Efeito do gás de proteção e de tratamento térmico no desgaste de revestimentos de inconel realizados pelo processo GMAW
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Data
2023-01-28
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Universidade Federal de Goiás
Resumo
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.
Descrição
Palavras-chave
Inconel 625 , Desgaste , GMAW , Tratamento térmico , Revestimento , Grinding , Heat treatment , Coating
Citação
KIHARA, E. A. Efeito do gás de proteção e de tratamento térmico no desgaste de revestimentos de inconel realizados pelo processo GMAW. 2023. 150 f. Dissertação (Mestrado em Engenharia Mecânica) - Universidade Federal de Goiás, Goiânia, 2023.