Efeito do Nióbio na Microestrutura e nas Propriedades Mecânicas do Aço Inoxidável Superduplex Fundido SEW 410 W.Nr. 1.4517

Rossitti, Sérgio Mazzer

doi:10.11606/t.88.2000.tde-26102005-142234

Cited by 4 publications

(4 citation statements)

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“…As this method can result in unexpected alloy chemical composition, it becomes necessary to include some elements in the material, according to standards, to adjust the phase composition. 13 The microstructure of the produced materials was investigated by immersion in Beraha's chemical reagent and observed using a LEICA light microscope equipped with an image analysis system that allowed assessment of the grain size, distribution and percentage of the phases. The presence of magnetic phases was determined by using the Fischer magnetic method (Fischer Ferritoscope with 0.1% detection limit).…”

Section: Methodsmentioning

confidence: 99%

Influence of Ferrite Phase Content on the Electrochemical Properties of Duplex Stainless Steels

Souza

Rossitti²,

Fortulan

et al. 2016

Mat. Res.

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Duplex stainless steels have a large number of industrial applications and may replace high cost materials, especially in chloride-containing environments like seawater in off-shore platforms due to their high mechanical properties and good corrosion resistance. The influence of the ferrite content on the performance of duplex stainless steels in these corrosive environments is not well known. For the present paper, new superduplex stainless steels with ferrite between 30 and 60% were developed and their microstructure and corrosion resistance were evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests in NaCl 3.5% (wt %) at 26°C and 78°C. The results obtained at 26°C showed that the pitting potential (E pitt ) is little affected by the ferrite content, but for the materials with higher ferrite it was possible to observe an increase in the repassivation potential with a decrease in the corrosion potential and passive currents due to the presence of more resistive passive films. Tests performed at 78°C indicated a high decrease in the E pitt for all the samples, independently of the ferrite percentage, although maintaining superiority in higher ferrite content. Alloys with a 55% ferrite phase content, i.e. less dependent of Ni element, present a superior performance of corrosion resistance.

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Section: Methodsmentioning

confidence: 99%

Influence of Ferrite Phase Content on the Electrochemical Properties of Duplex Stainless Steels

Souza

Rossitti²,

Fortulan

et al. 2016

Mat. Res.

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show abstract

“…Os aços inoxidáveis austeno-ferríticos, ou duplex, estão sendo utilizados em substituição aos inoxidáveis austeníticos em diversas aplicações, tais como a indústria química, petroquímica e geração de energia. Nas plataformas fixas e flutuantes que operam em profundidades de 2000 m abaixo do nível do mar e em componentes fundidos como as bombas que injetam água salgada no subsolo marítimo, a resistência à corrosão e mecânica são importantes [1,2]. De uma forma geral, esses aços apresentam ilhas de austenita em uma matriz ferrítica, com frações volumétricas dependentes da composição química e do tratamento térmico.…”

Section: Introductionunclassified

Avaliação Da Fase Sigma E De Laves Em Um Aço Inoxidável Austeno-Ferrítico Modificado Com Nióbio Por Meio Do Software Factsage

Itman Filho,

Cirilo,

Santo

et al. 2023

ABM Proceedings

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“…According to the literature, niobium has a great influence on phases transformation of austenitic-ferritic stainless steels, besides promoting grain refinement in the microstructure 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steel

et al. 2014

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Austenitic-ferritic stainless steels containing 0.2% and 0.5% niobium were evaluated with respect to the microstructures, microhardness, pitting potential resistance, electrochemical impedance and wearing tests. Niobium is an alphagenic element and has a great influence on phase transformation of duplex stainless steels. In the present investigation, the samples were annealed at 1050 °C and aged at 850 °C to promote the formation of sigma phase. The pitting potential resistance and electrochemical impedance were evaluated in 3.5 % sodium chloride solution. The wear coefficients were calculated by micro-wear tests conducted using a fixed ball machine and aluminum oxide as abrasive. The results show that the niobium content lead to increase on Laves phase formation. This phase, in association with the sigma phase, causes a significant increase in the hardness and wear resistance with a decrease on corrosion resistance of the austenitic-ferritic stainless steels.

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Efeito do Nióbio na Microestrutura e nas Propriedades Mecânicas do Aço Inoxidável Superduplex Fundido SEW 410 W.Nr. 1.4517

Abstract: parte dos requisitos para a obtenção do título de Doutor em Ciência e Engenharia de Materiais.

Cited by 4 publications

References 0 publications

Influence of Ferrite Phase Content on the Electrochemical Properties of Duplex Stainless Steels

Influence of Ferrite Phase Content on the Electrochemical Properties of Duplex Stainless Steels

Avaliação Da Fase Sigma E De Laves Em Um Aço Inoxidável Austeno-Ferrítico Modificado Com Nióbio Por Meio Do Software Factsage

Effect of niobium in the phase transformation and corrosion resistance of one austenitic-ferritic stainless steel

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