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Optimization of the laser remelting process for HVOF-sprayed Stellite 6 wear resistant coatings

  • Cobalt base alloys are used in all industrial areas due to their excellent wear resistance. Several studies have shown that Stellite 6 coatings are suitable not only for protection against sliding wear, but also in case of exposure to impact loading. In this respect, a possible application is the protection of hydropower plant components affected by cavitation. The main problem in connection with Stellite 6 is the deposition procedure of the protective layers, both welding and thermal spraying techniques requesting special measures in order to prevent the brittleness of the coating. In this study, Stellite 6 layers were HVOF thermally sprayed on a martensitic 13-4 stainless steel substrate, as usually used for hydraulic machinery components. In order to improve the microstructure of the HVOF-sprayed coatings and their adhesion to the substrate, laser remelting was applied, using a TRUMPF Laser type HL 124P LCU and different working parameters. The microstructure of the coatings, obtained for various remelting conditions, was evaluated by light microscopy, showing the optimal value of the pulse power, which provided a homogenous Stellite 6 layer with good adhesion to the substrate.

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Author:Costel-Relu Ciubotariu, Doina Frunzaverde, Gabriela Marginean, Viorel-Aurel Serban, Aurel-Valentin Birdeanu
Parent Title (English):Optics & Laser Technology
Document Type:Article
Date of Publication (online):2016/12/13
Year of first Publication:2016
Publishing Institution:Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen
Release Date:2017/01/30
Tag:Stellite 6; HVOF-spraying; Laser remelting; Cavitation erosion; Coatings
First Page:98
Last Page:103
Departments / faculties:Fachbereiche / Maschinenbau und Facilities Management
Licence (German):License LogoEs gilt das Urheberrechtsgesetz

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