Efeito da temperatura e do tempo de tratamento térmico de envelhecimento na microestrutura e resistência à corrosão do aço inoxidável duplex UNS S31803

Autores

DOI:

https://doi.org/10.33448/rsd-v10i8.17369

Palavras-chave:

Aço inoxidável duplex; Corrosão; Transformação de fases; Envelhecimento.

Resumo

Aços inoxidáveis duplex (AID) correspondem à uma classe de aço em que a microestrutura é composta basicamente pelas fases ferrita e austenita. E devido ao caráter metaestável da ferrita, transformações de fases associadas podem ocorrer durante tratamentos térmicos como alfa linha e sigma, as quais podem levar a diminuição da resistência à corrosão. Dessa forma, o objetivo deste trabalho foi avaliar a influência dos tratamentos térmicos de solubilização a 1100°C por 30min e envelhecimento a 500 e 600°C por 1, 3 e 12h, na microestrutura e na resistência à corrosão do AID UNS S31803. Os aços foram caracterizados por MEV, EDS, DRX, dureza, microdureza e análise térmica, e observou-se que os aços tratados termicamente por envelhecimento apresentaram fração volumétrica de ferrita menor que do aço solubilizado. E os aços envelhecidos a 500°C por 1h apresentaram a fase alfa linha dispersa na ferrita e os aços envelhecidos a 600°C por 12h, apresentaram as fases alfa linha, sigma e chi. Nos ensaios reativação potenciodinâmico duplo ciclo em solução de 0.5M H2SO4 e 0.01M KSNC, observou-se que não ocorreu a sensitização. E nos ensaios de polarização potenciodinâmica cíclica, em solução 3.5% NaCl, verificou-se que a precipitação da fase alfa linha não alterou a resistência à corrosão, porém a fase sigma reduziu a resistência à corrosão.

Biografia do Autor

Isabela Dainezi, Federal University of São Carlos

Postgraduate Program in Materials Science and Engineering at the Federal University of São Carlos - PPGCEM/UFSCar, Rod. Washington Luís, km 235, São Carlos, 13565-905, SP, Brazil

Spyridion Haritos Borges, Federal University of Alfenas

Postgraduate Program in Materials Science and Engineering at the Federal University of Alfenas - UNIFAL - Rod. José Aurélio Vilela, BR 267-Km 533, Cidade Universitária, Poços de Caldas, 377015-400, MG, Brazil.

Luciola Lucena de Sousa, Federal University of Alfenas

Postgraduate Program in Materials Science and Engineering at the Federal University of Alfenas - UNIFAL - Rod. José Aurélio Vilela, BR 267-Km 533, Cidade Universitária, Poços de Caldas, 377015-400, MG, Brazil.

Neide Aparecida Mariano, Federal University of Alfenas

Postgraduate Program in Materials Science and Engineering at the Federal University of Alfenas - UNIFAL - Rod. José Aurélio Vilela, BR 267-Km 533, Cidade Universitária, Poços de Caldas, 377015-400, MG, Brazil.

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Publicado

11/07/2021

Como Citar

DAINEZI, I.; BORGES, S. H.; SOUSA, L. L. de; MARIANO, N. A. Efeito da temperatura e do tempo de tratamento térmico de envelhecimento na microestrutura e resistência à corrosão do aço inoxidável duplex UNS S31803. Research, Society and Development, [S. l.], v. 10, n. 8, p. e24910817369, 2021. DOI: 10.33448/rsd-v10i8.17369. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/17369. Acesso em: 23 nov. 2024.

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