Effect of Sigma Phase Precipitated at 850 °C on Corrosion Behaviour of UNS S82441 Duplex Stainless Steel

Cavalcanti, Daniel Amâncio; Muterlle, Palloma Vieira; Reinke, Gustavo

doi:10.1590/s1517-707620190003.0775

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…The mechanism of nucleation and growth occurs when the chromium content in the ferrite phase is inferior to 23% (mass) and the thermal treatment of aging is performed above 500°C. For this mechanism, the diffusion occurs with a greater reduction in the Gibbs free energy and phase α' is more roughly formed than in the spinodal decomposition, because of the formation of coherent interfaces (Cavalcanti, Muterlle & Reinke, 2019, Haupt, Silva, Falcade, Santos & Reguly, 2019, Kisasoz, Gurel & Karaaslan, 2016, Mehta, Jadhav, Shaikh, Kumar & Kirwai, 2019, Nithin, Sekar & Joseph, 2019, Ogawa & Osuki, 2020, Powar, Gujar, Manthani, Pawar & Singh, 2017, Valeriano, Correa, Mariano, Robin & Machado, 2019.…”

Section: Introductionmentioning

confidence: 99%

Temperature and time effect of thermal aging treatment on microstructure and corrosion resistance of UNS S31803 duplex stainless steel

Dainezi

Borges

Sousa

et al. 2021

RSD

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Duplex stainless steels correspond to a class of steel in which the microstructure is composed basically by the phases ferrite and austenite. Given the metastable character of ferrite, associated phase transformations can occur during thermal treatments, which can lead to a reduction in corrosion resistance. Therefore, the aim of this work was to evaluate the influence of the solution-treated at 1100°C for 30min and aging at 500 and 600°C for 1, 3 and 12h, on the microstructure and corrosion resistance of DSS UNS S31803. The steels were characterized by SEM, EDS, XRD, hardness, microhardness and thermal analysis. The steels aged at 500°C for 1h presented the phase alpha line dispersed in the ferrite, and the steels aged at 600°C for 12h presented the phases alpha line, sigma and chi. In the assays of double cycle potentiodynamic reactivation in solution of 0.5M H2SO4 and 0.01M KSNC, it was observed that no sensitization occurred. Furthermore, in the tests of cyclic potentiodynamic polarization, in 3.5% NaCl solution, it was verified that the precipitation of the alpha line phase did not alter corrosion resistance; nevertheless, the sigma phase reduced corrosion resistance.

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Section: Introductionmentioning

confidence: 99%

Temperature and time effect of thermal aging treatment on microstructure and corrosion resistance of UNS S31803 duplex stainless steel

Dainezi

Borges

Sousa

et al. 2021

RSD

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“…The 12 samples were first heated to 1050°C and held in an oven for 60 minutes to dissolve precipitates and intermetallic phases in the microstructure of the material. In the aging heat treatment, 9 samples were heated again to a temperature of 850ºC and held for 15, 30 and 60 minutes [3,11]. In this way, 12 different samples were prepared.…”

Section: Heat Treatmentsmentioning

confidence: 99%

“…Stainless steels are materials used in a wide variety of applications, including the chemical and petrochemical industries, power generation, pumps, implants, and surgical instruments, as well as a variety of other consumer and commercial products [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Laves phase precipitation and sigma phase transformation in a duplex stainless steel microalloyed with niobium.

Cardoso

Baptista

2022

Matéria (Rio J.)

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Duplex stainless steels are used to replace austenitic steels in industrial applications, especially in the chemical industry where corrosion resistance in chloride-containing media is an important requirement. According to literature, niobium has a great influence on the transformation of the phases of these steels (ferrite, austenite and sigma). Given the interest in evaluating this property in terms of wear resistance and corrosion of the material, the aim of this study was to evaluate the effect of niobium on the formation in austenitic-ferritic stainless steel SEW 410 Nr 1.4517 after heat treatment at 850ºC for 15, 30 and 60 minutes. The niobium contents studied were 0.2; 0.5 and 1.5 wt%. Measurements of microhardness, electrochemical tests in saline solution containing 3.5% sodium chloride and wear resistance were carried out. The results show that an increase in niobium content and sigma phase leads to an increase in hardness and wear resistance, associated with a decrease in corrosion potential. Therefore, the use of niobium in austeno-ferritic stainless steel is recommended when wear resistance is an important factor to be considered.

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“…They exhibit high resistance to stress corrosion, but are not immune to cracking. The best mechanical properties and resistance to corrosion are obtained with a microstructure composed of equal parts of ferrite and austenite and are free of third phases [1][2][3]. The austenitic phase is formed by solid state transformation from the ferritic phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal aging on the microstructure and mechanical properties of stainless steel UNS S31803

et al. 2022

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Duplex stainless steel UNS S31803 exhibits high mechanical strength with high corrosion properties, due to its microstructure composed of ferrite and austenite phases, in equal proportion. When the UNS S31803 steel is submitted to high temperatures, some precipitations can occur, such as nitrites, carbides, and third phases (e.g. sigma phase -σ, and alpha primeα'). These phases are deleterious in relation to the mechanical properties and corrosion resistance, and their effects are analyzed regarding the properties of the steel. In order to evaluate the precipitation of this deleterious phase, isothermal treatment was done at 500°C for 144 hours (α' phase) and at 850ºC for 80 minutes (σ phase). The results were obtained through the microstructural analysis and tensile tests. The presence of sigma phase was verified in the grain boundary, an increase in the mechanical resistance with a loss of toughness. There was as well as an increase in mechanical resistance with the precipitation of α', with less loss of ductility than that observed in the experiments involving the presence of sigma phase.

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Effect of Sigma Phase Precipitated at 850 °C on Corrosion Behaviour of UNS S82441 Duplex Stainless Steel

Cited by 4 publications

References 9 publications

Temperature and time effect of thermal aging treatment on microstructure and corrosion resistance of UNS S31803 duplex stainless steel

Temperature and time effect of thermal aging treatment on microstructure and corrosion resistance of UNS S31803 duplex stainless steel

Laves phase precipitation and sigma phase transformation in a duplex stainless steel microalloyed with niobium.

Effect of thermal aging on the microstructure and mechanical properties of stainless steel UNS S31803

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