Effect of carbon content in steel powder feedstock on impact toughness and microstructure of additively manufactured cast iron by directed energy deposition

Low- and medium-C steel powders were additively deposited on gray cast iron using a directed energy deposition (DED) process to identify the effect of the carbon content in the steel powder on the soundness of DED-processed cast iron in terms of the mechanical and microstructural properties. As a representative mechanical property, impact toughness tests of DED-processed cast iron specimens were performed, and then fractography was employed to...