The present work aims at investigating the collective function of thermo-reactive diffusion (TRD) and plasma-nitriding duplex coating (vanadium carbide (VC) and vanadium nitride (VC-VN)) on the wear resistance of AISI M2 axial-forming mandrel. TRD process was carried out in molten salt bath furnace at 1020 ± 25°C for 5–6 h and the samples were subjected to vacuum heat treatment process at 1150°C, followed by plasma-nitriding for 1 h at 550°C. Wear properties were examined by subjecting the VC and VC–VN-coated samples to wear test (pin on disc) at normal and elevated temperature (50° and 150°C) with lubrication. Phase composition, surface morphology and elemental mapping were studied through X-ray diffractometer, SEM and EDS analyses, respectively. Study found that the wear resistance of VC-coated samples was higher than VC–VN-coated samples and wear mechanisms for VC and VC–VN coated specimens were assessed to be abrasive and abrasive-oxidative in nature, respectively.
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