Abstract
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 δ-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.
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