Caracterização microestrutural da camada de NiCrAlY sobre Ti-6Al-4V processado por laser de Yb:fibra
Microstructural characterization of NiCrAlY layer on Ti-6Al-4V processed by Yb-fiber laser
Renata Jesuina Takahashi, João Marcos Kruszynski de Assis, Rudimar Riva, Aline Capella de Oliveira, Danieli Aparecida Pereira Reis
Resumo
O processamento de materiais com laser é uma alternativa para formação de camadas densas e livres de porosidades, como exige a aplicação da camada metálica em TBC (Thermal Barrier Coating). O TBC é um sistema de camadas de materiais que promove proteção térmica e contra oxidação e corrosão em ligas metálicas, como a liga de titânio (grau 5). Este trabalho tem por objetivo o estudo da microestrutura formada entre a camada metálica de NiCrAlY e a liga Ti-6Al-4V por processamento com laser de Yb:fibra. A camada metálica foi pré depositada na forma de pó e submetida ao laser, cujos parâmetros de velocidade de varredura do feixe variou em 25, 50 e 100 mm/s com potência de 200 W e feixe do laser focalizado com diâmetro de 0,50 mm com sobreposição de 50%, a cada trilha. A avaliação dos parâmetros de laser foi composta pela análise de microscopia eletrônica de varredura, análise de difração de raios X, análise de EDS do perfil transversal da amostra. Os resultados mostraram que houve aderência entre a camada de NiCrAlY e o substrato com baixa diluição química na interface. Com o aumento da velocidade de varredura do feixe de laser, camadas metálicas mais finas foram formadas.
Palavras-chave
Abstract
The processing of materials with laser is an alternative to form dense and porosity-free layers, as required by the metallic layer in the TBC application (Thermal Barrier Coating). TBC is a system of layers that promote protection against oxidation, corrosion and thermal protection of metal alloys, such as titanium alloy (grade 5). The aim of this work was to study the micrograph formed between the NiCrAlY metallic layer and the Ti-6Al-4V alloy by Yb-fiber laser processing. The metallic layer was pre-deposited in the powder form and submitted to the laser, whose beam scanning speed parameters were varied in 25, 50 and 100 mm/s with laser beam power of 200W with 50% of superposition for each track. The evaluation of the laser parameters was composed by scanning electron microscopy (SEM), x-ray diffraction (XRD) and energy dispersive x-ray spectroscopy (EDS) in cross-sectioned of the sample. The results showed that there was adhesion between the NiCrAlY layer and the substrate with low chemical dilution at the interface. As the scanning speed of the laser beam increased, thinner metallic layers were formed.
Keywords
Referências
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Submetido em:
20/07/2022
Aceito em:
10/11/2022
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