Nano-scale duplex high entropy alloys produced by additive manufacturing - NADEA

Project summary

NADEA will develop a nano-scale duplex material starting from a Co-free high entropy alloy while taking advantage of a unique phase transformation pathway via spinodal decomposition of the primary BCC-phase and concomitant FCC-formation. The novel material shall out-pass duplex or super-duplex steels and provide a significant strength increase and good corrosion resistance for centrifugal pump impellers. AM-manufacturing of impellers is envisaged by Laser Metal Deposition (LMD) and Selective Laser Melting (SLM). They both offer extraordinary means to tailor the primary grain size throughout the component, thus improving the material’s resistance to cleavage fracture. The entire process chain from powder production to demonstrator manufacturing and testing will be developed from TRL2 to TRL4 including alloy design, microstructure modelling, process development and the analysis of mechanical and corrosion properties.