Abstract
2205 Duplex stainless steel components were built using gas atomized powder ((D90 < 45 μm) via selective laser melting The relative density of the annealed component manufactured with optimal processing conditions was 99.1 ± 0.3%. Annealing restored the duplex microstructure. A comparison of electron backscatter diffraction, optical microscopy, and magnetometer phase analysis techniques was done yielding ferrite contents of 51.7 ± 0.7%, 53.0 ± 4.8%, and 55.7 ± 1.0%, respectively. The grain orientation was influenced by the layerwise building and scan strategy. The as-built and annealed ferrite grains showed [001] texture. The austenite had mixed orientation. The measured microhardness of 258 ± 8 HV on the SLM sample was comparable to wrought alloys, but the ultimate tensile strength (622 ± 19 MPa) and % elongation (21.3 ± 1.4%) were inferior. Segregation of Cr was observed in as-built components, and Si/Mn in annealed components.
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