Title: Numerical and experimental analysis of rapidly solidified laser remelted Al 5wt pct Ni surfaces

Authors: Noe Cheung, Kleber A.S. Cruz, Manuel V. Cante, Jose E. Spinelli, Maria Clara F. Ierardi, Amauri Garcia

Addresses: Federal Institute of Education, Science and Technology of Sao Paulo – IFSP, Campus Sao Joao da Boa Vista, Acesso Dr. Joao Batista Merlin, s/n – Jardim Italia, 13872-551 – Sao Joao da Boa Vista, SP, Brazil. ' IM2NP, University Paul Cezanne, Aix-Marseille III, 13397 Marseille Cedex 20, France. ' Department of Materials Engineering, State University of Campinas – UNICAMP, P.O. Box 6122 – 13083-970 – Campinas, SP, Brazil. ' Department of Materials Engineering, Federal University of Sao Carlos – UFSCar, Washington Luis Rd at Km 235, 13565-905, Sao Carlos, SP, Brazil. ' Department of Materials Engineering, State University of Campinas – UNICAMP, P.O. Box 6122 – 13083-970 – Campinas, SP, Brazil. ' Department of Materials Engineering, State University of Campinas – UNICAMP, P.O. Box 6122 – 13083-970 – Campinas, SP, Brazil

Abstract: The aim of this work was to develop a heat transfer mathematical model based on the finite difference method in order to simulate temperature fields in the laser surface remelting process. Convective heat transfer in the remelted pool was taken into account by using the effective thermal conductivity approach. Theoretical predictions furnished by previous models from the literature were used for validation of numerical simulations performed with the proposed model. Experiments of laser surface remelting of Al-5 wt pct Ni samples were carried out in the present investigation, and numerical simulations were applied for the laser machine operating parameters. The work also encompasses an analysis of microstructural and microhardness variations throughout the resulting treated and untreated zones.

Keywords: laser surface remelting; Al-Ni alloys; aluminium; nickel; mathematical modelling; numerical simulation; convective heat transfer; microstructure; microhardness; finite difference method.

DOI: 10.1504/IJMMP.2010.035939

International Journal of Microstructure and Materials Properties, 2010 Vol.5 No.2/3, pp.193 - 208

Available online: 10 Oct 2010 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article