Abstract
The feasibility of laser clad glass coating on carbon steel substrate is investigated. With a suitable selection of laser processing variables, thin, dense and crack-free glass coating has been obtained with excellent adhesion and good surface integrity. Cracking-inhibition of glass coating during laser cladding is attributed to the visco-elastic deformation that the glass phase undergoes in the course of solidification above the softening temperature by relieving thermal stress from the heterogeneous contraction. Crystallization occurs in the glass melt during solidification, demonstrating the heterogeneous nucleation at substrate surface and the orientational growth of nuclei due to the directional heat conduction. The present investigation identifies laser power, travel speed and preheating as the key variables for optimisation.
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