Characterization for repeated impact resistance of TiN tool coatings

doi:10.16731/j.cnki.1671-3133.2018.07.018

Abstract

Abstract: The tool coatings have been widely applied in machining field and their evaluation methods are being gain more attention.Existing evaluation methods for tool coating characterization such as the microhardness,scratch and indentation test can simulate the failure behaviors under static loads.However,these methods are hard to characterize the tool coating performances such as impact resistance under dynamic forces caused by impact loads.In this paper,TiN tool coatings were repeatedly impacted using a specially designed impact tester driven by piezoelectric actuator.Experimentation and analysis concerning failure mechanism and repeated impact resistance were presented.Coating fracture initiation and propagation mechanism for TiN tool coatings under repeatedly impact test were studied.Experimental results indicate that the failure mechanism transform from cohesive failure to adhesive failure with the increase of impact cycles.The fracture initiation of TiN tool coatings can be characterized by oxidation wear and the fracture propagation rate can be evaluated by failed area ratio.The results of this research provide the characterization of tool coating performance and detailed explanation for failure mechanism with repeated impact loadings,which can be applied to the optimization of the tool coating materials and the strengthening coating performance evaluation with micro-blasted post treatment.

Key words: TiN tool coatings, impact resistance, piezoelectric actuator

CLC Number:

TG711
O484.4

Liu Canyu, Liu Zhanqiang. Characterization for repeated impact resistance of TiN tool coatings[J]. Modern Manufacturing Engineering, 2018, 454(7): 105-111.

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