Hydrogen degradation of steel 12H1MF and its estimation by the acoustic emission method

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Hydrogen degradation of steel 12H1MF and its estimation by the acoustic emission method

Skalskii, V.R. / Rudavskii, D.V. / Selivonchik, T.V.

Though a great number of various studies of different phenomena of the effect of hydrogen on properties of structural materials have been performed, this problem is still very important. This is first of all due to the development of hydrogen technologies and a hydrogen power industry. They should supply mankind with new alternative forms of power and reduce pollution of the environment. However, an obstacle for wide implementation of these technologies might be the inability to predict hydrogen degradation of structural materials, in particular, steels. This degradation causes mostly brittle fracture in the components of structures under the effect of a hydrogen-mechanical factor. The acoustic emission method for estimating damage to specimens made of thermally resistant steel is described as applied in air and in a gaseous hydrogen medium. Acoustic diagrams (AD) of steel cracking and their interpretation are presented. It is shown that thermal cycling of the steel in air and in a hydrogen medium leads to an increase in bulk damage to the steel. It is shown that the exploited material is more subject to micro- and macrocracking under the influence of temperature and the working environment.