Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19631
Title: Improvement of cavitation erosion resistance of AISI 316 stainless steel by laser surface alloying using fine WC powder
Authors: Lo, KH
Cheng, FT
Kwok, CT
Man, HC 
Keywords: AISI 316 stainless steel
Cavitation erosion
Laser surface alloying
Tungsten carbide
Issue Date: 2003
Publisher: Elsevier
Source: Surface and coatings technology, 2003, v. 165, no. 3, p. 258-267 How to cite?
Journal: Surface and coatings technology 
Abstract: Fine WC powder of approximately 1 μm size was employed as a convenient source of tungsten and carbon in the laser surface alloying of AISI 316 stainless steel for improving the cavitation erosion resistance. A slurry containing WC powder was preplaced on the substrate by pasting and processed with a high-power CW Nd:YAG laser to achieve surface alloying. The composition and microstructure of the alloyed layer and the phases formed were investigated by energy-dispersive X-ray spectroscopy, optical microscopy, scanning electron microscopy, and X-ray diffractometry, respectively. The cavitation erosion behavior of the laser surface-alloyed samples in 3.5% NaCl solution was studied with a vibratory cavitation erosion tester. The microhardness of the alloyed layer increases with the total W content in the layer. By employing proper processing parameters, an alloyed layer that is hard but not too brittle can be formed, with a cavitation erosion resistance that may reach more than 30 times that of the asreceived 316. The improvement in cavitation erosion resistance may be attributed to the increase of W in solid solution and to the precipitation of dendritic carbides, both resulting from the dissociation of the fine WC powder during laser processing.
URI: http://hdl.handle.net/10397/19631
ISSN: 0257-8972
EISSN: 1879-3347
DOI: 10.1016/S0257-8972(02)00739-9
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