A Comparative Study of the Macroscopical and Microscopical Fracture Mechanisms in Cast and Additively Manufactured Austenitic Stainless Steels

摘要

A comparative study of the macroscopical and microscopical fracture mechanisms in cast AISI 321 and wire-feed electron beam additively-manufactured 304-type stainless steels was performed. It was shown that deformation process of additively manufactured specimens develops substantially non-uniformly compared to the cast steel. This is caused by heterogeneity of structure and the presence of δ-ferrite dendrites in austenitic grains of the additively-manufactured specimens unlike to cast steel with fully austenite structure.