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The tensile test of steel samples within the stress range lower than the yield strength showed that, in a hydrogen gas medium, creep is developed, which is delayed with time and becomes completely reversible with the removal of a medium. It is found that the rate of reversible creep is controlled by the transport of hydrogen gas through structural defects into incipient subcritical cracks formed upon the action of stresses.
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Merab Lordkipanidze (2006) studied this question.
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