Effects of hydrogen influence on strained steel 1020

It is shown that the method of small stresses σ ∼0.1σy action on the metal created by the authors allows studying plasticity changes caused by the hydrogen action with high accuracy. The effects of elastic hysteresis amplitude ωh reduction under the action of several (n) hydrogenation cycles on non-strained samples and a significant (2.5 times) increase of ωh value after several hydrogenation cycles on strained samples have been detected. The effect of ωh(n) → const was also detected and on the basis of which it was concluded that the hydrogen harmful action was best observed during the first cycles of hydrogen action. It is shown that a giant increase of ωh over several months is a sign of unpredictable destruction of low carbon steel after hydrogen action.