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E. Aschauer, H. Riedl, C.M. Koller, H. Bolvardi, M. Arndt, P. Polcik, P.H. Mayrhofer:
"Adhesive wear formation on PVD coated tools applied in hot forming of Al-Si coated steel sheets";
Wear, 430-431 (2019), 0043-1648; 309 - 316.

The present study investigates the performance of four selected PVD coating materials in application near hot-forming procedure of Al-Si coated 22MnB5 steel sheets. These are: a Ti0.57Al0.43N/Mo-Si-B multilayer, a TiN base layer having a Mo-Si-B top layer, a DLC, and an Al-Cr-O coating. We determined the amount of adherent material (after the hot-forming procedure) by 3D topographical analysis and characterised the build-up volume as well as the coating/build-up interface constitutions with respect to the diffusivity of the participating elements. The smallest build-up volume could be identified for the Ti0.57Al0.43N/Mo-Si-B multilayer as well as the DLC coating, whereas the highest adhesive wear peak-value during the whole testing sequence was detected for the Al-Cr-O coating. Based on detailed TEM analysis of the diffusion zones (between build-ups and coating materials), we can conclude that the smallest adhesive wear is obtained, if the interface formation (between build-up and coatings) is narrow and Fe-free or at least Fe-lean.

Adhesive wear; Galling; Aluminium diffusion; PVD; Hot forming;

http://dx.doi.org/10.1016/j.wear.2019.05.019