The advantage of grain refinement in the hydrogen embrittlement of Fe–18Mn–0.6C twinning-induced plasticity steel

Park, Il Jeong; Lee, Sang min; Jeon, Hyun hee; Lee, Young Kook

doi:10.1016/j.corsci.2015.01.012

Cited by 112 publications

(42 citation statements)

References 32 publications

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“…However, it is important from a theoretical perspective to consider more complex local equilibrium scenarios [21], with both binding energy E B and trap density N T B , which may better predict HE behaviour. A reduction of HE susceptibility through grain refinement was also suggested for drawn austenite [158]. It was reported that grain refinement minimised the formation of brittle phases.…”

Section: Hydrogen Embrittlement Mitigation Strategies and Design Of Nmentioning

confidence: 99%

Understanding and mitigating hydrogen embrittlement of steels: a review of experimental, modelling and design progress from atomistic to continuum

et al. 2018

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Hydrogen embrittlement is a complex phenomenon, involving several lengthand timescales, that affects a large class of metals. It can significantly reduce the ductility and load-bearing capacity and cause cracking and catastrophic brittle failures at stresses below the yield stress of susceptible materials. Despite a large research effort in attempting to understand the mechanisms of failure and in developing potential mitigating solutions, hydrogen embrittlement mechanisms are still not completely understood. There are controversial opinions in the literature regarding the underlying mechanisms and related experimental evidence supporting each of these theories. The aim of this paper is to provide a detailed review up to the current state of the art on the effect of hydrogen on the degradation of metals, with a particular focus on steels. Here, we describe the effect of hydrogen in steels from the atomistic to the continuum scale by reporting theoretical evidence supported by quantum calculation and modern experimental characterisation methods, macroscopic effects that influence the mechanical properties of steels and established damaging mechanisms for the embrittlement of steels. Furthermore, we give an insight into current approaches and new mitigation strategies used to design new steels resistant to hydrogen embrittlement.

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Section: Hydrogen Embrittlement Mitigation Strategies and Design Of Nmentioning

confidence: 99%

Understanding and mitigating hydrogen embrittlement of steels: a review of experimental, modelling and design progress from atomistic to continuum

et al. 2018

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“…strain rate dependence of hydrogen embrittlement). However, as found by other authors, (Takasawa et al 2012;Park et al 2015;Macadre et al 2015), the grain refinement mitigation of embrittlement in Slow Strain Rate tests (SSRT) is expected to happen due to the redistribution of the same amount of hydrogen over a higher boundary surface so the local segregation and the subsequent intergranular decohesion is reduced.…”

Section: Polycrystalline Modelmentioning

confidence: 73%

Analysis of hydrogen permeation tests considering two different modelling approaches for grain boundary trapping in iron

et al. 2019

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The electrochemical permeation test is one of the most used methods for characterising hydrogen diffusion in metals. The flux of hydrogen atoms registered in the oxidation cell might be fitted to obtain apparent diffusivities. The magnitude of this coefficient has a decisive influence on the kinetics of fracture or fatigue phenomena assisted by hydrogen and depends largely on hydrogen retention in microstructural traps. In order to improve the numerical fitting of diffusion coefficients, a permeation test has been reproduced using FEM simulations considering two approaches: a continuum 1D model in which the trap density, binding energy and the input lattice concentrations are critical variables and a polycrystalline model where trapping at grain boundaries is simulated explicitly including a segregation factor and a diffusion coefficient different from that of the interior of the grain. Results show that the continuum model captures trapping delay, but it should be modified to model the trapping influence on the steady state flux. Permeation behaviour might be classified according to different regimes depending on deviation from Fickian diffusion. Polycrystalline synthetic permeation shows a strong influence of segregation on output flux magnitude. This approach is able to simulate also the short-circuit diffusion phenomenon. The comparison between different grain sizes and grain boundary thicknesses by means of the fitted apparent diffusivity shows the relationships between the registered flux and the characteristic parameters of traps.

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“…The decrease in the ductility of steel after hydrogencharging can be caused by various factors -hydrogenenhanced strain-induced phase transformations [2], mi-crostructural changes (twinning, increase in dislocation density, microlocalization of plastic flow and slip localization, etc.) [16,21], the availability of particles [11] and grain boundaries [22][23][24]. The authors [10] reported that chromium nitrides in HNS are able to absorb and accumulate a small amount of hydrogen in comparison with bulk saturation of grains.…”

Section: Resultsmentioning

confidence: 99%

Influence of Hydrogen-Charging Regime on Strain Hardening and Deformation Mechanism of Hot-Rolled High-Nitrogen Austenitic Steel

et al. 2018

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The effect of hot-rolling and electrochemical hydrogen-charging on strength properties, strain hardening and deformation mechanisms of a high-nitrogen austenitic vanadium-containing Fe-17Cr-24Mn-1.3V-0.2C-0.8N steel was studied by uniaxial tensile tests, scanning and transmission electron microscopy. Hydrogen-charging for 15, 37, and 43 h reduces a yield strength, an ultimate tensile strength and elongation in the steel specimens. Hydrogencharging for 37-43 h leads to increase in strain-hardening coefficient at early degrees of deformation (up to 10%) compared to uncharged and 15 h-charged specimens. Hydrogen influences the deformation mechanisms of the high-nitrogen steel: besides dislocation slip, one of the main deformation mechanisms of hydrogen-containing steel specimens is mechanical twinning. Hydrogen-charging promotes twinning, microlocalization of a plastic flow and γ → ε martensitic transformation in the steel.

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The advantage of grain refinement in the hydrogen embrittlement of Fe–18Mn–0.6C twinning-induced plasticity steel

Cited by 112 publications

References 32 publications

Understanding and mitigating hydrogen embrittlement of steels: a review of experimental, modelling and design progress from atomistic to continuum

Understanding and mitigating hydrogen embrittlement of steels: a review of experimental, modelling and design progress from atomistic to continuum

Analysis of hydrogen permeation tests considering two different modelling approaches for grain boundary trapping in iron

Influence of Hydrogen-Charging Regime on Strain Hardening and Deformation Mechanism of Hot-Rolled High-Nitrogen Austenitic Steel

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