Evaluation of the Mechanical Properties and the Corrosion Resistance of the Cobalt-Base Alloy Stellite 6 on 1045 Steel by Laser Cladding
Received: 20 February 2025 | Revised: 19 March 2025 | Accepted: 5 April 2025 | Online: 4 June 2025
Corresponding author: Nguyen Van Cuong
Abstract
This study investigates the optimization of laser cladding parameters for Stellite 6 coatings on 1045 steel through experimental trials, ensuring the selected parameters, such as laser power, scanning speed, and powder feed rate, are optimized under realistic processing conditions. The results demonstrate significant improvements in coating performance. The optimized process produced a refined dendritic microstructure with a uniform distribution of Co-γ and Cr7C3 phases, effectively minimizing defects and improving mechanical stability. The coating exhibited a 2.8-fold increase in microhardness compared to the uncoated substrate, translating to significantly improved wear resistance. Additionally, electrochemical corrosion tests in a 3.5 wt.% NaCl solution showed a 200-fold reduction in corrosion rate and a protection efficiency of 99.75%, surpassing previously reported coatings that suffered from excessive dilution and phase inhomogeneity. These findings underscore the potential of experimentally optimized laser cladding to significantly enhance the durability and functional performance of Stellite 6 coatings.
Keywords:
laser cladding, Stellite 6, microstructure, microhardness, electrochemical corrosionDownloads
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