The relationship between plastic flow macrolocalization and a dislocation structure

Зуев, Л. Б.; Poletika, T. M.; Narimanova, G. N.

doi:10.1134/1.1589577

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…This in turn leads us to admit that the deformation response of certain volumes of the specimen and the propensity of the material for work hardening during plastic flow in the prefracture stage are nonuniform. This point of view is confirmed by findings of an investigation on the evolution of the dislocation structure in the plastic-strain centers in different deformation stages [12]. The results obtained in that work showed that the dislocation substructure in the localized-strain centers developed faster than the substructure in the intervening space between them.…”

Section: Deformation Stages and Macroscale Strain-localization Patternssupporting

confidence: 72%

“…Data on the kinetics of localized plastic strain autowaves in the linear and Taylor work-hardening and prefracture stages were evaluated to show that the autowave velocity can be described by a strain-exponent function valid for all the three portions of the stress-strain curve [2]. The function was first derived in [12] and is of the form Here V 0 is an empirical constant and q is ~1/2. As is shown in [1, 2], the localized plastic strain fronts move at a constant velocity in the case where the stressstrain curve exhibits a linear work-hardening stage with the strain exponent n = 1.…”

Section: Deformation Stages and Macroscale Strain-localization Patternsmentioning

confidence: 99%

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Special features of the localized plastic deformation and fracture of high-chromium steel of the martensitic class

et al. 2009

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The deformation behavior of high-chromium steel (0.4%C-0.6%Si-0.55%Mn-12.5%Cr) of martensitic structure upon quenching and of sorbitic structure upon high-temperature tempering has been investigated. Each of the states is shown to be represented by a particular stress-strain curve. The stress-strain curve for the steel in the martensitic state consists of a single linear-hardening stage, whereas in the sorbitic state, it exhibits a three-stage deformation pattern. The plastic flow of the examined material in the two states has been found to be of a localized character. The evolution of localized-strain center distributions follows the law of plastic flow, i.e., it depends on the deformation stages in the stress-strain curve. The fracture process is determined by the kinetics of the localized-strain centers in the final (prefracture) deformation stage in the stress-strain curve.

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Section: Deformation Stages and Macroscale Strain-localization Patternssupporting

confidence: 72%

Section: Deformation Stages and Macroscale Strain-localization Patternsmentioning

confidence: 99%

Special features of the localized plastic deformation and fracture of high-chromium steel of the martensitic class

et al. 2009

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“…On the macro-and meso-scale levels deformation defects would accumulate in the above zone. The distinctive features of dislocation substructure and micro-texture of material within a localization nucleus are described in [11]. It has been shown previously that on the meso-scale level, the deformation development involves formation of meso-bands or folds ultrafine grain titanium [5,6].…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Plastic Deformation Macrolocalization. Local Stresses and Fracture in Ultrafine Grain Titanium

Данилов¹,

Shlyakhova²,

Семухин³

2014

AMM

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The process of plastic deformation in ultrafine grain titanium is considered. Using the methods of speckle photography and X-ray diffractometry, the distributions of local strains and of local elastic distortions were examined for the test sample work. It is shown that the method of atomic-force microscopy can be used effectively for qualitative and quantitative assessment of ultrafine grain material structure.

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Macrolocalization of Plastic Deformation and Staging of Plastic Flow in Polycrystalline Metals and Alloys

Данилов

Зуев

2008

Usp. Fiz. Met.

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Исследованы макроскопические картины локализации пластического течения в металлах и сплавах с ГЦК-, ОЦК-и ГПУ-кристаллическими решетками. Установлено, что пластическая деформация во всех случаях протекает локализовано на всем протяжении процесса деформирования. Тип наблюдаемых картин локализации определяется законом деформа-ционного упрочнения, действующим на соответствующей стадии процес-са. Показано, что картины макролокализации пластического течения имеют автоволновой характер. Прослежена эволюция картин локализа-ции вдоль кривой пластического течения в исследованных материалах. Рассмотрена кинетика развития локализации пластического течения на стадии предразрушения.Досліджено макроскопічні картини льокалізації пластичної течії в мета-лах і стопах із ГЦК-, ОЦК-та ГЩУ-кристалічними ґратницями. Встанов-лено, що пластична деформація у всіх випадках спливає льокалізовано на всьому перебігу процесу деформування. Тип спостережуваних картин льокалізації визначається законом деформаційного зміцнення, що діє на відповідній стадії процесу. Показано, що картини макрольокалізації пла-стичної течії мають автохвильовий характер. Простежено еволюцію кар-тин льокалізації уздовж кривої пластичної течії в досліджених матерія-лах. Розглянуто кінетику розвитку льокалізації пластичної течії на ста-дії, що передує руйнуванню.Macroscopic patterns of localized plastic flow are investigated in f.c.c., b.c.c. and h.c.p. metals and alloys. As shown, the plastic deformation is developed as localized one during all stages of the plastic flow. The type of observed patterns of localization is governed by the work-hardening law acting at the corresponding stage of a process. As shown, the macrolocalized plastic-flow patterns are of autowave behaviour. The evolution of localization pattern is retraced along the plastic-flow curve in the materials under investigation. The Успехи физ. мет. / Usp. Fiz. Met. 2008, т. 9, сс. 371-422 Îòòèñêè äîñòóïíû íåïîñðåäñòâåííî îò èçäàòåëÿ Ôîòîêîïèðîâàíèå ðàçðåøåíî òîëüêî â ñîîòâåòñòâèè ñ ëèöåíçèåé 2008 ÈÌÔ (Èíñòèòóò ìåòàëëîôèçèêè èì. Ã. Â. Êóðäþìîâà ÍÀÍ Óêðàèíû) Íàïå÷àòàíî â Óêðàèíå.

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The relationship between plastic flow macrolocalization and a dislocation structure

Cited by 4 publications

References 3 publications

Special features of the localized plastic deformation and fracture of high-chromium steel of the martensitic class

Special features of the localized plastic deformation and fracture of high-chromium steel of the martensitic class

Plastic Deformation Macrolocalization. Local Stresses and Fracture in Ultrafine Grain Titanium

Macrolocalization of Plastic Deformation and Staging of Plastic Flow in Polycrystalline Metals and Alloys

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