Abstract
In this study, the experimental results of dry, high speed turning of AISI 304 austenitic stainless steels using nanocrystalline AlTiCrN coated cemented carbide insert are presented. High power pulsed magnetron sputtering (HPPMS) and cathodic arc evaporation (CAE) techniques were used to deposit nanocrystalline AlTiCrN coating on fine grained K grade cemented carbide insert. The composition and microstructure of the deposited nanocrystalline AlTiCrN coatings were analysed using SEM. In addition, the adhesion and microhardness of the coatings were evaluated. Fine grained appearance with dense columnar structure was observed for the coating deposited by HPPMS technique. Microhardness values for nanocrystalline AlTiCrN coating deposited by HPPMS and CAE techniques were found to be 35 and 37 GPa respectively for the thickness of 4·2 μm. The effect of cutting speed and feed on the tool wear was investigated. HPPMS coated tool exhibited tool life of 24 min, whereas CAE coated tool exhibited tool life of 15 min for the same conditions.
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