This article is cited in 1 paper

Mechanical properties, strength physics and plasticity

Mechanical properties of steel 20 at small deformations

B. G. Mytsyk^a, Ya. P. Kost'^a, B. I. Turko^b, G. I. Gas'kevich<sup>a

a</sup> G. V. Karpenko Physical-Mechanical Institute of the National Academy of Sciences of Ukraine
^b Ivan Franko National University of L'viv

Abstract: The elastic hysteresis and residual deflections of samples made of steel 20, which correspond to the model of a thin rigid round plate pinched over the contour, have been investigated. It has been shown that annealing of the samples at 470 and 670 K weakly affects these characteristics, while after complete annealing (1170 K), the aging of steel 20 for three days is accompanied by a decrease in amplitude $\omega_h$ of the elastic hysteresis by $\sim$ 20%. A postulate that there is no elasticity limit of metals, below which residual deformation would be absent, has been confirmed experimentally. It has been shown that, based on the values of $\omega_h$, the ultimate strength of metals can be estimated acting on the samples by stresses smaller than the yield stress by an order of magnitude. A giant increase (by a factor of $\sim$ 2.5) in $\omega_h$ has been found after a prolonged (for 2 months) aging of steel 20 after the diffusion of hydrogen from it, which indicates the corresponding decrease in its cyclic longevity.

Received: 19.02.2015

 English version: Physics of the Solid State, 2015, 57:8, 1569–1573

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