Influence of Loading Rate on the Hydrogen-Assisted Micro-Damage in Bluntly Notched Samples of Pearlitic Steel

Toribio, J.; Vergara, Diego; Lorenzo, Miguel

doi:10.3390/met6010011

Cited by 15 publications

(4 citation statements)

References 42 publications

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“…The literature survey revealed that the research in the HE of metallic materials is focused on analyzing the HE susceptibility in terms of (i) test results (macroscopic level): time to fracture in FIP test [24], fracture load in CERT tests [27][28][29]33,[36][37][38], and geometry of the test samples [10,[32][33][34][35]38], or (ii) HE damage zones (microscopic level): TTS fracture zones [16][17][18][19] and evolution of damage zones [20][21][22][23]. A key issue in this field is the selec-tion of the most adequate round-notch geometry to be used for testing the HE susceptibility of steels.…”

Section: Research Gaps Based On Literature Reviewmentioning

confidence: 99%

“…The HE susceptibility is obtained by comparing the measurements taken during and after the test with similar data obtained in an inert environment [27]. The crosshead speed influence was studied in [28] and the influence of the loading rate on HAMD was analyzed in [29]. In recent times, diverse test methods for evaluating HE susceptibility were considered.…”

Section: Introductionmentioning

confidence: 99%

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Innovative Design of Residual Stress and Strain Distributions for Analyzing the Hydrogen Embrittlement Phenomenon in Metallic Materials

2022

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Round-notched samples are commonly used for testing the susceptibility to hydrogen embrittlement (HE) of metallic materials. Hydrogen diffusion is influenced by the stress and strain states generated during testing. This state causes hydrogen-assisted micro-damage leading to failure that is due to HE. In this study, it is assumed that hydrogen diffusion can be controlled by modifying such residual stress and strain fields. Thus, the selection of the notch geometry to be used in the experiments becomes a key task. In this paper, different HE behaviors are analyzed in terms of the stress and strain fields obtained under diverse loading conditions (un-preloaded and preloaded causing residual stress and strains) in different notch geometries (shallow notches and deep notches). To achieve this goal, two uncoupled finite element (FE) simulations were carried out: (i) a simulation by FE of the loading sequences applied in the notched geometries for revealing the stress and strain states and (ii) a simulation of hydrogen diffusion assisted by stress and strain, for estimating the hydrogen distributions. According to results, hydrogen accumulation in shallow notches is heavily localized close to the wire surface, whereas for deep notches, hydrogen is more uniformly distributed. The residual stress and plastic strains generated by the applied preload localize maximum hydrogen concentration at deeper points than un-preloaded cases. As results, four different scenarios are established for estimating “a la carte” the HE susceptibility of pearlitic steels just combining two notch depths and the residual stress and strain caused by a preload.

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Section: Research Gaps Based On Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Innovative Design of Residual Stress and Strain Distributions for Analyzing the Hydrogen Embrittlement Phenomenon in Metallic Materials

2022

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“…The experimental results showed that the ductility increased by as much as 60% when the loading speed increased from 7.6 × 10 −6 m/s to 4.2 m/s. Toribo et al [24] analyzed the influence of loading rate on the fracture process of bluntly notched specimens of pearlitic steel under a hydrogen environment. Results indicate that the location of the fracture zone directly depends on the loading rate.…”

Section: Introductionmentioning

confidence: 99%

Ductile Fracture Behavior of Notched Aluminum Alloy Specimens under Complex Non-Proportional Load

Derpeński

2019

Materials

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The paper presents an experimental investigation of the ductile fracture of specimens with different circumferential notches. Specimens made from ENAW_2024-T351 aluminum alloy were subjected to non-proportional tension–torsion loading. The tests were carried out on an MTS testing machine coupled with the ARAMIS 3D 4M vision measuring system, enabling simultaneous non-contact tracking of the elongation and torsional angle of the measurement base. Depending on the assumed notch radius and the non-proportionate load scheme, the critical tensile force and torsional moments that caused the fracture initiation of the specimen were determined. A significant effect of load configurations and notch radius on the shape of the fracture surface as well as the fracture mechanisms causing the failure of specimens was demonstrated. The equation describing the configuration of critical loads for specimens with different notch radii was applied.

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“…The analyses of such changes revealed a progressive increment of the microstructural anisotropy as the drawing degree is increased. These microstructural changes also affect the macroscopic mechanical behavior of the material [20][21][22], as in their fatigue and fracture behavior [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Tensile Fracture Behavior of Progressively-Drawn Pearlitic Steels

Toribio

Ayaso

González

et al. 2016

Metals

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Abstract:In this paper a study is presented of the tensile fracture behavior of progressively-drawn pearlitic steels obtained from five different cold-drawing chains, including each drawing step from the initial hot-rolled bar (not cold-drawn at all) to the final commercial product (pre-stressing steel wire). To this end, samples of the different wires were tested up to fracture by means of standard tension tests, and later, all of the fracture surfaces were analyzed by scanning electron microscopy (SEM). Micro-fracture maps (MFMs) were assembled to characterize the different fractographic modes and to study their evolution with the level of cumulative plastic strain during cold drawing.

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Influence of Loading Rate on the Hydrogen-Assisted Micro-Damage in Bluntly Notched Samples of Pearlitic Steel

Cited by 15 publications

References 42 publications

Innovative Design of Residual Stress and Strain Distributions for Analyzing the Hydrogen Embrittlement Phenomenon in Metallic Materials

Innovative Design of Residual Stress and Strain Distributions for Analyzing the Hydrogen Embrittlement Phenomenon in Metallic Materials

Ductile Fracture Behavior of Notched Aluminum Alloy Specimens under Complex Non-Proportional Load

Tensile Fracture Behavior of Progressively-Drawn Pearlitic Steels

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