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Cavitation erosion and corrosion behaviors of stainless steel 316 laser surface-alloyed with WC
K. H. Lo1; F. T. Cheng1; H. C. Manb2; C. T. Kwok3
2002-12-01
Conference NameICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics
Source PublicationICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics, Congress Proceedings
Conference Date14-17 October 2002
Conference PlaceScottsdale, AZ
Abstract

Fine WC powder was preplaced on stainless steel 316 by pasting and processed with a high power CW Nd-YAG laser to achieve surface alloying. The composition and micro structure of the alloyed layer and the phases formed were investigated by EDS, SEM, and XRD respectively. The cavitation erosion and corrosion behaviors of the alloyed samples in 3.5% NaCl solution were studied by vibratory cavitation erosion test and potentiodynamic polarization test. Under favorable processing conditions, the cavitation erosion resistance of the alloyed sample could reach more than 30 times that of the as-received 316. On the other hand, the corrosion resistance in general deteriorated. The improvement in cavitation erosion resistance could be attributed to the increase of W in solid solution and to the precipitation of fine carbides, both resulting from the dissolution of the fine WC powder during laser processing. The decrease in corrosion resistance originated from the weakening of the passive film because some Cr precipitated out from solid solution to form metal carbides.

DOIhttps://doi.org/10.2351/1.5065768
URLView the original
Indexed By其他
Language英语
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Document TypeConference paper
CollectionDEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Affiliation1.Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
2.Department Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
3.Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau, P.O. Box 3001, Taipa, Macau, China
Recommended Citation
GB/T 7714
K. H. Lo,F. T. Cheng,H. C. Manb,et al. Cavitation erosion and corrosion behaviors of stainless steel 316 laser surface-alloyed with WC[C],2002.
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