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Caracterização não destrutiva de microcanais produzidos por Friction Stir Channeling
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O Friction Stir Channeling (FSC) é uma tecnologia recente e inovadora de processamento
no estado sólido que permite a abertura de canais internos contínuos em componentes
monolíticos, podendo ser utilizado na indústria dos moldes e dos permutadores de calor.
O foco desta dissertação consiste na caracterização não destrutiva de canais de reduzidas
dimensões. Pretende-se, com diferentes técnicas de Ensaios Não Destrutivos (END) identificar
a presença dos microcanais, a sua regularidade ao longo da secção, e também a sua localização,
dimensão e trajetória.
As cinco técnicas de END utilizadas são a radiologia digital, as correntes induzidas, os
ultra-sons, a termografia e os líquidos penetrantes. Estas técnicas foram aplicadas a provetes
com microcanais lineares e curvilíneos. Os provetes foram produzidos através de pinos com
diâmetros de 2, 1 e 0.5 mm, com comprimentos de 2.25, 1.05 e 0.53 mm, respetivamente.
A radiologia digital e os ultra-sons mostraram-se eficazes na caracterização dos canais
de todas as dimensões referidas. As correntes induzidas não permitiram afirmar a presença
exclusiva dos canais em nenhuma dimensão. A termografia indicou a presença do canal
curvilíneo de 1.5 mm com injeção de fluído. Os líquidos penetrantes permitiram afirmar a não
abertura do canal à superficie.
Friction Stir Channeling (FSC) is a recent and innovative solid state processing technology that allows the opening of continuous internal channels in monolithic components and can be used in the mold and heat exchanger industries. The focus of this dissertation is on the nondestructive characterization of small channels. It is intended, with different Non Destructive Testing (NDT) techniques, to identify the presence of microchannels, their regularity along the section, and also their location, size and trajectory. The five NDT techniques used are digital radiology, eddy currents, ultrasound, thermography and liquid penetrant. These techniques were applied to specimens with linear and curvilinear microchannels. The specimens were produced using pins with diameters of 2, 1 and 0.5 mm, with lengths of 2.25, 1.05 and 0.53 mm, respectively. Digital radiology and ultrasound were effective in detecting canals of all dimensions. Eddy currents were not able to confirm the exclusive presence of canals in any dimension. Thermography indicated the presence of a 1.5 mm curvilinear canal with fluid injection. The penetrating liquids allowed us to confirm the non-opening of the channel at the surface.
Friction Stir Channeling (FSC) is a recent and innovative solid state processing technology that allows the opening of continuous internal channels in monolithic components and can be used in the mold and heat exchanger industries. The focus of this dissertation is on the nondestructive characterization of small channels. It is intended, with different Non Destructive Testing (NDT) techniques, to identify the presence of microchannels, their regularity along the section, and also their location, size and trajectory. The five NDT techniques used are digital radiology, eddy currents, ultrasound, thermography and liquid penetrant. These techniques were applied to specimens with linear and curvilinear microchannels. The specimens were produced using pins with diameters of 2, 1 and 0.5 mm, with lengths of 2.25, 1.05 and 0.53 mm, respectively. Digital radiology and ultrasound were effective in detecting canals of all dimensions. Eddy currents were not able to confirm the exclusive presence of canals in any dimension. Thermography indicated the presence of a 1.5 mm curvilinear canal with fluid injection. The penetrating liquids allowed us to confirm the non-opening of the channel at the surface.
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Palavras-chave
Abertura de canais por fricção linear Canais Microcanais Ensaios Não Destrutivos (END) Caracterização