Hydrogen embrittlement associated with strain localization in a precipitation-hardened Fe–Mn–Al–C light weight austenitic steel

Koyama, Motomichi; Springer, Hauke; Merzlikin, Sergiy Vasil ́ović; Tsuzaki, Kaneaki; Akiyama, Eiji; Raabe, Dierk

doi:10.1016/j.ijhydene.2013.12.171

Cited by 181 publications

(67 citation statements)

References 64 publications

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“…To the best of our knowledge, however, the hydrogen trapping by κ-phases has not been explicitly addressed theoretically. There are two experimental publications which assume an irreversible hydrogen trapping at the interface between κ-carbides and the Fe matrix [21,22], and another contribution attributing rather large activation energies of 76 and 80 kJ/mol for hydrogen desorption in the κ-carbides [23]. The mechanistic details, however, are not yet understood.…”

Section: Introductionmentioning

confidence: 99%

The Role of κ-Carbides as Hydrogen Traps in High-Mn Steels

Timmerscheidt

Dey

Bogdanovski

et al. 2017

Metals

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Abstract:Since the addition of Al to high-Mn steels is known to reduce their sensitivity to hydrogen-induced delayed fracture, we investigate possible trapping effects connected to the presence of Al in the grain interior employing density-functional theory (DFT). The role of Al-based precipitates is also investigated to understand the relevance of short-range ordering effects. So-called E2 1 -Fe 3 AlC κ-carbides are frequently observed in Fe-Mn-Al-C alloys. Since H tends to occupy the same positions as C in these precipitates, the interaction and competition between both interstitials is also investigated via DFT-based simulations. While the individual H-H/C-H chemical interactions are generally repulsive, the tendency of interstitials to increase the lattice parameter can yield a net increase of the trapping capability. An increased Mn content is shown to enhance H trapping due to attractive short-range interactions. Favorable short-range ordering is expected to occur at the interface between an Fe matrix and the E2 1 -Fe 3 AlC κ-carbides, which is identified as a particularly attractive trapping site for H. At the same time, accumulation of H at sites of this type is observed to yield decohesion of this interface, thereby promoting fracture formation. The interplay of these effects, evident in the trapping energies at various locations and dependent on the H concentration, can be expressed mathematically, resulting in a term that describes the hydrogen embrittlement.

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Section: Introductionmentioning

confidence: 99%

The Role of κ-Carbides as Hydrogen Traps in High-Mn Steels

Timmerscheidt

Dey

Bogdanovski

et al. 2017

Metals

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“…[4][5][6] However, EBSD analysis cannot detect extremely fine microstructure (approximately several nanometers) and dislocation substructure that does not have a large crystallographic misorientation. On the other hand, ECCI can clearly visualize a single dislocation, 1,7,8) thin deformation twin, [9][10][11] cell structure, 9,12) local slip bands, 13) and so forth, whereas EBSD cannot. The combined use of these observational methods can clarify the microstructure dependence of damage evolution behavior.…”

Section: Introduction 1analysis Of Damage Evolution Behaviormentioning

confidence: 99%

Combined Multi-scale Analyses on Strain/Damage/Microstructure in Steel: Example of Damage Evolution Associated with <i>ε</i>-martensitic Transformation

et al. 2016

Self Cite

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We studied damage evolution behavior associated with ε-martensite in a Fe-28Mn alloy. Visible factors of damage evolution associated with ε-martensite are considered to be strain distribution, microstructure, micro-void and crack. Combinatorial use of replica digital image correlation, electron backscattering diffraction, and electron channeling contrast imaging enables to clarify the distributions of strain, microstructure and damage. Through quantitative damage analysis, damage evolution behavior was classified into three regimes: (i) incubation regime, (ii) nucleation regime, and (iii) growth regime. In the incubation regime, an interaction of ε/ε-martensite plates and impingement of ε-martensite plates on grain boundaries caused plastic strain localization owing to plastic accommodation. In the nucleation regime, accumulation of the plastic strain on the boundaries caused microvoid formation. The damage propagated along with the boundaries through coalescence with other micro-voids, but the propagation was arrested by crack blunting at non-transformed austenite. In the growth regime, the arrested damage grew again when a further plastic strain was provided sufficiently to initiate ε-martensite near the damage.KEY WORDS: high Mn austenitic steel; ε-martensite; damage; replica method; digital image correlation; electron back scatter diffraction; electron channeling contrast imaging.

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“…1,2) To ensure reliability and safety in the practical use of high strength steels, a reduction in the susceptibility to hydrogen embrittlement has become an important issue and hydrogen embrittlement has attracted much attention recently. [3][4][5][6][7][8][9][10][11][12][13] Koyama et al investigated the effect of hydrogen embrittlement of a Fe-18Mn-0.6C austenitic steel (wt.%) by tensile tests with hydrogen charging at various current densities. They reported that the work hardening behavior was not affected by the hydrogen charging.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Conditions and Specimen Composition on Hydrogen Permeation Behavior of Coated and Uncoated Steels during Wet and Dry Corrosion at a Constant Dew Point

Igarashi

Sakairi

2016

ISIJ Int.

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A wet and dry corrosion test with a constant dew point was applied to investigate the effects of scratches and specimen composition on the hydrogen permeation behavior of Zn and 55 mass% Al-Zn coated steels as well as of uncoated steel. There was an etched size controlled scratch formed on specimens with a laser machining technique. The hydrogen permeation current was observed to be independent of the specimen composition and the area of the formed scratches, the corrosion products were observed after the tests. The hydrogen permeation current of the steels with the formed scratches decreased with number of cycles of the wet and dry tests. Except in the first cycle there were no significant changes in the current with cycle number on steels without formed scratches. It was suggested that the composition, scratch, and corrosion products play an important role in the hydrogen permeation behavior during wet and dry corrosion.

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Hydrogen embrittlement associated with strain localization in a precipitation-hardened Fe–Mn–Al–C light weight austenitic steel

Cited by 181 publications

References 64 publications

The Role of κ-Carbides as Hydrogen Traps in High-Mn Steels

The Role of κ-Carbides as Hydrogen Traps in High-Mn Steels

Combined Multi-scale Analyses on Strain/Damage/Microstructure in Steel: Example of Damage Evolution Associated with <i>ε</i>-martensitic Transformation

Effect of Surface Conditions and Specimen Composition on Hydrogen Permeation Behavior of Coated and Uncoated Steels during Wet and Dry Corrosion at a Constant Dew Point

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