The role of plasticity and hydrogen flux in the fracture of a tempered martensitic steel: A new design of mechanical test until fracture to separate the influence of mobile from deeply trapped hydrogen

Guedes, D.; Malheiros, Livia Cupertino; Oudriss, A.; Cohendoz, S.; Bouhattate, J.; Creus, Juan; Thébault, Florian; Piette, M; Feaugas, X.

doi:10.1016/j.actamat.2019.12.045

Cited by 56 publications

(17 citation statements)

References 76 publications

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“…In a recent work [52] on a tempered martensite steel, the individual roles of diffusible and deeply trapped hydrogen on HE failure was identified, however, the roles of lattice H and reversibly trapped H (e.g. H trapped by dislocations etc.)…”

Section: Resultsmentioning

confidence: 99%

A fast fracture approach to assess hydrogen embrittlement (HE) susceptibility and mechanism(s) of high strength martensitic steels

et al. 2021

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Section: Resultsmentioning

confidence: 99%

A fast fracture approach to assess hydrogen embrittlement (HE) susceptibility and mechanism(s) of high strength martensitic steels

et al. 2021

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“…Недостатком такой зависимости является принципиальное несоответствие закону сцепления при малых δ, поэтому чаще применятся кусочно-линейная зависимость [58,81]: Таким образом, имеется ряд неизученных проблем и противоречий в совокупности подходов, которые называются HEDE-моделью водородной хрупкости. Но все они содержат один очень существенный недостаток -для расчетов необходимо наличие трещины с известными параметрами.…”

Section: перераспределение и накопление водородаunclassified

Models of hydrogen influence on the mechanical properties of metals and alloys

Yakovlev

Polyanskiy

Sedova

et al. 2020

PNRPU Mechanics Bulletin

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The article yields a survey of the key models of mechanics that are used to describe the effects of hydrogen embrittlement, hydrogen cracking, and hydrogen-induced destruction. The main attention is paid to models which are used to calculate the stress-strain state of metal samples, parts and machine components and have the potential for specific engineering applications. From a mechanical perspective, the effect of hydrogen on the material properties is a classic problem of the influence of a small parameter, since the hydrogen concentrations critical for the strength and ductility of metals are usually small. In the vast majority of models this effect is reduced to the hydrogen redistribution within the material volume and localization of concentrations in the critical fracture zones. The authors identified four main approaches that allow one to take into account the influence of a small parameter: (i) hydrogen-enhanced decohesion (HEDE), (ii) hydrogen-enhanced localized plasticity (HELP), (iii) account for additional internal pressure due to the hydrogen dissolved in metals, and (iv) bi-continuum approach that takes into account the internal hydrogen pressure and weakening of material in the framework of a special model of a solid. The links between the main approaches are established. Systematization of publications was carried out, similarities and differences in the description of the internal transport and accumulation of hydrogen in metals are highlighted. It is indicated that the predominant number of publications is devoted to the HEDE model, but so far there is no published data on the application of this model to real problems of engineering practice; only modeling the results of mechanical tests of cylindrical and prismatic samples were considered. In fact, other less popular approaches have more practical applications. The main unresolved issue in the verification of all models is the local concentration of hydrogen, which is a source of premature destruction of metals under load. All the methods for measuring local concentrations are indirect. Even in the case of applying sophisticated physical methods, mechanical surface preparation is required, which destroys the initial natural concentration of hydrogen. The lack of reliable data on the distribution of hydrogen concentration excludes the possibility of unambiguously determination of all the model parameters. On the one hand, it allows fitting to any experimental data, and on the other hand, it reduces the predictive engineering value of all models, since a qualitative fitting is not sufficient for engineering strength analysis.

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“…Advanced high strength steel has both high strength and good formability, especially a high work hardening index, which helps to improve the energy absorption in the collision process, lightweights the vehicle, and ensures safety. Among the materials with over 1500 MPa strength, hotformed or cold-formed martensitic steels are the most economical choices [2][3][4][5]. However, in using these types of martensitic steels, a major challenge is hydrogen-induced delayed fracture.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Addition of Nb and V on the Microstructural Evolution and Hydrogen Embrittlement Resistance of High Strength Martensitic Steels

Liu

Liao²,

Tang

et al. 2022

Scanning

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Hydrogen embrittlement can easily occur in high strength martensitic steel, manifesting itself as a sudden failure or fracture without warning and greatly threatening the safety of automotive applications. Optimizing the composition of the alloy can be performed by matching heat treatment processing methods and controlling the precipitation amounts to form hydrogen traps. In doing so, the hydrogen embrittlement susceptibility of steel can be effectively delayed, reducing the risk of hydrogen-induced delayed cracking. In this study, four kinds of 1500 MPa strength grade martensitic steel were selected for testing and supplemented with different loadings of Nb and V, respectively. Their grains, phases, and precipitations were compared by optical microscopy (OM), electron backscattered diffraction (ESBD), and transmission electron microscopy (TEM) analyses. After the addition of Nb and V, the microstructure was refined, the residual austenite content increased, and the hydrogen embrittlement resistance was significantly improved.

show abstract

The role of plasticity and hydrogen flux in the fracture of a tempered martensitic steel: A new design of mechanical test until fracture to separate the influence of mobile from deeply trapped hydrogen

Cited by 56 publications

References 76 publications

A fast fracture approach to assess hydrogen embrittlement (HE) susceptibility and mechanism(s) of high strength martensitic steels

A fast fracture approach to assess hydrogen embrittlement (HE) susceptibility and mechanism(s) of high strength martensitic steels

Models of hydrogen influence on the mechanical properties of metals and alloys

Effects of the Addition of Nb and V on the Microstructural Evolution and Hydrogen Embrittlement Resistance of High Strength Martensitic Steels

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