Microstructure characterization of a duplex stainless steel weld by electron backscattering diffraction and orientation imaging microscopy techniques

Aguiar, Isabela Viegas; Escobar, Diana Pérez; Santos, Dagoberto Brandão; Modenesi, Paulo José

doi:10.1590/s1517-707620150001.0022

Cited by 21 publications

(17 citation statements)

References 20 publications

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“…Due to its configuration, characterized by a two‐phase structure of austenite and ferrite, duplex stainless steels (DSSs) have a favorable combination of properties of both phases, consisting of good mechanical strength, toughness, weldability, and corrosion resistance. This condition makes them attractive to numerous applications, especially in chemical, petrochemical, pulp and paper, energy, and oil and gas industries …”

Section: Introductionmentioning

confidence: 99%

Effect of Warm Rolling and Annealing on Microstructure, Texture, and Mechanical Properties of a 2205 Duplex Stainless Steel

Tavares

Rodrigues

Santos

2020

steel research int.

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The effect of warm rolling and annealing processes on the microstructure, microtexture, and mechanical properties of a 2205 duplex stainless steel is investigated in this work. To evaluate the microstructure, scanning (SEM) and transmission electron microscopy (TEM) and electron backscatter diffraction are used as the main techniques. The mechanical properties are assessed through tensile tests. A transition from a bamboo type into a pearl structure is observed as the thickness reduction increases. Furthermore, the ferrite phase presents a weakening of the α‐fiber (<011>//rolling direction, RD) and a development of γ‐fiber (<111>//normal direction, ND), whereas the austenite has a reduction in the intensity of the {110}<112> brass component and a strengthening of the {110}<001> Goss and {112}<111> copper components. Multistage work hardening behavior is observed by Jaoul–Crussard analysis, which indicates the presence of secondary deformation mechanisms during the plastic deformation of the steel. Post‐deformation SEM and TEM results reveal the formation of α′ and ε‐martensite at deformed regions. The orientation relationship that develops between γ‐ and ε‐martensite is Shoji–Nishiyama (S–N) <110>γ//<2110>ε.

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Section: Introductionmentioning

confidence: 99%

Effect of Warm Rolling and Annealing on Microstructure, Texture, and Mechanical Properties of a 2205 Duplex Stainless Steel

Tavares

Rodrigues

Santos

2020

steel research int.

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“…LDSS has the advantage of being cheaper than DSS due to the partial substitution of nickel by manganese and nitrogen. One of the most common LDSS alloys is UNS S32304, which has a nominal composition of 23% Cr, 4% Ni, and additions of Mo, N, and Mn . Among these, the alloying elements Cr, Mo and N are usually associated with the localized corrosion resistance of stainless steels.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical study of passive films formed on welded lean duplex stainless steel

Sicupira

Cardoso

Bracarense

et al. 2016

Materials & Corrosion

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Duplex stainless steel (DSS) has been considered as an excellent material of construction for applications where high corrosion resistance and high mechanical strength are required. The use of this material can minimize costs related to corrosion in different industries, for example, in the biodiesel industry. The objective of this study is to evaluate the electrochemical and electronic properties of passive films of thick welded joints of UNS S32304 lean duplex stainless steel (LDSS) fabricated by different welding processes, in acidified glycerin, a byproduct of the biodiesel industry. The electrochemical and electronic behavior of the passive films formed on UNS S32304 LDSS was evaluated using electrochemical impedance spectroscopy and Mott–Schottky measurements. The capacitance study shows that the passive films formed on welded DSS behave as n‐ and p‐type semiconductors above and below the flat band potential, respectively. Furthermore, the samples welded by the gas metal arc welding process exhibited better corrosion resistance than other welding process using the same filler metal.

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“…As frações volumétricas de austenita e de ferrita foram obtidas. O valor de fração volumétrica determinado foi muito próximo do encontrado na literatura, o valor de 57±4% para a ferrita e de 42±4% para a austenita [6]. Para a zona fundida, as frações volumétricas de austenita e de ferrita determinadas para os diferentes aportes térmicos são mostrados na Tabela 5.…”

Section: Resultsunclassified

“…Com a progressiva diminuição do aporte térmico, a fase austenítica precipitou-se preferencialmente na região de contorno de grão. Isto ocorre devido à diminuição do tempo de resfriamento, desta forma, não há tempo suficiente para a formação da austenita na região central do grão [6].…”

Section: * Contribuição Técnica Ao 71º Congresso Anual Da Abm -Internunclassified

“…A literatura recomenda que o aporte térmico esteja entre os valores de 0,5KJ/mm e 2,5KJ/mm para a soldagem dos aços inoxidáveis duplex em geral [5]. Neste contexto, Aguiar e colaboradores [6] fizeram um comparativo da fração volumétrica das fases ferrita e austenita utilizando a técnica de difração de elétrons retroespalhados (EBSD) com o objetivo de caracterizar a microestrutura especialmente a sua morfologia e a constituição do aço inoxidável lean duplex. Estes resultados foram comparados com outros resultados obtidos usando a técnica de microscopia óptica.…”

Section: Introductionunclassified

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Análise Microestrutural De Um Aço Inoxidável Duplex Uns S32304 Submetido Ao Processo De Soldagem Gmaw

Grilo¹,

Siqueira²,

Arruda³

et al. 2017

Anais Do Congresso Anual Da ABM

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ResumoO presente trabalho teve como objetivo analisar as diferentes microestruturas do aço inoxidável duplex UNS S32304 obtidas pelo processo de soldagem Gas Metal Arc Welding (GMAW). As regiões do metal base, zona fundida e zona afetada pelo calor foram investigadas nos corpos de prova com diferentes aportes térmicos. As microestruturas obtidas foram caracterizadas utilizando-se a microscopia óptica (MO). As imagens de Mo obtidas na zona afetada pelo calor mostram que a fração de austenita aumentou com o aumento do aporte térmico. Este aumento está relacionado ao alto teor de cromo e molibdênio presentes no metal de adição utilizado na soldagem. Na zona fundida, a fração de austenita de widmansttaten foi observada com maior frequência na microestrutura do corpo de prova soldado com o aporte térmico de 1,87KJ/mm. Essa maior fração de austenita de widmansttaten observada para o aporte térmico de 1,87KJ/mm está relacionada com o maior tempo de permanência em altas temperaturas deste corpo de prova em relação aos outros corpos de prova investigados. Vale ressaltar que a adição de nitrogênio também promove a formação desta fase. De modo geral, os resultados da metalografia quantitativa mostram que a porcentagem de ferrita foi superior a 65% nas zonas termicamente afetadas e fundidas. Palavras-chave: Aços inoxidáveis duplex; Soldagem; GMAW; Fase sigma; Microestrutura. MICROSTRUCTURAL ANALYSIS OF A DUPLEX STAINLESS STEEL UNS S32304SUBMITTED TO GMAW WELDING PROCESS. Abstract The microstructures of the duplex stainless steel obtained by the Gas Metal Arc Welding (GMAW) were evaluated. The base metal, fusion zone and the heat-affected zone were investigated in the samples with different heat inputs. The microstructures were characterized using light microscopy (LM). The LM images obtained in the heat-affected zone shows that the austenite volume fraction increased with the heat input increase. This increase is related to high contents of the chromium and molybdenum present in the filler metal used in welding. The fusion zone, the widmansttaten austenite volume fraction was observed more frequently in the microstructure with heat input of 1,87KJ/mm. This higher widmansttaten austenite volume fraction with the heat input of 1,87KJ/mm is related to the higher cooling time at high temperatures in this sample in relationship to the others investigated samples. It is noteworthy that the addition of nitrogen also promotes this phase. In general, the results of the quantitative metallography showed that the percentage of ferrite was greater than 65% in the heataffected and fusion zones. Keywords: UNS 32304; Welding microstructure; GMAW; Sigma-phase; Microestruture. UFF, Volta Redonda, RJ, Brasil. 3 Graduando em engenharia metalúrgica, UFF, Volta Redonda, RJ, Brasil. 731

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Microstructure characterization of a duplex stainless steel weld by electron backscattering diffraction and orientation imaging microscopy techniques

Cited by 21 publications

References 20 publications

Effect of Warm Rolling and Annealing on Microstructure, Texture, and Mechanical Properties of a 2205 Duplex Stainless Steel

Effect of Warm Rolling and Annealing on Microstructure, Texture, and Mechanical Properties of a 2205 Duplex Stainless Steel

Electrochemical study of passive films formed on welded lean duplex stainless steel

Análise Microestrutural De Um Aço Inoxidável Duplex Uns S32304 Submetido Ao Processo De Soldagem Gmaw

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