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- W2904214855 abstract "The mechanical properties of low-carbon (0.2% C) St. 20 steel with conventional and ultrafine-grained (UFG) structures have been studied. The UFG structure of 340-448 nm in grain size was prepared by the method of equal-channel angular pressing (ECAP) for different numbers of passes (N = 4, 8 and 12) and subsequent annealing at 400 and 450°C. The study included static tension, impact bending at room and lower temperatures, fatigue tests, and the examination of the development of plastic deformation zones by replicas. It was established that an increase in the number of ECAP passes increases strength, but decreases plasticity and impact toughness, decreases strain hardening coefficient, and increases yield strength to the level of ultimate tensile strength. The ECAP for 8 passes leads to an increase in fatigue strength by 25%. Annealing does not substantially change mechanical properties. The optimum set of properties is characteristic of the steel after ECAP for 8 passes and annealing at 400°C. The shear instability revealed in the UFG steel upon static loading as the formation of a network of localized deformation bands inclined at an angle of ~ 55° to the loading axis of the specimen depends on the number of passes." @default.
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- W2904214855 date "2018-11-01" @default.
- W2904214855 modified "2023-10-18" @default.
- W2904214855 title "Mechanical behaviour of the St. 20 Steel after equal chanel angular pressing" @default.
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- W2904214855 doi "https://doi.org/10.1088/1742-6596/1134/1/012064" @default.
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