Abstract
In this work, the machining performances of TiN + AlCrN coated tungsten carbide (WC) and Al2O3+TiC mixed ceramic inserts for turning of AISI 4140 steel were systematically evaluated by multivariate analysis of variance (MANOVA) with varying cutting speeds in the range of 150−220 m/min. MANOVA results showed that the averages surface roughness of workpiece and flank wear width of tool were significantly affected by the cutting speed, the type of inserts and their interaction at the significant level of 0.05. Additionally, the method of Bonferoni 95 % simultaneous confidence intervals for pairwise comparisons indicated that the cutting speed of 220 m/min was suitable for turning of AISI 4140 steel with both types of inserts. Microanalysis based on electron microscopy revealed that the Al2O3+TiC inserts experienced mild abrasion via microploughing, microcutting and microchipping while TiN + AlCrN coated WC ones got severe abrasive wear due to direct cutting and three-body abrasion.
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