Electrochemical investigation of hydrogen absorption in a duplex stainless steel

Zakroczymski, T.; Owczarek, E.

doi:10.1016/s1359-6454(02)00105-2

Cited by 59 publications

(25 citation statements)

References 22 publications

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“…This was related to the higher hydrogen content. This decrease of ductility is similar to that reported by other authors 5,11,19,21,23 . The difference in the steel ductility can be observed in fracture surfaces (Fig.…”

Section: Resultssupporting

confidence: 92%

“…The residual hydrogen could be associated to the hydrogen trapped inside traps of higher activation energy such as interface γ-α and clusters 11,12 . Materials Research As the hydrogen charging was made in absence of load application, the hydrogen concentration is lower than that obtained by Luu et al 20 and Zakcrocczymski et al 21 . However, this concentration is higher than the threshold total hydrogen concentration (1-5 ppm) which can cause a ductility loss in these steels.…”

Section: (3) (4)mentioning

confidence: 89%

“…However, this concentration is higher than the threshold total hydrogen concentration (1-5 ppm) which can cause a ductility loss in these steels. According with Zakcrocczymski et al 21 the presence only of hydrogen as an interstitial solid solution can decrease the ductility during axial strain.…”

Section: (3) (4)mentioning

confidence: 99%

“…This suggests that the hydrogen transport is mainly in lattice diffusion and hydrogen traps of low energy, which is in according with the results obtained by Luu et al 20 . In addition, more hydrogen should be in ferrite since the hydrogen diffusivity and permeation rate is higher in ferrite than austenite 21,22 . The residual hydrogen could be associated to the hydrogen trapped inside traps of higher activation energy such as interface γ-α and clusters 11,12 .…”

Section: (3) (4)mentioning

confidence: 99%

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In Situ Synchrotron Radiation Measurements During Axial Strain In Hydrogen Cathodically Charged Duplex Stainless Steel SAF 2205

Hoyos

Rodrı́guez

et al. 2017

Mat. Res.

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The objective of this work is the evaluation of hydrogen effects on the martensitic transformation and strain hardening in Duplex Stainless Steels (DSS) SAF 2205 (UNS S32205/S31803). DSS are two-phase alloys (austenite and ferrite), which are used for applications requiring high mechanical strength, in corrosive environments. Therefore, it is necessary a better understanding of the phenomena involved on the hydrogen embrittlement. For this, in situ measurements of X-ray diffraction were made during tensile test in H 2 cathodically charging DSS 2205. The hydrogen charging reduces the stress relaxation, reducing the ductility and suppressing the hydrogen-induced austenitic to martensitic transformation. In addition, it also reduces the strain hardening (dislocation multiplication) in austenite. The strain hardening seems to have a higher influence than martensitic transformation on fracture process, even in absence of hydrogen.

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Section: Resultssupporting

confidence: 92%

Section: (3) (4)mentioning

confidence: 89%

Section: (3) (4)mentioning

confidence: 99%

Section: (3) (4)mentioning

confidence: 99%

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In Situ Synchrotron Radiation Measurements During Axial Strain In Hydrogen Cathodically Charged Duplex Stainless Steel SAF 2205

Hoyos

Rodrı́guez

et al. 2017

Mat. Res.

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“…Os átomos de hidrogênio podem ser gerados por corrosão localizada, por carga catódica associada com processos de proteção catódica ou por interação galvânica, por exemplo, em contacto com um aço de carbono [6]. A susceptibilidade das ligas metálicas à degradação por hidrogênio depende, principalmente, da absorção de átomos de hidrogênio na fase metálica, da mobilidade destes átomos e da distribuição do hidrogênio entre a rede cristalina e os defeitos estruturais os quais agem como armadilhas; os dois últimos fatores estão diretamente relacionados com as características microestruturais do material [7]. A interação de hidrogênio com AID e AISD tem sido caracterizada usando a técnica de permeação eletroquímica de hidrogênio [1,6,8,9].…”

Section: Introductionunclassified

Estudo Da Difusão E Fragilização Por Hidrogênio Em Aço Inoxidável Superduplex

Ceballos¹,

Lage²,

Assis³

et al. 2017

Anais Do Congresso Anual Da ABM

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ResumoOs aços inoxidáveis duplex e superduplex são caracterizados por uma estrutura bifásica contendo ilhas de austenita precipitadas numa matriz de ferrita. Estes aços possuem boas propriedades mecânicas e boa resistência à corrosão. No entanto, estes aços podem apresentar fragilização por hidrogênio. No desenvolvimento deste trabalho se estudou a difusão e fragilização por hidrogênio de um aço inoxidável superduplex SAF 2507 nos estados como recebido e tratado térmicamente. Para avaliar a influência da microestrutura sobre a difusão do hidrogênio foram realizados ensaios de permeação electroquímica de hidrogênio. Observou-se que o coeficiente de difusão aparente aumenta em função da temperatura de recozimento. A influência de hidrogênio na resistência à fratura do material recozido a 1300°C foi estudada a partir de ensaios de tenacidade à fratura (CTOD). Determinou-se que a resistência à fratura do material diminui consideravelmente quando o mesmo é submetido a uma carga de hidrogênio. A presença de hidrogênio também modificou o mecanismo de fratura do material, observou-se uma fratura completamente dúctil no material que foi testado em ausência de hidrogênio e uma fratura frágil, caracterizada por clivagem, foi observada no material hidrogenado. Determinou-se que a fase austenítica pode ser fragilizada sob certas condições de carga de hidrogênio. Palavras-chave: Aços superduplex; Difusão de hidrogênio; Fragilização por hidrogênio; CTOD. STUDY OF HYDROGEN DIFUSSION AND EMBRITTLEMENT IN SUPER DUPLEX STAINLESS STEEL AbstractDuplex stainless steels are characterized by a biphasic structure containing austenite islands precipitated in the ferrite matrix. These steels have good mechanical properties and good corrosion resistance. However, these materials are susceptible to hydrogen embrittlement. In this work has been studied the hydrogen diffusion and embrittlement of super duplex stainless steel SAF 2507 in the material as received and annealed. To evaluate the influence of microstructure on the diffusion have been performed hydrogen electrochemical permeation tests. It was observed that the apparent diffusion coefficient increases with annealing temperature. The influence of hydrogen on toughness of the annealed material was studied using CTOD testing. It was determined that the fracture toughness of the material decreases considerably when it is subjected to hydrogen charge. The presence of hydrogen also changed the material fracture mechanism, a completely ductile fracture of the material has been observed in the material tested in the absence of hydrogen and a brittle fracture, characterized by cleavage, was observed in the hydrogenated material. It has been determined that the austenitic phase could be embrittle by hydrogen under certain conditions.

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Characterization of hydrogen charging of 2205 duplex stainless steel and its correlation with hydrogen‐induced cracking

Luo

Dong

Liu

et al. 2011

Materials & Corrosion

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The effect of various experimental conditions (i.e., hydrogen charging current density, charging time, solution concentration, and temperature) on the embrittlement and cracking susceptibility of 2205 duplex stainless steel was studied by electrochemical hydrogen charging and slow strain rate tests. The results showed that the choice of the experimental conditions had obvious effect on the hydrogen concentration in the specimens. A relationship between the embrittlement and hydrogen charging conditions was established by the investigation of the fracture morphology. Under the free‐charging condition, the fracture surfaces were characteristic of dimples, while on the condition of the dynamic hydrogen charging, the hydrogen‐induced fracture showed the appearance of cleavage. Further examination of fracture cracks confirmed that the ferrite phase acts as a preferential path for crack propagation.

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Electrochemical investigation of hydrogen absorption in a duplex stainless steel

Cited by 59 publications

References 22 publications

In Situ Synchrotron Radiation Measurements During Axial Strain In Hydrogen Cathodically Charged Duplex Stainless Steel SAF 2205

In Situ Synchrotron Radiation Measurements During Axial Strain In Hydrogen Cathodically Charged Duplex Stainless Steel SAF 2205

Estudo Da Difusão E Fragilização Por Hidrogênio Em Aço Inoxidável Superduplex

Characterization of hydrogen charging of 2205 duplex stainless steel and its correlation with hydrogen‐induced cracking

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