Effect of cooling rate on the phase evolution of ۳۱۶L stainless steel deposited by wire and arc additive manufacturing

Wire and arc additive manufacturing (AM) can be used for cladding, e.g., ۳۱۶L stainless steel in order to improve surface quality. In this study, ۳۱۶L was deposited on a substrate with the similar composition to investigate the effect of heat input and cooling rate. In this regard, three beads with different heat inputs of ۲۵۰, ۲۰۰, and ۱۵۰ J/mm were printed. The cooling rates calculated by SYSWELD software were about ۱۶۷, ۹۱, and ۳۸۰ ℃𝑠⁄ for ۲۵۰-bead, ۲۰۰-bead, and ۱۵۰-bead, respectively. The microstructural study showed that as the cooling rate increased, the delta ferrite increased and sigma phase volume fraction decreased. In addition, dendrite arm spacing also varied with cooling rate, and it was ۷۳.۲, ۷۵.۰, and ۴۶.۹ 𝜇𝑚 for ۲۵۰, ۲۰۰, and ۱۵۰-bead, respectively shows coincidence with cooling rate. Also, beads geometry were studied for beads with different cooling rate.

کلیدواژه ها:

cooling rate ، simulation ، wire and arc additive manufacturing ، ۳۱۶L stainless steel