Análise da aplicação de revestimento duro em aço carbono com o processo FCAW com e sem injeção de arame não energizado

• Ano de defesa: 2023
• Autor(a) principal: Marques, Vitória Ferreira de Oliveira
• Orientador(a): Ferraresi, Valtair Antonio
• Banca de defesa: Ferraresi, Valtair Antonio, Souza, Daniel, Lima, Aldemi Coelho, Contin, Andre
• 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: Revestimento duro; Desgaste abrasivo; FCAW; Arame não-energizado
• Palavras-chave em Inglês: Hardfacing; Abrasive wear; Non-energized wire
• Área do conhecimento CNPq: ENGENHARIAS::ENGENHARIA MECANICA::FENOMENOS DE TRANSPORTE
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/13132

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.