Title: Laser treatment of alumina surfaces: the first and the second law analysis

Authors: Bekir S. Yilbas, Ahmet Z. Sahin, Ahmet Z. Sahin, S. Akhtar

Addresses: Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia. ' Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia. ' Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia. ' Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

Abstract: The first and second law efficiencies of laser treatment of alumina surface are examined in line with the same laser scanning speeds and the laser power levels used in the experiments. Temperature and stress fields developed in the laser treated region are predicted for two laser power levels using ABAQUS code. The microstructural changes in the laser treated region are investigated using SEM and XRD. It is found that the first and second law efficiencies are reduced with increasing laser output power. Von Mises stress attains high values at high laser power settings; which is more pronounced at high laser scanning speeds.

Keywords: laser surface treatment; alumina surfaces; first law efficiency; second law efficiency; thermal stress; temperature; laser scanning speeds; laser power levels; microstructure.

DOI: 10.1504/IJSURFSE.2011.041397

International Journal of Surface Science and Engineering, 2011 Vol.5 No.2/3, pp.116 - 130

Available online: 21 Jul 2011 *

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