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The effect of hydrogen environment on the properties of the iron-, titanium- and nickel-based construction materials

Work number - M 34 AWARDED

Presented G.V.Kurduvov Institut for Metal Phisics

S.M. Teus

The research is devoted to the study of hydrogen embrittlement phenomena in construction materials based on transition metals. Using a variety of modern theoretical and experimental methods the peculiarities of hydrogen effect on the electron structure, phase transformations and dislocation properties of iron-, titanium- and nickel-based alloys have been analyzed and, particularly, the consequences of such effects on the macroscopic mechanical properties of construction materials.

Using nitrogen and carbon as indicators of correlations between electron structure and mechanical properties, the verification of electron concept of hydrogen enhanced localized plasticity has been performed. The proposed concept allows to take into account the chemical nature of interstitial elements and correctly predict their influence on dislocation properties that is the main aspect of hydrogen-caused brittleness model. An additional advantage of the proposed concept, in comparison with the model developed within the framework of continuum mechanics, is the possibility to propose practical recommendations for the increase in materials resistance to hydrogen brittleness.

By means of theoretical and experimental studies, it was shown that there is similar effect of hydrogen on the electron structure and dislocation properties in titanium- and nickel-based alloys, which is an additional confirmation of correctness of the electron approach to hydrogen-enhanced localized plasticity and shows a general character of this approach for hydrogen brittleness. Particularly, on this basis, the explanation is given for different appearance of hydrogen brittleness in b-titanium alloys and austenitic steels, which allows to use hydrogen as a temporary alloying element during technological treatment of b-titanium alloys in its single phase state, to provide their better deformational characteristics.

Number of publications: 23, including 22 papers (18 – in journals with impact factors). Total number of citations on author publications/h-index are: Web of Science – 111/6, Scopus– 134/7, Google Shcolar – 160/7. In addition 1 Ukrainian patent.