Download PDFOpen PDF in browserTribochemical Analysis of Metal Nitride Coatings Sliding Against Hardened Steel for Cutting Tool Applications7 pages•Published: August 6, 2026AbstractEvaluation of coating wear during machining is often complicated by the simultaneous occurrence of multiple failure modes such as chipping, flaking, and edge fracture. These co-existing mechanisms make it difficult to probe fundamental wear behavior. In this work, a pin-on-disc tribological test is employed as a proxy to study the tribo-chemical reactions relevant to steel machining by matching critical contact pressures and sliding velocities. Cemented carbide tools and hemispherical pins, all of which were coated with TiN, TiAlN, or AlCrN, were evaluated by machining as well as tribological tests under dry conditions. The resulting reaction products were characterized using micro-Raman spectroscopy on worn tool surfaces, machining chips, pins, and disc wear tracks.Results reveal that Fe3O4 is the dominant oxide phase in both environments, with little Fe2O3 formation depending on the specific coating and local contact conditions. This close correspondence in oxide phases indicates that the tribo-chemical reactions of machining can be replicated under controlled laboratory conditions. Thus, pin-on-disc tribometry may be recommended as a practical, efficient method for evaluating coating performance and oxidative wear while bypassing the complexity of elaborate machining experiments. Keyphrases: coating wear, machining, pvd, raman spectroscopy, tribochemistry In: Numpon Mahayotsanun (editor). Proceedings of The 11th International Conference on Tribology in Manufacturing Processes & Advanced Surface Engineering, vol 4, pages 83-89.
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