Localization of macrodeformation in submicrocrystalline titanium

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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“…As was shown in [4][5][6], the kinetics of the localized-strain centers in the prefracture stage governs the entire tough-fracture process.…”

Section: Introductionmentioning

confidence: 90%

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 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]. The distribution of meso-folds is matched by the distribution of localized deformation nuclei observed on the macro-scale level.…”

Section: Discussion Of Resultsmentioning

confidence: 86%

“…It is found that the localized plasticity patterns emergent in nanocrystalline materials are in a way quite distinct from those of ultrafine grain materials [4][5][6]. Thus no phase waves will form in ultrafine grain titanium and aluminum; at the same time, the collapse of autowave will manifest itself clearly at the pre-fracture stage and will persist for a prolonged period.…”

Section: Introductionmentioning

confidence: 94%

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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“…Ruptures are shallow defects that originate in billets after cold and hot deformation of metal (forging, stamping, stretching with large deformation) [11].…”

Section: Technological Defectsmentioning

confidence: 99%