Experimental Study on Residual Stresses of Al2O3 Coating by Laser Re-Melting

Abstract:

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The surface of Al2O3 coating sprayed on 40Cr substrate was re-melted with high power continuous CO2 laser, and its micro-hardness and residual stresses were measured, respectively. The strengthening mechanism of Al2O3 coating by laser re-melting was analyzed and discussed. The experimental results shown that the surface of Al2O3 coating by laser re-melting is neat and smooth, and its compositions are even, its structures are compact, and Al2O3 coating is evenly distributed in its surface with grain forms, and its micro-hardness increases about 200%; Residual stress of Al2O3 coating by laser re-melting is changed into compressive stress from tensile stress, which is benefit to improving bonding strength of coating-substrate interface.

Info:

Periodical:

Key Engineering Materials (Volumes 431-432)

Edited by:

Yingxue Yao, Dunwen Zuo and Xipeng Xu

Pages:

446-449

DOI:

10.4028/www.scientific.net/KEM.431-432.446

Citation:

D. J. Kong et al., "Experimental Study on Residual Stresses of Al2O3 Coating by Laser Re-Melting", Key Engineering Materials, Vols. 431-432, pp. 446-449, 2010

Online since:

March 2010

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Price:

$35.00

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