Aktualisiert: 23. Nov. 2021
The next big step was to have a tailored test melt made. Larrin used his experience in steel design to create the final alloy composition that became ApexUltra. The first 20kg produced with this composition were molten in a vacuum induction furnace at the University of Leoben. The yield was small, even smaller after trimming the billet to its filet pieces which left just a quarter of the starting material – but enough to make samples and a few first test knives to test its performance and processability by experienced bladesmiths. Tobias Hangler forged and rolled out the material and conducted different heat treatments on the steel. A first quick metallographic sample was done to ensure the quality of the steel was up to the expectations.
Here is a first look at the heat treated microstructure of ApexUltra.
Vacuum induction melt:
First glimpse on the solid steel after casting:
Cutting the block after annealing it to a more managable size:
Surface ground samples: