Simulação numerica de tratamento superficial por refusão a laser : interação radiação laser-materia e solidificação

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

In this work, a two dimensional numerical modei in cylindrical coordinates based on the finite difference technique is developed pennitting the description of the thermal field evolution during heating, fusion, solidification and cooling along the laser surface treatment processo The model predictions are compared to experimental results as well as to those fumished by other models found in literature for the surface quenching and remelting process by laser. AISI 1045 steel and Al-15% wtCu samples were used for the surface treatment by using a 1000W C02 CW laser of the Laboratório Nacional de Luz Síncrotron. For a comparative effect, the laser tracks were performed with different velocities for a fixed value of power established for each treatment type. AISI 1045 steel samples were used for studying the surface quenching and remelting process by laser and the Al-15% wtCu samples were submitted to the laser surface remelting treatment in order to simulate the process with a material of higher therma1 diffusivity than the steel. The microstructures resulting from the laser treatment are analyzed by using optical and electron scanning microscope and a very refined microstructure is observed which reflects significant hardness increase confirmed by the Vickers microhardness tests. An interaction between a knowledge base and the mathematical model is carried out by using a heuristic search of Artificial Intelligence in order to optimize operational parameters which permit to attain the highest martensite depth from the surface.

ASSUNTO(S)

metodos de simulação modelos matematicos metais fusão a laser

ACESSO AO ARTIGO

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