance of a metastable austenitic stainless-steel fabricated by directed energy deposition was analyzed in two fatigue regimes. Strain localization, porosity, microstructural response, and deformation induced phase transformation were studied for samples parallel and perpendicular to the build direction using digital image correlation, optical surface imaging,...