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- W4312986122 abstract "The kinetics of accumulation of microcracks and fracture at various stages of tension of grade 20 steel specimens with coarse-grained and ultrafine-grained (UFG) structure obtained by the equal-channel angular pressing (ECAP) has been studied. To study the effect of mechanical degradation, a part of the samples was subjected to preliminary cycling to a relative lifetime of 50 %, followed by tensile tests, during which the parameters of acoustic emission, deformation fields obtained by digital image correlation were evaluated, and the intensity of the residual magnetic field was measured. The length and density of surface microcracks were measured by optical microscopy using computer image analysis. It is established that pre-cycling causes hardening of the material and a decrease in its plasticity. The fracture stages were revealed, and fatigue crack origins were found on the internal delaminations of specimens with a UFG structure after preliminary cyclic loading. It is shown that the formation of the UFG structure after the ECAP of specimens made of grade 20 steel leads to hardening, reduction of the fracture work, the area of the plastic zone, maximum major deformations and damage, as well as to an increase in the number of AE signals and the intesity of the residual magnetic field." @default.
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- W4312986122 date "2022-01-01" @default.
- W4312986122 modified "2023-09-26" @default.
- W4312986122 title "Damage kinetics of pre-cycled low-carbon steel with coarse-grained and ultrafine-grained structure" @default.
- W4312986122 doi "https://doi.org/10.30791/0015-3214-2022-4-54-65" @default.
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