Investigation of Lüders Deformation in the Mild Steel

Данилов, В. И.; Горбатенко, В. В.; Зуев, Л. Б.; Орлова, Д. В.; Данилова, Л. В.

doi:10.17073/0368-0797-2017-10-831-838

Cited by 6 publications

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“…Here, the deformation plateau is associated with a continuous process of twinning over the test sample (i.e., propagation). In other cases, in polycrystalline TiNi-based alloys with shape memory, the stress drop represented by the yield spike indicates the initiation (as a sharp wedge on the graph) and subsequent propagation of Luders bands, i.e., deformation bands on a macroscopic scale [34,35]. Thus, the plateau of the deformation curve in this case can be associated with a Luders-like deformation [36], but only under tensile.…”

Section: Concentration Dependency Of the Martensitic Shear Stress In ...mentioning

confidence: 95%

The Effect of Cobalt on the Deformation Behaviour of a Porous TiNi-Based Alloy Obtained by Sintering

et al. 2021

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This research investigates the effect of cobalt on the deformation behaviour of a porous TiNi-based alloy that was obtained by sintering. Porous TiNi-based alloys with cobalt additives, accounting for 0–2 at. % and with a pitch of 0.5, were obtained. The structural-phase state of the porous material was researched by X-ray structural analysis. The effect of different amounts of Co (used as an alloying additive) on the deformation behaviour was investigated by tensile to fracture. The fractograms of fracture of the experimental samples were analysed using scanning electron microscopy. For the first time, the present research shows a diagram of the deformation of a porous TiNi-based alloy that was obtained by sintering under tensile. The stages of deformation were described according to the physical nature of the processes taking place. The effect of the cobalt-alloying additive on the change in the critical stress of martensitic shear was investigated. It was found that the behaviour of the concentration dependency of stress at concentrations under 1.5 at. % Co was determined by an increase in the stress in the TiNi solid solution. This phenomenon is attributed to the arrangement of Co atoms on the Ti sublattice, as well as an increase in the fraction of the B19′ phase in the matrix. The steep rise of the developed forces on the concentration dependency of the martensitic shear stress at 2 at. % Co is presumably attributed to the precipitation hardening of austenite due to the precipitation of finely dispersed coherent Ti3Ni4 phase following the decrease of fraction of martensite. An analysis of fractograms showed that as more cobalt was added, areas of fracture with traces of martensite plates of the B19′ phase started to prevail. At 2 at. % Co these plates fill almost the entire area of the fracture. The research findings presented in this work are of great importance, since they can be used to achieve the set of physical and mechanical properties required for the development of biocompatible materials for implantology.

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Section: Concentration Dependency Of the Martensitic Shear Stress In ...mentioning

confidence: 95%

The Effect of Cobalt on the Deformation Behaviour of a Porous TiNi-Based Alloy Obtained by Sintering

et al. 2021

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“…Эксперименты с малыми образцами [Zuev et al, 2008;Danilov et al, 2017], в которых наблюдались медленные автосолитонные возмущения, в том числе в образцах горных пород, выявили два следующих ключевых факта. Во-первых, скорость автоволнового (автосолитонного) возмущения пропорциональна скорости нагружения:…”

Section: заключениеunclassified

“…Если принять во внимание, что медленные автосолитонные возмущения вызываются не скоростями медленного тренда геоблоков в 1-10 см/год, а более интенсивными подвижками, вызванными напряжениями, накопленными в геосреде за достаточно продолжительное время, то можно сделать следующие оценки. Следуя идее работы [Danilov et al, 2017], что величина K универсальна для всех материалов, включая геосреды, и по порядку величины близка к 20, для скоростей автоволновых возмущений в 1-100 км/год получим, что средние скорости смещений, порождающие эти возмущения, будут лежать в диапазоне 0.05-5.00 км/год или 1.6×(10 −4 -10 −2 ) см/с. Подобные скорости смещений, действующие в течение характерных времен прохождения медленных автосолитонных возмущений от нескольких минут до суток (крип) [Bornyakov et al, 2017], должны привести к смещениям от нескольких сантиметров до нескольких метров.…”

Section: заключениеunclassified

“…Такой прием сжатия физического времени позволяет на 3-4 порядка сократить время расчетов и выполнить моделирование за приемлемое время. С учетом эмпирического факта пропорциональности наблюдаемых медленных автосолитонных возмущений скорости нагружения на границе [Danilov et al, 2017] этот прием не вносит искажений в наблюдаемую физическую картину. В работах [Balokhonov et al, 2013;Makarov et al, 2018;Makarov, Peryshkin, 2017] показано, что медленные деформационные возмущения можно получить в решениях системы уравнений МДТТ, либо дополняя ее методологией клеточных автоматов для описания перехода среды из упругого состояния в пластическое, либо задавая локальную упругую перегрузку среды с ее переходом в пластическое состояние и с последующей релаксацией напряжений.…”

Section: Introductionunclassified

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The structure of deformation autosoliton fronts in rocks and geomedia

Макаров

Смолин

Mikushina

2021

Geodin. tektonofiz.

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The paper describes numerical modeling of the generation and propagation of the fronts of moving deformation autosolitons in a loaded nonlinear strong medium. It presents solving a system of dynamic equations for solid mechanics, using an equation of state written in a relaxation form that takes into account both an overload of the solid medium and subsequent stress relaxation. The structure of a deformation autosoliton front is investigated in detail. It is shown that the front of a deformation autosoliton that is moving in an elastoplastic medium is a shear band (i.e. a narrow zone of intense shearing strain), which is oriented in the direction of maximum shear stress. Consecutive formation of such shear bands can be viewed as deformation autosoliton perturbations propagating along the axis of loading (compression or extension). A fine structure of a deformation autosoliton front is revealed. It is shown that slow autosoliton dynamics is an integral component of any deformation process, including the seismic process, in any solid medium. In contrast to fast autosoliton dynamics (when the velocities of stress waves are equal to the speed of sound), slow deformation autosoliton perturbations propagate at velocities 5–7 orders of magnitude lower than the velocities of sound. Considering the geomedium, it should be noted that slow dynamics plays a significant role in creating deformation patterns of the crust elements.

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“…Интенсивные исследования эффекта деформационного старения сплавов на различной основе, проводимые в последние годы, можно связать с влиянием деформационного старения (ДС) на функциональные свойства и качество их поверхности [1][2][3][4][5]. Это актуально для строительных сталей нового поколения типа 08Г2Б с феррито-бейнитной (мартенситной) структурой, используемых для магистральных трубопроводов, судов, зданий и т. д.…”

Section: Introductionunclassified

Study of Luders deformation in ultrafine low-carbon steel by the digital image correlation technique

et al. 2019

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The studied steel was a low-carbon microalloyed steel of type 08G2B, used for pipes with an outer diameter of 1420 mm for natural gas transportation with an operation pressure of 11.8 MPa with the chemical composition characterized by a low-carbon content (0.08 wt.%) with additions of Mn, Cr, Mo, Ni and microalloying elements (∑(Nb, V, Ti) ≈ 0.10 wt.%). Secondary refining and continuous casting followed by thermo-mechanical controlled processing (TMCP) with a strict temperature-reduction route and control of the post-deformation cooling rate are used to produce high-strength welded X80 and higher-grade pipes with an extremely ultrafine heterophase structure (d =1-3 μm) and high Charpy energy of more than 250 J / cm 2 at -40°С. Usually sheet metal is not subjected to heat treatment. However, pipes can be heated by applying an anti-corrosion coating at 200 -250°C or by welding in a heat affected zone, which initiates the strain aging effect (SAE). The appearance of SAE can also occur upon prolonged exposure of pipes in the area of climatic temperatures, as well as in the course of installation and operation of pipelines, which inevitably leads to a change in the mechanical properties of the metal. Luders deformation in ultrafine low-carbon microalloyed steel X80 has been studied upon tensile testing by the digital image correlation technique. Two mechanisms of Luders deformation are shown to be observed depending on the strain ageing effect. It is determined that the mechanical behavior of the material at the stage of uniform deformation strongly correlates with the type of Luders deformation.

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Investigation of Lüders Deformation in the Mild Steel

Cited by 6 publications

References 0 publications

The Effect of Cobalt on the Deformation Behaviour of a Porous TiNi-Based Alloy Obtained by Sintering

The Effect of Cobalt on the Deformation Behaviour of a Porous TiNi-Based Alloy Obtained by Sintering

The structure of deformation autosoliton fronts in rocks and geomedia

Study of Luders deformation in ultrafine low-carbon steel by the digital image correlation technique

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