Caracterização microestrutural de camadas de boretos formadas sobre Aço AISI 8640
DOI:
https://doi.org/10.34117/bjdv9n1-402Keywords:
boretação, Aço AISI 8640, microestrutura, propriedades mecânicas, aderênciaAbstract
O aço AISI 8640 é um dos de médio carbono e baixa liga mais utilizados industrialmente. Neste trabalho, o tratamento termoquímico de boretação por via sólida foi realizado em substratos de aço AISI 8640 com o objetivo de aumentar a dureza da superfície. Os tratamentos foram realizados a 1000 °C durante 1, 2 e 4 horas. A microestrutura e as propriedades mecânicas foram avaliadas por Difração de Raios-X, Microscopia Eletrônica de Varredura, Microscopia Confocal, Microdureza Vickers e indentações Rockwell C. Camadas monofásicas de Fe2B foram obtidas para todas as condições experimentais. As maiores espessura e dureza encontradas foram 144,4 ± 0,7 µm e 1400 HV0,05, respectivamente. Após os tratamentos, houve aumento considerável da rugosidade devido à formação da camada de boretos. A aderência entre a camada de boretos e o substrato é favorecida pela formação de uma camada monofásica de boretos composta exclusivamente por Fe2B. Os resultados obtidos sugerem uma boa resposta do aço AISI 8640 ao tratamento de boretação, possibilitando sua utilização quando se busca aumento de dureza e resistência ao desgaste.
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