Akademik Veri Yönetim Sistemi
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, cilt.32, sa.16, ss.7527-7544, 2023 (SCI-Expanded)
Monolayer (CrN, AlTiN) and bilayer (CrN/AlTiN) coatings were deposited on the surface of X45CrMoV5-3-1 (DIN 1.2999) tool steel by Cathodic Arc Physical Vapor Deposition (CAPVD). Adhesion of the coatings to substrate was evaluated by scratch tests which indicated that the bilayer coating exhibited better behavior over the monolayers, depending on the load applied either adhesive or cohesive failure was detected. Tribological tests conducted at room temperature (RT) revealed that coatings with better adhesion exhibited lower specific wear rate (6.4 x 10(-6) mm(3)/N.m) and higher coefficient of friction (0.35-0.40). Examination of worn surfaces indicated that the monolayer-coated specimens displayed abrasive wear and spallation, while the bilayer-coated specimen had a smoother surface. Monolayer-coated steels had deeper wear track depths compared to the bilayer-coated material; even though the coatings had been completely removed at the end of the wear tests, the bilayer-coated material survived longer due to its adhesive characteristic. High-temperature (HT) tests were conducted at 450 degrees C in order to simulate the aluminum extrusion conditions, and it was found that higher coefficient of friction values above "1" was observed due to aluminum transfer to the surfaces from the counterpart material. Although cracks were present in CrN coating, only droplet delamination existed in AlTiN and CrN/AlTiN coatings. The results indicated that an integral system consisting of X45CrMoV5-3-1/CrN/AlTiN had superior adhesion and tribological performance compared to monolayer-coated tool steels.