The role of oxidation in the wear of plasma nitrided and PVD TiN coated steel

摘要: Abstract The wear behaviour of plasma nitrided En40B steel has been investigated under dry rolling contact with applied sliding traction. Particular attention paid to the examination tribochemical reaction, i.e. oxidation, surface during process. X-ray diffraction, optical and scanning electron microscopes have employed study debris, worn surfaces subsurfaces. Experiments revealed that, as a result hardening effect induced by nitriding, occurred in mild mode via oxidation subsequent removal oxide products, overall rate was dominated surfaces. However, unnitrided subsurface shear deformation, leading severe wear. In order further improve resistance steel, thin, hard titanium nitride (TiN) coating deposited on top ion plating. Such duplex treated possessed superior both deformation tribo-oxidation, thus ensuring minimisation rate.