Effects of processing and manufacturing of high nitrogen-containing stainless steels on their mechanical, corrosion and wear properties

Hänninen, Hannu; Romu, Jyrki; Ilola, Risto; Tervo, Jyrki; Laitinen, Arttu

doi:10.1016/s0924-0136(01)00804-4

Cited by 221 publications

(133 citation statements)

References 21 publications

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“…Some advantages of high-nitrogen steels are: elevated yield stress; excellent combination of high resistance to the fracture and toughness; resistance to the formation of strain-induced martensite; low magnetic permeability, avoiding the formation of ferromagnetic phases; and good corrosion properties, improving pitting corrosion resistance [3]. The nitrogen is a strong austenite stabilizer, enabling reducing the amount of Ni for the austenite stabilization and, additionally, retarding the precipitation of chromium-and molybdenum-rich phases (σ, χ, M 23 C 6 phases), which are known for spoiling certain properties, mainly due to consumption of chromium from the matrix, causing the increase of sensitization [4,5].…”

Section: Introductionmentioning

confidence: 99%

Interaction between recrystallization and strain-induced precipitation in a high Nb- and N-bearing austenitic stainless steel: Influence of the interpass time

Silva

Gallego

Cabrera

et al. 2015

Materials Science and Engineering: A

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In this work, we studied the influence of the interpass time (20 and 5 s) on the interaction between recrystallization and strain-induced precipitation occurring during multiple passes' deformations under continuous cooling conditions in a high niobium-and nitrogen-bearing austenitic stainless steel (ISO 5832-9). The correlation between microstructure evolution and hot mechanical properties was performed by physical simulation using hot torsion tests. The microstructure evolution was analyzed by optical microscopy, transmission electron microscopy and electron back scattered diffraction (EBSD). This technique indicated that dynamic recrystallization occurred at the first passes promoting an excellent grain refinement. On the other hand, shorter interpass time (5 s) allowed higher volume fraction of smallest precipitates than larger interpass time (20 s). After soaking, only TiNbN precipitates were found, whereas, Z-phase (CrNbN) and NbN were formed during thermomechanical processing. Particles with sizes between 20 and 50 nm were effective to pin grain boundaries and dislocations.2

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Section: Introductionmentioning

confidence: 99%

Interaction between recrystallization and strain-induced precipitation in a high Nb- and N-bearing austenitic stainless steel: Influence of the interpass time

Silva

Gallego

Cabrera

et al. 2015

Materials Science and Engineering: A

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“…A adição de nitrogênio aos aços inoxidáveis austeniticos traz melhoras expressivas em propriedades tais como a resistência a corrosão por pite, corrosão sob tensão e fadiga [8].…”

Section: Introductionunclassified

“…Nos aços inoxidáveis austeniticos o nitrogênio melhora a resistência à corrosão intergranular, pois retarda a precipitação de fases intermetálicas, além do que, a precipitação de nitretos traz uma perda menor no teor de cromo da matriz que na precipitação de carbonetos [8]. A resistência à corrosão localizada e ainda mais acentuada em aços inoxidáveis austeniticos contento molibdênio, pois retardam o início da corrosão e impedem o crescimento do ataque pela imediata repassivação do material [8].…”

Section: Introductionunclassified

“…A resistência à corrosão localizada e ainda mais acentuada em aços inoxidáveis austeniticos contento molibdênio, pois retardam o início da corrosão e impedem o crescimento do ataque pela imediata repassivação do material [8].…”

Section: Introductionunclassified

“…Este fato, aliado a baixa dureza e propriedades tribológicas, limita sua aplicabilidade. Várias técnicas vêm sendo empregadas com o objetivo de melhorar as características superficiais destes aços por meio da adição de nitrogênio em solução sólida [1][2][3][4][5][6][7].A adição de nitrogênio aos aços inoxidáveis austeniticos traz melhoras expressivas em propriedades tais como a resistência a corrosão por pite, corrosão sob tensão e fadiga [8].Nos aços inoxidáveis austeniticos o nitrogênio melhora a resistência à corrosão intergranular, pois retarda a precipitação de fases intermetálicas, além do que, a precipitação de nitretos traz uma perda menor no teor de cromo da matriz que na precipitação de carbonetos [8]. A resistência à corrosão localizada e ainda Autor Responsável: Ricardo Fernando dos Reis Data de envio:…”

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Obtenção de austenita expandida (fase S): Nitretação por plasma em baixa temperatura x SHTPN - Parte 2

Reis

Durante

2015

Matéria (Rio J.)

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RESUMOCorpos de prova de aço inoxidável austenítico ISO 5832-1 apresentando camada superficial rica em nitrogê-nio (fase S), obtidas pelos processos de nitretação por plasma em baixa temperatura e SHTPN (Solution Heat Treatment after Plasma Nitriding), caracterizadas em trabalho anterior, além de amostras na condição de fornecimento, ou seja, solubilizadas, e amostras nitretadas por plasma em 750 ºC por 3 horas foram testadas quanto à resistência a corrosão. A resistência a corrosão foi avaliada com base no método de polarização potenciodinâmica e obtenção de potencial de circuito aberto (E corr vs tempo) em uma solução de 0,5 M NaCl. Os resultados comprovaram o ganho na resistência a corrosão localizada proveniente do nitrogênio em solução sólida, tanto para nitretação em baixa temperatura quanto no processo SHTPN, bem como o efeito deleté-rio proveniente da precipitação do nitreto de cromo. Palavras-chave:Nitretação por plasma, SHTPN, fase "S", ISO 5832-1, corrosão. ABSTRACTSamples of austenitic stainless steel ISO 5832-1 showing nitrogen-rich surface layer (S-phase), obtained by plasma nitriding at low temperature and SHTPN (Solution Heat Treatment after Plasma Nitriding) processes, characterized in previous work, and samples in starting microstructure, in other words, solubilized and plasma samples nitrided at 750° C for 3 hours, were tested for corrosion resistance. The corrosion resistance was evaluated based on the potentiodynamic anodic polarization test and open circuit measurements of corrosion potential (OCP) using 0.5 M NaCl. The results confirmed the gain in localized corrosion resistance from the nitrogen in solid solution in both low-temperature nitriding and SHTPN process, as well as from the deleterious effect of precipitation of chromium nitride.Keywords: Plasma nitriding, SHTPN, S-phase, ISO 5832-1, corrosion. INTRODUÇÃOOs aços inoxidáveis austeníticos são vastamente empregados na indústria por possuírem excelente resistência à corrosão; entretanto, dependendo do meio ao qual estão expostos, podem sofrer corrosão por pite e / ou frestas. Este fato, aliado a baixa dureza e propriedades tribológicas, limita sua aplicabilidade. Várias técnicas vêm sendo empregadas com o objetivo de melhorar as características superficiais destes aços por meio da adição de nitrogênio em solução sólida [1][2][3][4][5][6][7].A adição de nitrogênio aos aços inoxidáveis austeniticos traz melhoras expressivas em propriedades tais como a resistência a corrosão por pite, corrosão sob tensão e fadiga [8].Nos aços inoxidáveis austeniticos o nitrogênio melhora a resistência à corrosão intergranular, pois retarda a precipitação de fases intermetálicas, além do que, a precipitação de nitretos traz uma perda menor no teor de cromo da matriz que na precipitação de carbonetos [8]. A resistência à corrosão localizada e ainda Autor Responsável: Ricardo Fernando dos Reis Data de envio:

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Effect of ammonium bisulphite and chloride on the pitting and stress corrosion cracking resistance of super duplex stainless steel pipes under combined internal pressure and axial tension

Lasebikan

Akisanya

Deans

2018

Materials & Corrosion

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The oil and gas industry, like many others is constantly looking at ways to keep costs of well completion down based on cost effective solutions that do not compromise safety. This combined with the desire to develop new oil and gas fields that are very challenging in terms of operating pressures, temperatures, and corrosivity of the environment may result in the need to utilize materials closer to their mechanical loading limit in a corrosive environment. Modern alloys of high strength and corrosion resistance are often more susceptible to cracking. With a move toward higher production pressures, and temperature, production tubing for downhole use may become a limiting factor for exploration of future oil and gas wells. Typically, materials and corrosion test samples are usually set up to examine material behavior under single mode loading (e.g., tensile sample) and not combined loads experienced by a production tubing in a well completion. A novel test set‐up was developed to simulate stresses in a production tubing string with the potential to define combined load conditions in a corrosive environment once mechanical load limit is determined. In small scale tests cold worked super duplex stainless steel mini pipes were subjected to combined load, that is, axial stress simulating weight of the tubing string and internal pressure (from the reservoir). The mechanical load limit (failure envelope) was determined in the absence of a corrosive environment thereafter the mini pipes were subjected to load conditions below mechanical limit in a corrosive environment to determine load and environment conditions that would not lead to crack initiation. The potential pipe load limit when in the corrosive environment is below the corrosion test load condition to avoid crack initiation and failure.

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Effects of processing and manufacturing of high nitrogen-containing stainless steels on their mechanical, corrosion and wear properties

Cited by 221 publications

References 21 publications

Interaction between recrystallization and strain-induced precipitation in a high Nb- and N-bearing austenitic stainless steel: Influence of the interpass time

Interaction between recrystallization and strain-induced precipitation in a high Nb- and N-bearing austenitic stainless steel: Influence of the interpass time

Obtenção de austenita expandida (fase S): Nitretação por plasma em baixa temperatura x SHTPN - Parte 2

Effect of ammonium bisulphite and chloride on the pitting and stress corrosion cracking resistance of super duplex stainless steel pipes under combined internal pressure and axial tension

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