Laser alloying of aluminum alloy AA 6061 with Ni and Cr. Part 1. Optimization of processing parameters by X-ray imaging

Fu, Yong Qing, Batchelor, Andrew, Gu, Yan-wei, Khor, Khiam Aik and Xing, Huting (1998) Laser alloying of aluminum alloy AA 6061 with Ni and Cr. Part 1. Optimization of processing parameters by X-ray imaging. Surface and Coatings Technology, 99 (3). pp. 287-294. ISSN 0257-8972

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Abstract

Laser alloying of aluminum alloy with Ni and Cr in order to prevent the formation of cracking was studied and a new nondestructive inspection technique. X-ray imaging, was applied to optimize the laser parameters. The effects of laser parameters on microstructure, microhardness and defects of the coating were evaluated. The results showed that the number and size of cracks and pores in the coatings increased with laser power and overlapping ratio. For a given laser power, there existed an optimum travel speed at which there were little defects in the coating. The hardness of the coating was 5–6 times that of the original substrate. Maximum hardness was found at a low laser power since higher powers led to dilution of the hard phases by aluminum from the substrate. By using X-ray imaging and SEM, the optimum process parameters were found which enable a smooth surface without any cracks and pores to be obtained.

Item Type: Article
Uncontrolled Keywords: Laser alloying; Aluminum alloy; X-ray imaging; Cracking; Pores; Laser parameters
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 27 Mar 2015 11:18
Last Modified: 24 Oct 2017 08:55
URI: http://nrl.northumbria.ac.uk/id/eprint/21896

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