Deformation–wear transition map of DLC coating under cyclic impactloading

Abdollah, Mohd Fadzli bin (2012) Deformation–wear transition map of DLC coating under cyclic impactloading. Wear, 27 (-). pp. 435-441. ISSN 0043-1648

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A new deformation–wear transition map of hydrogen-free amorphous carbon coating(commonly known as Diamond-Like Carbon(DLC)coating)on tungsten high speed steel(SKH2)substrate under cyclic impact loading has been proposed to clarify the interactions of the operating parameters,deformation and wear. The study was carried out using an impact tester,under lubricated conditions over a wide range of impact cycles, and applied normal loads. SKH2 discs were coated with thin DLC films using a Physical Vapor Deposition (PVD) method. Tungsten (W) was used as an interlayer material. The DLC coated disc was impacted repeatedly by a chromium molybdenum steel(SCM420) pin. All impacttests were conducted at room temperature. It has been suggested that the deformation–wear transition map is an easy way to illustrate the impact wear mechanisms of DLC coating, as shown by its transition zones. Initially,the DLC coating only follows the plastic deformation of the substrate until several impact cycles. Then, a suppression of plastic deformation of the substrate is taking place due to the decreasing contact pressure with impact cycles to the yield point.Wear ofthe DLC coating becomes dominant when the critical limit of maximum normal impactload and impact cycles is exceeded. From experimental observations, some degradation ofthe DLC coating occurs within the wear zone.

Item Type: Article
Uncontrolled Keywords: Impact testing, DLC coating, Deformation–wear transition map, Impact wear mechanisms
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Mechanical Engineering > Department of Automotive
Date Deposited: 13 Aug 2013 11:18
Last Modified: 14 Feb 2022 12:24
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