Laser Additive Manufacturing of Duplex Stainless Steel via Powder Mixture

Laser additively manufactured duplex stainless steels contain mostly ferrite in the as-built parts due to rapid solidification of printed layers. To achieve microstructures (ferrite and austenite roughly equal proportions) and, thus, a good combination mechanical properties corrosion resistance, an austenitic steel powder (X2CrNiMo17-12-2) super (X2CrNiMoN25-7-4) were mixed different proportions mixtures processed via PBF-LB/M (Laser Powder Bed Fusion) under various processing conditions by varying laser power scanning speed. The optimal process parameters for dense determined means light optical microscopy density measurements. ferritic phase formation alloys was significantly influenced chemical composition adjusted mixing energy input during PBF-LB/M. content increases, on one hand, with increasing proportion X2CrNiMo17-12-2 other hand input. latter phenomenon could be attributed slower higher melt pool homogeneity influencing cooling. desired achieved X2CrNiMoN25-7-4 at specific ratio building parameters.