Effect of the surface texturing treatment with Nd:YAG laser on the wear resistance of CoCr alloy
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.397
Effect of the surface texturing treatment with Nd: YAG laser on the wear resistance of CoCr alloy I.A. Ortega-Ramos1, M. Alvarez-Vera1*, J.L. Acevedo-Dávila1, H.M. Hdz-García1, R. Muñoz-Arroyo1 1
Corporación Mexicana de Investigación en Materiales S.A. de C.V., Ciencia y Tecnología No. 790 Fracc. Saltillo 400, C.P. 25290 Saltillo, Coahuila, México
*Corresponding Author: [email protected], [email protected]
ABSTRACT
The present work aims to explore the tribological behavior of the laser texturing process with different patterns on a Co based alloy using a pulsed Nd: YAG laser. Different parameters such as peak power, speed and spot diameter of the laser were explored for the experimental setting. The microstructural analysis was performed using scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and nanoindentation tests. The influence of the different textured patterns of the tribological performance tested with a pin-on-disc tribometer under lubricated sliding condition was evaluated. The results showed that typical interdendritic structures in the as-cast CoCr alloy condition were refined due to the heat input and fast cooling rate during the laser treatment. The refined microstructure showed less volumetric loss resulting in a increment of wear resistance and a better tribological performance than as-cast alloy. The correlation among laser parameters, microstructural effect and their influence in wear resistance is discussed.
1. INTRODUCTION Cobalt base alloys are used in several industrial applications: gas turbine [1], medical devices [2], aerospace [3] and nuclear parts [4], due to their inherent properties such as corrosion resistance, high-strength and their hardness at elevated temperatures [5]. The enhance of the mechanical properties of the CoCr alloy remains as an important theme of study for these applications [6]. In order to improve the tribological properties of these alloys, surface and coating processes have been investigated. Boronizing increases wear resistance due the
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high surface hardness of the borides formed externally along the process [2], PVD coating [7] and plasma nitriding [8] provides thin films to enhance superficial properties. Laser surface modification processes have a reduced heat affected zone and a minimal substrate distortion due to the high energy density of the laser [9]. Laser texturing adds a surface texture by dimple generation with minimal deformation effects. This texture with circular shapes reduces third body abrasion minimize while creates a better wetting condition that protects the contact surface [10]. Additionally, wear diminish effect owing to the dimples action as a wear debris
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