Efeito do gás de proteção e de tratamento térmico no desgaste de revestimentos de inconel realizados pelo processo GMAW

• Ano de defesa: 2023
• Autor(a) principal: Kihara, Eliane Alves
• Orientador(a): Ferreira Filho, Demóstenes
• Banca de defesa: Ferreira Filho, Demóstenes, Souza, Daniel, Murray, Henara Lillian Costa, Alano, José Henrique
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Engenharia Mecânica
• Departamento: Escola de Engenharia Elétrica, Mecânica e de Computação - EMC (RMG)
• País: Brasil
• Palavras-chave em Português: Inconel 625; Desgaste; GMAW; Tratamento térmico; Revestimento
• Palavras-chave em Inglês: Grinding; Heat treatment; Coating
• Área do conhecimento CNPq: ENGENHARIAS::ENGENHARIA MECANICA::PROJETOS DE MAQUINAS
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/13006

In coastal and offshore installations, deterioration of materials due to corrosion can reduce reliability and increase the cost of maintaining engineered components. However, it is known that the surface properties of materials can be improved by applying protective coatings on the substrate, thus prolonging the useful life of engineering components in severe environments, it is worth mentioning the best costeffectiveness when performed with more noble materials, maintaining the body of the part in lower cost material, and providing sur-faces with desired properties at a more accessible cost. A nickel alloy commonly used in the coating process is Inconel 625, because, subjected to severe conditions, it has excellent mechanical properties and resistance to corrosion at elevated temperatures. Among the various coating techniques, arc welding processes are suitable methods due to their good deposition rate and reliability, but they limit the application with inert shielding gases. Thus, this work aims to evaluate the effect of shielding gas and heat treatment on the wear of coatings of Inconel 625 deposited by the GMAW process on a carbon steel surface with the intention of selecting the parameters that will provide better mechanical properties for applications in harsh environments providing improvements in maintenance and manufacturing costs. Coatings were carried out on A36 carbon steel plate with two mixtures of shielding gases (Ar + 25%CO2 and Ar +25%He), analysis was carried out on samples as welded and after heat treatment (heating for 1 h at 1000 °C and air cooling). To evaluate the coatings, Vickers hardness tests (HV), scanning electron microscopy (SEM), energy dispersion spectrometer (EDS), wavelength dispersion spectrometry (WDS), confocal wear tests by the alternating sliding method were performed. between the flat surface and the spherical counter in saline solution (10% iodized salt). The samples that used He gas showed a higher wear rate compared to the samples that used CO2 gas, this result is attributed to the formation of Laves phase and surface embrittlement. As for the heat treatment in both gases, there was a reduction in segregation and a tendency to reduce the surface hardness and reduce the wear rate.