Abstract
This article deals with the potential to reduce the amount of the residual stresses in the diamond films on cemented carbide inserts for improving their effective interfacial fatigue strength and thus their wear resistance. In this context, nano-crystalline diamond coatings (NCD) were deposited on cemented carbide inserts. A portion of these coated tools were annealed in vacuum for decreasing the amount of residual stresses in the film structure. The annealing temperature was appropriately selected for keeping the substrate strength properties invariable after the coating annealing. Inclined impact tests at ambient temperature on the untreated and heat-treated diamond coated tools were conducted for evaluating their effective interfacial fatigue strength. Depending upon the impact load, after a certain number of impacts, damages in the film-substrate interface develop, resulting in coating detachment and lifting. Via appropriate FEM (Finite Element Method)-evaluation of the impact imprints, the residual stresses in the diamond film structure were determined. Milling experiments were conducted for evaluating the cutting performance of the coated tools using aluminum foam as workpiece material. A correlation between the interfacial fatigue strength of diamond coatings and their residual stresses affected by annealings contributed to the explanation of the attained cutting results.
Highlights
Diamond coatings deposited on cemented carbide tools are widely used in machining of non-ferrous materials like aluminum alloys, composite and so forth [1,2,3,4,5]
The obtained results an impressive of the effective fatigue strength and milling performance of show that an enhancement impressive enhancement of interfacial the effective interfacial fatigue strength and milling diamond coated tools can be achieved by decreasing the structural residual stresses in the diamond performance of diamond coated tools can be achieved by decreasing the structural residual stresses film structure
Whenspecifically, the structural residual stresses are nullified via anare appropriate in the diamondMore film structure
Summary
Diamond coatings deposited on cemented carbide tools are widely used in machining of non-ferrous materials like aluminum alloys, composite and so forth [1,2,3,4,5]. The application of interlayer materials was introduced as an effective technology for enhancing the film adhesion and nucleation densities of diamond coatings on various substrates [4,6,9,10,11]. The potential to change the amount of residual stresses in the diamond film structure via appropriate heat treatment, increasing the effective interfacial fatigue strength as well as the wear resistance of diamond coated tools in milling was investigated. Nano-crystalline diamond (NCD) coatings deposited on cemented carbide tools are characterized by high residual stresses. The high level of residual stresses in the diamond film structure are attributed to epitaxial
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