| dc.description | The hot stamping process consists to heat the steel blank, at total austenitization
temperatures and to transfer it into the press tooling for forming and fast cooling to fully martensitic
transformation. This transference from furnace to press stage promotes some steel oxidation. The
application of metallic coatings avoids this phenomenon. The Al-Si coating, a patented process, has
been the most applied on steel. Hence, alternative coatings like Zn-Ni are under development. It is
known that this furnace heating causes chemical elements diffusion that results in intermetallics
formation. This study had the objective of analyze the diffusion profiles of chemical elements
present in the substrate, 22MnB5 steel, and coatings of Al-Si and Zn-Ni, using glow-discharge
optical emission spectroscopy - GDOES and to correlate the results with those obtained with energy
dispersive X-ray spectroscopy - EDS. The results showed that for the Zn-Ni sample, the Zn and Fe
profiles at the interfacial zone, are predominant; which justify the high proportion of ZnFe phases as
showed using scanning electron microscopy - SEM images. For the Al-Si sample at the interfacial
zone, the profile of Al and Fe varies simultaneously; besides that, silicon diffusion in the substrate
is more effectively than the nickel diffusion. For this reason, it was possible to identify AlFeSi
phase near to the steel substrate. | |
