TiC/Ti Composite Layers Fabricated by Laser Surface Alloying

Abstract:

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Laser surface alloying is an attractive processing to improve surface hardness, wear and corrosion resistance. In this paper, a continuous wave CO2 laser was used to irradiate commercially pure titanium surface with pre-placed active carbon powders in argon atmosphere. A compact, well-adherent, and crack-free TiC/Ti composite layer was obtained. The microstructure and phase constitution of the alloyed layers were determined and analyzed, and the micro-hardness was measured. The result of X ray diffraction (XRD) analysis shows that the alloyed layers contain TiC and Ti (martensite). The scanning electron microscopy (SEM) observation shows TiC growth morphologies have a well-developed dendrite, cellular dendrite, globular microstructure and cross-petal microstructure. The mechanism of the formation of titanium carbides is discussed. Micro-hardness of the laser surface alloyed layer was improved to 420 Hv as compared to 200 Hv of the as-received commercially pure titanium.

Info:

Periodical:

Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong

Pages:

1148-1150

DOI:

10.4028/www.scientific.net/KEM.336-338.1148

Citation:

J. B. Zhang et al., "TiC/Ti Composite Layers Fabricated by Laser Surface Alloying", Key Engineering Materials, Vols. 336-338, pp. 1148-1150, 2007

Online since:

April 2007

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Price:

$35.00

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