Wear behavior of multilayer coated carbide tools in finish dry hard turning

The aim of this study is to explore wear behaviors of carbide tools with a multilayer TiCN + Al2O3 + TiN coating on AISI-4340 and AISI-52100 hardened steel substrates generated by the medium temperature chemical vapor deposition (MTCVD) method in finish dry hard turning. Microscopic and microstructural wear aspects of multilayer-coated carbide tips were quantified at three cutting speeds using a constant feed rate of 0.027 mm × rev−1 and a constant cutting depth of 0.2 mm. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to investigate worn tool surfaces, wear products and wear mechanisms. Wear mechanisms observed involved abrasion, adhesion, plastic flow, material transfer and tribochemical effects depending on mechanical and thermal conditions generated on the wear zones. Transfer layer formation with different morphologies was distinguished to occur at the rake-chip interface.