Role of drawing-induced residual stresses and strains in the hydrogen embrittlement susceptibility of prestressing steels

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

doi:10.1016/j.corsci.2011.06.012

Cited by 57 publications

(35 citation statements)

References 32 publications

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“…Taking these design requirements into account, the drawing dies are commonly made of high strength and stiffness ceramics materials such as tungsten carbides. Accordingly, in this study, the drawing dies of the drawing chain shown in Figure 2a are modelled as rigid bodies [17]. Two parameters are needed to define the geometry of the drawing die: the inlet die angle (α) and the bearing length (lz) [10].…”

Section: Numerical Modellingmentioning

confidence: 99%

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The Role of Overloading on the Reduction of Residual Stress by Cyclic Loading in Cold-Drawn Prestressing Steel Wires

et al. 2017

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Prestressing steel wires are commonly used as reinforcement elements in structures bearing fatigue loads. These wires are obtained by a conforming process called cold drawing, where a progressive reduction of the wire diameter is produced, causing residual stress in the commercial wire. The aim of this paper is to analyze the effect of diverse in-service cyclic loading conditions (cyclic loading and cyclic loading with overload) on such a residual stress field. To achieve this goal, firstly, a numerical simulation of the wire drawing process of a commercial prestressing steel wire was carried out to reveal the residual stress state induced by the manufacture technique. Afterwards, a numerical simulation was performed of the in-service loading conditions of a prestressing steel wire in which the previously calculated residual stress state is included. The analysis of the obtained results shows a significant reduction of the residual stress state of about 50% for common in-service loadings and as high as 90% for certain cases undergoing overloads during cyclic loading. Therefore, an improvement of the mechanical performance of these structural components during their life in-service can be achieved.

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Section: Numerical Modellingmentioning

confidence: 99%

“…Stress-strain state plays a key role in such a type of failure [17,18]. Thus, a reduction of the residual stress state yields to a reduction of the HE susceptibility of prestressing steel wires, thereby reducing the risk of in-service failure.…”

Section: Introductionmentioning

confidence: 99%

The Role of Overloading on the Reduction of Residual Stress by Cyclic Loading in Cold-Drawn Prestressing Steel Wires

et al. 2017

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“…4,7,[11][12][13][14][15] As shown in Table 6, for the geometries A and C this characteristic depth is relatively close to the notch tip, i.e., hydrogen is driven to a location not far from the notch tip. For the geometries B and D the maximum hydrostatic stress point is placed at the centre of the net section (the bar axis) and hydrogen is "pumped" towards this point by long-term stress-assisted diffusion.…”

Section: Continuum Mechanics Approachmentioning

confidence: 92%

“…Hydrostatic stress plays an important role in hydrogen transport 7,[11][12][13][14] and thus the hydrostatic stress distributions in the samples were obtained by a numerical procedure. The finite element method (FEM) with an elastic-plastic code was applied, using a Von Mises yield surface with an incompressible constitutive equation (classical plasticity).…”

Section: Continuum Mechanics Approachmentioning

confidence: 99%

Time-dependent Triaxiality Effects on Hydrogen-assisted Micro-damage Evolution in Pearlitic Steel

Toribio

2012

ISIJ Int.

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This paper offers a detailed analysis of the hydrogen-assisted micro-damage (HAMD) region in axisymmetric round-notched samples of high-strength eutectoid steel under hydrogen embrittlement environmental conditions. Emphasis is placed on the microscopic appearance and the evolution of such a microscopic topography from the initiation (sub-critical) to the fracture (critical) point. The use of very different notched geometries -with the subsequent various triaxial stress distributions in the vicinity of the notch tip-allows an analysis of the influence of stress state on hydrogen diffusion and micro-cracking. In all cases, the microscopic appearance of the hydrogen-affected zone resembles micro-damage, microcracking or micro-tearing due to hydrogen degradation.

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“…In this paper, the analysis of hydrogen diffusion was performed for a representative of the whole family of cold drawn steels: the wire undergoing three steps of drawing (steel number 3). The following values were used for the computations of hydrogen diffusion in the notched samples: V H = 2ˆ10 6 m 3 /mol [38]; D = 3.21ˆ10´1 1 m 2 /s [39], obtained after linear interpolation between the values for the hot rolled bar (not cold drawn at all, D = 6.6ˆ10´1 1 m 2 /s [40]) and the fully drawn wire (commercial prestressing steel, D = 4.99ˆ10´1 2 m 2 /s [41]). …”

Section: Hydrogen Diffusionmentioning

confidence: 99%

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

Toribio

Vergara

Lorenzo

2016

Metals

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Abstract:The influence of loading rate (crosshead speed) on the fracture process of bluntly notched samples of pearlitic steel under hydrogen environment is analyzed in this paper. Results indicate that the location of the zone where fracture initiates (fracture process zone) in pearlitic steel samples with a blunt notch directly depends on the loading rate or crosshead speed. For slow testing rates, such a zone is placed in the specimen center due to hydrogen diffusion towards the prospective fracture places located in the central area of the section. On the other hand, in the case of high testing rates, the process of hydrogen-assisted fracture initiates near the sample periphery, i.e., in the vicinity of the notch tip, because in such quick tests hydrogen does not have enough time to diffuse towards inner points of the specimen.

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Role of drawing-induced residual stresses and strains in the hydrogen embrittlement susceptibility of prestressing steels

Cited by 57 publications

References 32 publications

The Role of Overloading on the Reduction of Residual Stress by Cyclic Loading in Cold-Drawn Prestressing Steel Wires

The Role of Overloading on the Reduction of Residual Stress by Cyclic Loading in Cold-Drawn Prestressing Steel Wires

Time-dependent Triaxiality Effects on Hydrogen-assisted Micro-damage Evolution in Pearlitic Steel

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

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