Additively manufactured δ-ferrite-free 410 stainless steel with desirable performance

The 410 stainless steel (SS410) large-size block part without defects was successfully prepared by cold metal transfer (CMT) wire-arc additive manufacturing (WAAM). Results showed that 5-ferrite in SS410 could be eliminated during deposition without any extra post-treatment. The content of martensite in the central zone and overlap zone both exceeded 96%, and the rest was punctate austenite. The average strength/elongation of the as-deposited (AD) block part was 1323 MPa/4.1%. By comparing the tensile properties of AD samples with low-temperature annealing (LA), full annealing (FA), and high temperature tempering (HT) post-heat-treated samples, the HT could achieve the best balance of strength and ductility with an elongation about 12.7%. This work proved that the high-performance parts could be prepared through WAAM by using appropriate processing parameters. (C) 2021 Published by Elsevier B.V.

Automated summary

A large-size block part of SS410 stainless steel was successfully prepared without defects using the cold metal transfer (CMT) wire-arc additive manufacturing (WAAM) process. The as-deposited (AD) block part showed a high strength/elongation ratio, and high temperature tempering (HT) post-heat treatment achieved the best balance of strength and ductility. This work demonstrates the potential of WAAM in producing high-performance parts with appropriate processing parameters.