Authors:
Dmitri Riabov (1), Karin Frisk (2), Sven Bengtsson (1)
1- Höganäs AB, Sweden
2- Innomat AB, Sweden
Abstract:
This work presents the alloy TS-CF1, a new cobalt-free stainless maraging steel designed specifically for laser-based powder bed fusion using a computer-based alloy design approach. The aim was to create a material that easily prints, while performing similarly to the common maraging variant 18Ni-300. After exploring various compositions, we settled on Fe-13.2Cr-9.1Ni-1.1Al-0.6Mo-0.5Nb-0.23Ti-0.5Mn-0.5Si (wt.%). This composition exhibited excellent printability at 40, and 80 µm layer thicknesses with minimal porosity. The precipitation response was assessed by aging at 500 °C, in both as-built and solutioned conditions. A balanced set of properties was reached after aging between 3 and 6 hours, reaching 530 HV5. Different conditions were microstructurally characterized using EBSD and XRD, showing a mostly martensitic structure with some retained austenite. The tensile strength was between 1560 and 1700 MPa, where higher strength was reached by performing a solutioning heat-treatment. Long-term high temperature exposure tests showed good resilience against precipitate coarsening.
DOI:
https://doi.org/10.59499/EP246281567
