Numerical Simulation And Microstructural Investigation Of An Aluminum-copper Alloy Processed By Laser Surface Remelting

The aim of this work is to develop a mathematical model based on the finite difference method in order to simulate the remelting process. Good agreement between numerical and experimental results was obtained in the delimitation of the remelted zone. The work also concerns the analysis of the microstructural and hardness variations throughout samples of an aluminum-copper alloys (Al-15 wt pet Cu) submitted to a laser surface remelting treatment. The specimens were examined by optical and scanning electron microscopy. Microhardness measurements were carried out on the transverse section for the resolidified and unmolten regions.7155164Damborenea, J., Surface modification of metals by high power lasers (1998) Surface and Coatings Technology, 100-101, pp. 377-382Ion, J.C., Shercliff, H.R., Ashby, M.F., Diagrams for laser materials processing (1992) Acta Metallurgien et Materialia, 40 (7), pp. 1539-1551Monson, P.J.E., Steen, W.M., Comparison of laser hardfacing with conventional processes (1990) Surface Engineering, 6 (3), pp. 185-193Kurz, W., Fisher, D.J., (1992) Fundamentals of Solidification, , Trans Tech Publications, SwitzerlandDeMol van Otterloo, J.L., Bagnoli, D., De Hosson, J.TH.M., Enhanced mechanical properties of laser treated Al-Cu alloys: A microstructural analysis (1995) Acta Metallurgica, 43 (1), pp. 2649-2656Hoadley, A.F.A., Rappaz, M.A., Thermal model of laser cladding by powder injection (1992) Metallurgical Transactions B, 23, pp. 631-642Riabkina-Fushman, M., Zahavi, J., Laser alloying and cladding for improving surface properties (1996) Applied Surface Science, 106, pp. 263-267Watkins, K.G., McMahon, M.A., Steen, W.M., Microstructure and corrosion properties of laser processed aluminum alloys: A review (1997) Materials Science and Engineering A, 231, pp. 55-61Munitz, A., Microstructure of rapidly solidified laser-molten Al-4,5 Wt Pct Cu surfaces (1985) Metallurgical Transactions B, 16, pp. 149-161Zimmermann, M., Carrard, M., Kurz, W., Rapid solidification of Al-Cu eutetic alloy by laser remelting (1989) Acta Metallurgica, 37 (12), pp. 3305-3313Cheung, N., Ierardi, M.C.F., Garcia, A., Vilar, R., The use of artificial intelligence for the optimization of a laser transformation hardening process (2000) Lasers in Engineering, 10, pp. 275-291Osório, W.R.R., Garcia, A., Microstructure and mechanical properties of Zn-Al alloys as a function of solidification conditions (2002) Materials Science and Engineering A, 325, pp. 104-112Quaresma, J.M., Santos, C.A., Garcia, A., Correlation between unsteady-state solidification conditions, dendrite spacings, and mechanical properties of Al-Cu alloys (2000) Metallurgical and Materials Transactions A, 31, pp. 3167-3178Siqueira, C., Cheung, N., Garcia, A., Solidification thermal parameters affecting the columnar to equiaxed transition (2002) Metallurgical and Materials Transactions A, 33, pp. 2108-2118Callister Jr., W.D., (1994) Materials Science and Engineering - An Introduction, , John Wiley &ampSons, 3rd EditionIncropera, F.P., Dewitt, D.P., (1990) Fundamentals of Heat and Mass Transfer, , John Wiley & Sons: New YorkRuddle, R.W., (1957) The Solidification of Castings. 2. Ed., , Institute of Metals, Series No. 7Gill, S.C., Zimmermann, M., Kurz, W., Laser resolidification of the Al-Al2Cu eutetic the coupled zone (1992) Acta Metallurgica et Materialia, 40 (11), pp. 2895-290