Analysis of the influence of microstructural traps on hydrogen assisted fatigue

Fernández-Sousa, Rebeca; Betegón, C.; Martínez‐Pañeda, Emilio

doi:10.1016/j.actamat.2020.08.030

Cited by 91 publications

(46 citation statements)

References 54 publications

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“…Consider a domain Ω ∈ IR n (n ∈ [1,2,3]), with outer boundary δΩ ∈ IR n−1 . The domain contains a deformable solid with displacement field u and internal crack surface Γ ∈ IR n−1 .…”

Section: Potential Energy Of the Solidmentioning

confidence: 99%

Applications of phase field fracture in modelling hydrogen assisted failures

Kristensen

Niordson

Martínez‐Pañeda

2020

Theoretical and Applied Fracture Mechanics

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The phase field fracture method has emerged as a promising computational tool for modelling a variety of problems including, since recently, hydrogen embrittlement and stress corrosion cracking. In this work, we demonstrate the potential of phase field-based multi-physics models in transforming the engineering assessment and design of structural components in hydrogencontaining environments. First, we present a theoretical and numerical framework coupling deformation, diffusion and fracture, which accounts for inertia effects.Several constitutive choices are considered for the crack density function, including choices with and without an elastic phase in the damage response. The material toughness is defined as a function of the hydrogen content using an atomistically-informed hydrogen degradation law. The model is numerically implemented in 2D and 3D using the finite element method. The resulting computational framework is used to address a number of case studies of particular engineering interest. These are intended

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Section: Potential Energy Of the Solidmentioning

confidence: 99%

Applications of phase field fracture in modelling hydrogen assisted failures

Kristensen

Niordson

Martínez‐Pañeda

2020

Theoretical and Applied Fracture Mechanics

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“…Similarly, the threshold stress intensity for hydrogen-assisted cracking generally correlates well with the diffusible hydrogen concentration (Akhurst and Baker, 1981;Gangloff, 2017;Martínez-Pañeda et al, 2018). Lastly, for closed systems containing a finite hydrogen concentration, the introduction of a uniform distribution of strong hydrogen trap sites (such as carbides) has been demonstrated to reduce susceptibility via the sequestering of hydrogen into these benign locations (Bhadeshia, 2016;Fernández-Sousa et al, 2020).…”

Section: Introductionmentioning

confidence: 90%

Comparison of hydrogen diffusivities measured by electrochemical permeation and temperature-programmed desorption in cold-rolled pure iron

Zafra¹,

Harris²,

Sun³

et al. 2021

Preprint

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The diffusivity of hydrogen in cold-rolled pure iron is investigated using permeation and desorption methods. Electrochemical charging, electro-permeation and thermal desorption spectroscopy (TDS) experiments are conducted. Firstly, the relation between the charging current and the hydrogen concentration is established. Secondly, permeation experiments are conducted at 22, 40 and 67 • C to quantify the diffusivity dependence on temperature. Finally, the diffusivity is estimated by using two types of desorption experiments and Fick's law: (i) a 'rest time' method, by which we measure the hydrogen content of samples held at room temperature for different times, and (ii)isothermal desorption experiments at temperatures ranging from 22 to 80 • C, fitting the resulting desorption rate versus time curves. Good agreement is obtained between the isothermal desorption and permeation approaches, with observed differences discussed and rationalised. Moreover, measured diffusivity values for cold-rolled pure iron are also found to be comparable to those reported in the literature. This work demonstrates that isothermal desorption experiments are a convenient approach to determine hydrogen diffusivity over a wide range of temperatures, as facilitated by new TDS systems with fast heating rates.

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“…Dislocations and second phases in the material are often considered hydrogen traps during hydrogen diffusion [ 32 , 33 , 34 ]. Many studies have shown that hydrogen traps in metal materials can be divided into reversible and irreversible hydrogen traps [ 35 , 36 ].…”

Section: Methodsmentioning

confidence: 99%

“…where f c is the hydrogen concentration (mol cm −3 ), T N is the number of hydrogen traps (cm −3 ), and L D is the diffusion coefficient of hydrogen in the lattice (1.28 × 10 −4 cm 2 s −1 ) [31]. Dislocations and second phases in the material are often considered hydrogen traps during hydrogen diffusion [32][33][34]. Many studies have shown that hydrogen traps in metal materials can be divided into reversible and irreversible hydrogen traps [35,36].…”

Section: Hydrogen Electrochemical Permeation Testsmentioning

confidence: 99%

Research on Carbide Characteristics and Their Influence on the Properties of Welding Joints for 2.25Cr1Mo0.25V Steel

Cheng

Qin

et al. 2021

Materials

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The carbide characteristics of 2.25Cr1Mo0.25V steel have an extremely important influence on the mechanical properties of welding joints. In addition, hydrogen resistance behavior is crucial for steel applied in hydrogenation reactors. The carbide morphology was observed by scanning electron microscopy (SEM) and the carbide microstructure was characterized by transmission electron microscopy (TEM). Tensile and impact tests were carried out and the influence of carbides on properties was studied. A hydrogen diffusion test was carried out, and the hydrogen brittleness resistance of welding metal and base metal was studied by tensile testing of hydrogenated samples to evaluate the influence of hydrogen on the mechanical properties. The research results show that the strength of the welding metal was slightly higher and the Charpy impact value was significantly lower compared to the base metal. The hydrogen embrittlement resistance of the welding metal was stronger than that of the base metal. The presence of more carbides and inclusions was the main cause of the decreased impact property and hydrogen brittleness resistance of the welding metal. These conclusions have certain reference value for designing and manufacturing hydrogenation reactors.

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Analysis of the influence of microstructural traps on hydrogen assisted fatigue

Cited by 91 publications

References 54 publications

Applications of phase field fracture in modelling hydrogen assisted failures

Applications of phase field fracture in modelling hydrogen assisted failures

Comparison of hydrogen diffusivities measured by electrochemical permeation and temperature-programmed desorption in cold-rolled pure iron

Research on Carbide Characteristics and Their Influence on the Properties of Welding Joints for 2.25Cr1Mo0.25V Steel

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