Title: Laser controlled melting of Haynes 188 alloy: surface with presence of TiC particles

Authors: B.J. Abdul Aleem; M.S.J. Hashmi; B.S. Yilbas

Addresses: School of Mechanical and Manufacturing Engineering, DCU, Dublin, Ireland; ME Department, KFUPM, Dhahran 31261, Saudi Arabia. ' School of Mechanical and Manufacturing Engineering, DCU, Dublin, Ireland. ' ME Department, KFUPM, Dhahran 31261, Saudi Arabia

Abstract: Laser controlled melting of pre-prepared Haynes 188 alloy surface is carried out. A carbon film containing titanium carbide particles is formed at the workpiece surface prior to the laser treatment process. The metallurgical changes in the treated layer are examined, and the residual stresses formed at the treated surface are measured using the X-ray diffraction technique. It is found that laser treated surface is free from microcracks and surface asperities. The formation of carbonitride and nitride phases at the surface vicinity of the laser treated layer contributes to increasing hardness and dense layer formation at the surface. The residual stress formed at the surface is on the order of 590

Keywords: laser melting; Haynes 188 alloy; alloy surfaces; titanium carbide; TiC particles; residual stress; laser treatement; microcracks; hardness; dense layer formation; surface roughness.

DOI: 10.1504/IJSURFSE.2011.044396

International Journal of Surface Science and Engineering, 2011 Vol.5 No.5/6, pp.446 - 456

Received: 26 Apr 2011
Accepted: 30 Jun 2011

Published online: 24 Dec 2011 *

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