This work presents an investigation into the laser cladding process using high power direct diode. The Thesis cobtains six chapters. The chapter one consists of literature survey, the study of corrosion, hardness, wear, and the applicability of lasers in cladding using the rare earth elements. The hybrid cladding techniques and the optimization of the laser cladding parameters are reviewed.
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Chapter two details the laser cladding experiments, the corrosion experiments, and the wear experiments. It also outlines the design of experiments, and the tools and software used in the experiments.
Chapter three presents the optimization of the laser processing parameters. The optimization is performed from three different point of view, namely canonical approach, non-dimensional approach, and the statistical approach. The mathematical and statistical models are developed for the interrelation between the processing parameters in laser cladding. The optimum values of the parameters were concluded for a crack free clad with minimal porosity.
Chapter four describes the corrosion and its types, the electrochemistry of the corrosion, and an in-depth analysis of the corrosion resistance of the 40%Ni-60%WC clad reinforced with rare earth elements La2O3 and CeO2. The data from anodic potentiodynamic polarization experiments was analyzed and the roles of the corrosion current density, the corrosion potential, and the anodic and cathodic slopes were investigated using Tafel extrapolation method. The microstructure, the phases, and the chemical compositions were interpreted and the results were discussed with SEM and XRD spectra.
Chapter five presents the wear and its types, and an in-depth analysis of the wear resistance of the 40%Ni-60%WC clad reinforced with rare earth elements La2O3 and CeO2. The correlation of the microhardness with the modulus of elasticity (H/E ratio) to determine the wear resistance was analyzed.
Chapter six describes the optimization of the laser processing parameters using the cored wire. The optimization is performed with Design Ease software version 11.
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At last, the author has recommended the future study followed by the publications.
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Chapter 2
EXPERIMENTAL SET-UP AND PROCEDURES