Abstract
The features of deformation and fracture under static and cyclic tension of quenched steel 50 (0.51 wt. % C) subjected to strain-heat nanostructuring treatment are investigated. It is established that the combined nanostructuring treatment (which includes frictional treatment and tempering at 350 °С) changes the character of plastic flow under loading and makes the flow more uniform. This reveals itself in the disappearance of the yield plateau in the stress-strain diagram at the initial stage of deformation under static tension and in the suppression of the deformation relief caused by the effect of shear and rotational deformation modes in the material under cyclic tension. Despite cracking, the hardened surface layer of steel 50 fractures incompletely throughout the process of cyclic loading and retains its high ability to resist mechanical contact, which is indicated by the kinetic microindentation data.
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