Abstract
In this chapter basic mechanism of laser surface modification technique has been discussed. Based on the process mechanism laser surface modification techniques are classified and discussed in brief. Specific advantages, disadvantages and applications of these processes are also explained. A brief review on laser surface modification of Aluminium substrate using different coating materials, surface modification of various engineering materials with TiC and surface modification of metallic substrate by utilizing pulse type low power laser have been presented. Finally, experimental details of TiC coating on pure Aluminium substrate using a pulsed Nd:YAG laser has been discussed. Effect of laser peak power and pulse overlapping on the Aluminium substrate by pre-placing TiC powder has been analyzed experimentally. Optical images of the cross-sectional view of the laser irradiated samples show successful formation of coating. Experimental results also show that, increase in laser peak power and pulse overlapping increases the coating thickness. High peak power results in removal of coating material but produces TiC mixed Aluminium layer at the top surface of substrate. Micro-hardness profile on the coating shows improvement in hardness up to 20 times than that of as received Aluminium substrate.
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Sahoo, C.K., Sahu, J.K., Masanta, M. (2015). Effect of Pulsed Nd:YAG Laser Parameters in Preplaced TiC Coating on Aluminium Substrate. In: Joshi, S., Dixit, U. (eds) Lasers Based Manufacturing. Topics in Mining, Metallurgy and Materials Engineering. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2352-8_8
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DOI: https://doi.org/10.1007/978-81-322-2352-8_8
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