EFEITO DO TRATAMENTO TÉRMICO NAS PROPRIEDADES MAGNÉTICAS E NA CORROSÃO LOCALIZADA DO AÇO INOXIDÁVEL DUPLEX UNS 31803

• Ano de defesa: 2021
• Autor(a) principal: Almeida, Elton Mesquita de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Engenharia Mecânica; Centro Tecnológico; UFES; Programa de Pós-Graduação em Engenharia Mecânica
• Palavras-chave em Português: Aço Inoxidável Duplex; DL-EPR; Ruído Magnético de Barkhausen; Tratamento Térmico; Ferrita; subject.br-rjbn; Engenharia Mecânica
• Link de acesso: http://repositorio.ufes.br/handle/10/15022

This study evaluated duplex stainless steel UNS 31803 degradation by DL-EPR test and magnetic properties measurement of material. For these the samples were heat treated at 800C for 10, 120 and 240 minutes beside the sample under the condition as received. These treated resulted in the precipitation of deleterious phases and paramagnetic phases. DL-EPR test had been made in 2M H2SO4 + 1M HCL solution using sweep rate 1,67 mV/s for the purpose quantify sensitization degree. Had been made measurement of Barkhausen magnetic noise, noise RMS, Peak, Remanence, Coercivity, Magnetic flux density in the saturation, and besides that had been got magnetic hysteresis curve of material for each condition to explore the equipament used and observe the magnetic changes cause material degradation due heat treated. The material suffered a considerable change in the propotion ferrite-austenite due heat treated. Thus DL-EPR resuts was able measure sensitization degree in each condition, besides that, the Barkhausen magnetic noise, RMS, remanence and magnetic flux density showed good correlations with change of ferrite volumetric percentage showing promising analyzes in the study material degradation.