Análise da aplicação de revestimento duro em aço carbono com o processo FCAW com e sem injeção de arame não energizado
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2023-08-17
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Universidade Federal de Goiás
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Brazil is the world’s largest producer and exporter of sugar. One of the factors that directly
impact the productivity of the sugarcane and alcohol industry is the maintenance of many
equipment pieces that are subject to wear mechanisms. The application of hardfacing aims to
reduce the wear of these equipment pieces and, consequently, increase their lifespan, reduce
downtime, and production costs. To ensure the quality of the hardfacing, a proper selection of
the deposited material and process parameters must be made. The objective of this study is to
evaluate the resistance to abrasive wear of hardfacings using the FCAW (Flux-Cored Arc
Welding) process, both self-shielded and with the addition of non-energized wire, while also
assessing two interpass temperatures between weld beads (50°C and 200°C). The goal is to
improve wear resistance and reduce the occurrence of solidification cracks. Three types of
consumables (FeCrC, FeCrC+Nb, and FeCrC+Ti) with a diameter of 1.6 mm were used. FeCrC
was used for the energized wire, while FeCrC+Nb and FeCrC+Ti were used for the non-energized
wire. The base metal used was SAE 1045. Test specimens were constructed for wear evaluation
in the laboratory using a Rubber Wheel Abrasion Tester in accordance with ASTM G65-91
standard. Wear evaluation was performed based on mass loss. Hardness and microstructure
analyses of the coatings were also carried out. The best results for resistance to abrasive wear
were obtained with the combination of FeCrC and FeCrC+Ti (nonenergized wire). It showed
better performance at both interpass temperatures compared to other wire combinations. In all
combinations, the presence of M7C3 carbides was observed. The combination of FeCrC and
FeCrC+Ti showed the presence of titanium carbides (TiC), while the combination of FeCrC andFeCrC+Nb exhibited niobium carbides (NbC). All combinations with an interpass temperature of
200°C demonstrated higher wear resistance compared to those with an interpass temperature
of 50°C.
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MARQUES, V. F. O. Análise da aplicação de revestimento duro em aço carbono com o processo FCAW com e sem injeção de arame não energizado. 2023. 89 f. Dissertação (Mestrado em Engenharia Mecânica) - Escola de Engenharia Elétrica, Mecânica e de Computação, Universidade Federal de Goiás, Goiânia, 2023.