Abstract
A plasma-sprayed Ni-WC layer was deposited on an Al-Si cast alloy surface, and then it was further melted by a 5 kW CO2 laser. The microstructure and chemical composition of the laser-melted zone were investigated, and the microhardness in different parts was measured. Experimental results showed that the chemical composition of the sample was not uniform. Compositional segregation in the laser-melted zone was found. Some amorphous structure appeared in the nickel-rich locations after laser melting. Owing to the thermal effect of the laser scanning, an intermediate-phase Ni3Al segregated from this region and formed Ni3Al grains and amorphous grains. Some WC particles melted in the matrix, and chromium carbide Cr2;|C6 and (Cr,W)C separated during the cooling process. The highest microhardness (1027HV) was found in the high-nickel region.
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References
M. Boas, M. Bamberger, and G. Revez, Laser-Allo ying a Plasma-Sprayed WC/Co Layer to Enhance Wear Properties, Sur- face and Coating Technology, Vol 42, 1990, p 175–186
M.G. Pujar, R.K. Dayal, and R.K. Singh Raman, Microstructural and Aqueous Corrosion Aspects of Laser-Surface-Melted type 304ss Plasma-Coated Mild Steel, Journal of Materials Engineer- ing and Performance, Vol3, 1994,p412–418
J. de Damborenea, V. Lopez, and A.J. Vazpuez, Improving High- Temperature Oxidation of Incoloy 800H by Laser Cladding, Sur- face and Coating Technology, Vol 70, 1995, p 107–113
D. Pantellis, E. Giannetaki, Y. Chryssoulakis, and P. Ponthi- aux, Laser Surface Treatment of Aluminum Alloy 6061 with SiC Powder Injection, Plating and Surface Finishing, Vol 81. 1994, p 52–56
W.J. Tomlinson and A.S. Bransden, Cavitation Erosion of La- ser Surface Alloyed Coatings on Al-12%Si, Wear, Vol 185, 1995, p 59–65
A. Almeida, M. Anjos, R. Vilar, R. Li, G.S. Ferreira, W.M. Steen, and K.G. Watkins, Laser Alloying of Aluminium Alloys with Chromium, Surface and Coating Technology, Vol 70, 1995, p 221–229
T.B. Massalski, Binary Alloy Phase Diagrams, American Soci- ety for Metals, 1986, p. 142.
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Liang, G.Y., Wong, T.T. Investigation of microstructure of laser cladding Ni-WC layer on Al-Si alloy. J. of Materi Eng and Perform 6, 41–45 (1997). https://doi.org/10.1007/s11665-997-0030-3
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DOI: https://doi.org/10.1007/s11665-997-0030-3