Thermal Fatigue Resistance Studies of Multilayer CrN and AlTiN Coatings Deposited on Plasma Nitrided H-13 Hot Work Steel

H-13 steel surface was duplex-treated using Plasma Nitriding (PN) and PVD coatings to solve the thermal fatigue problem faced in die-casting applications. Chromium-based multilayer CrN/Cr (m-CrN) multi-component aluminium–titanium-based AlTiN (m-AlTiN) were deposited a cathodic arc deposition technique after plasma nitriding with different case-depths of 50 µm 200 µm. The structural, tribological, corrosion, mechanical properties samples studied. (TF) test conducted by heating sample 600 °C rapidly cooling it room temperature, simulating process conditions. After multiple cycles, observed that oxide layer thickness formed lower on compared uncoated nitride sample. In addition, improved increase PN diffusion depth. showed better untreated only coated samples. m-AlTiN nitrided case depth displays other