Influence of Molybdenum on Microstructure and Pitting Corrosion Behavior of Solution-Treated Duplex Stainless Steel in a Lithium Chloride Solution

Rezende, Stephania Cappellari de; Dainezi, Isabela; Apolinario, Raira Chefer; Sousa, Lucíola Lucena de; Mariano, Neide Aparecida

doi:10.1590/1980-5373-mr-2019-0138

Cited by 9 publications

(10 citation statements)

References 33 publications

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“…Thus, DSS becomes more susceptible to the localized corrosion, for being sensitive to active dissolution and contributing to the degradation of passive film stability (Hilders et al, 2018, Jinlong et al, 2015, Lacerda et al, 2015, Li, Lo, Kwok, Sun & Lai, 2018, Mandal, 2016, Mohammed, Shrikrishna & Sathiya, 2016, Verma & Taiwade, 2017. Furthermore, the formation of α' causes a cross-stich displacement, leading to a decreased mobility of disagreements, leading to an increase in hardiness, in the yield point and mechanical resistance, besides reducing toughness and elongation (Appleton, 2019, Llorca-Isern, López-Jiménez, López-Luque, Biezma & Roca, 2016, Mandal, 2016, Marques, Silva & Santos, 2020, Mohammed et al, 2016, Paulraj & Garg, 2015, Rezende et al 2018, Rezende, Dainezi, Apolinario, Sousa & Mariano, 2019, Rivolta, Gerosa & Tavasci, 2018, Verma & Taiwade, 2017.…”

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 values of the corrosion potentials (E corr ) were extracted from Figure 10a, as specified in Table 3. It was verified that the potentials increased with time, thus characterizing the formation of a passive film on the metallic surface [33][34][35][36][37] .…”

Section: Resultsmentioning

confidence: 99%

Effect of Rapid Solidification Processing on the Microstructure and Corrosion of 316L Austenitic Stainless Steel

et al. 2022

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Austenitic stainless steels processed by rolling are widespread in technological applications, since they have excellent mechanical and corrosion properties. This study investigated the effect of the cooling rate, microstructure and properties of 316L austenitic stainless steel under cold rolled conditions and by rapid solidification. The microstructure of the cold rolling processing steel was composed of austenite and a low percentage of delta ferrite. For the rapid solidification condition, the microstructure evolved from columnar and acicular dendrites to equiaxed dendrites with decreasing cooling rates, without the presence of delta ferrite due to the high cooling rate. Furthermore, thermal analyses in both routes revealed that oxidation kinetics was slower after rapid solidification in synthetic air. The microhardness in the cold rolling condition was lower than in the rapid solidification condition since the microstructure under the solidification condition is more refined. The sample in the rapid solidification condition region RS1 presented the highest corrosion resistance considering the pit potential. The passivation current density in the cold rolled condition was 5.72x10 -5 A/cm 2 , while under the rapid solidification condition, regions RS1 and RS2 were 2.24x10 -5 A/cm 2 and 3.72x10 -6 A/cm 2 , respectively, and region RS3, did not present a passivation region in a broad range of potentials.

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“…Duplex stainless steels (DSS) are based on Fe-Cr-Ni alloys that show a favorable combination of two phases in equal fractions, namely austenite (γ) and ferrite (δ), with chemical elements called austenitizing (Ni, N, C, Mn, Cu) and ferritizing (Cr, Mo, Si) stabilizers [1][2][3][4] , which, respectively, confer ductility and stress corrosion resistance. In general, carbide precipitation does not occur, due to the very low contents of carbon in DSS.…”

Section: Introductionmentioning

confidence: 99%

“…The good properties of this steel class can be attributed to the low C content and a two-phase microstructure composed of elements of stabilizing ferrite and austenite alloys 5,6 . Consequently, duplex stainless steels can be used under most severe temperature conditions and in chloride environments, where austenitic steels are usually susceptible to pitting, cracking and stress corrosion [2][3][4]7,8 .…”

Section: Introductionmentioning

confidence: 99%

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Dilatometric Cycles in the Study of Precipitation of Intermetallic Phases in Duplex Stainless Steels

et al. 2020

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Duplex stainless steels (DSS) are used in offshore platforms due to their good properties resulting from the combination of two phases, namely austenite and ferrite. Secondary intermetallic phases, such as alpha prime (α´) and sigma (σ), which are harmful, can be formed at temperatures above 400 °C, or by a casting process. This study investigates the formation of sigma phase by thermal cycles running in a dilatometer (800 °C, 850 °C, 900 °C and 1,000 °C) for 1h, and at 850 °C for 3h and 7h. The optical microscopy of the DSS microstructure subjected to 800, 850 and 900 °C for one hour revealed a small fraction of σ phase with nucleation in the contour of ferrite/austenite phases, and tests by ferritoscope indicated a decrease (~4%) in a magnetic fraction (ferrite). However, samples subjected to dilatometric cycles at 850 °C for 3 hours showed an 18% decrease in the magnetic phase and quantitative metallography revealed a 33% fraction of σ phase precipitated in the ferrite phase. Tests conducted at 850 ºC for 7 hours indicated a high fraction of σ phase precipitated (approximately 50%), starting in the grain boundary, austenite/ferrite, and advancing in ferrite grain.

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Influence of Molybdenum on Microstructure and Pitting Corrosion Behavior of Solution-Treated Duplex Stainless Steel in a Lithium Chloride Solution

Cited by 9 publications

References 33 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

Effect of Rapid Solidification Processing on the Microstructure and Corrosion of 316L Austenitic Stainless Steel

Dilatometric Cycles in the Study of Precipitation of Intermetallic Phases in Duplex Stainless Steels

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