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 ωh of the elastic hysteresis by ∼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 ω 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 ∼2.5) in ω 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.
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Original Russian Text © B.G. Mytsyk, Ya.P. Kost’, B.I. Turko, G.I. Gas’kevich, 2015, published in Fizika Tverdogo Tela, 2015, Vol. 57, No. 8, pp. 1539–1543.
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Mytsyk, B.G., Kost’, Y.P., Turko, B.I. et al. Mechanical properties of steel 20 at small deformations. Phys. Solid State 57, 1569–1573 (2015). https://doi.org/10.1134/S106378341508020X
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DOI: https://doi.org/10.1134/S106378341508020X