Influence of the Bulk Concentration of Hydrogen in the Metal on the Specific Features of Deformation of Low-Alloy Pipe Steel

Improvement of the Mechanical Characteristics, Hydrogen Crack Resistance and Durability of Turbine Rotor Steels Welded Joints

“…All of this also negatively affects the performance of machine parts under cyclic and static loads during long-term operation. Uneven grain sizes, the sizes and distribution of reinforcing phases, local thermal stresses and other defects cause the significant sensitivity of various structural elements of welded joints to the action of hydrogen [41][42][43][44][45][46]. Even the simulation of the soldering regime with the short-term (15 min) heating of KhN43MBTYu and 05Cr19Ni55 alloys to 1473 K leads to an increase in grain size and the concentration of large grain boundary Uneven grain sizes, the sizes and distribution of reinforcing phases, local thermal stresses and other defects cause the significant sensitivity of various structural elements of welded joints to the action of hydrogen [41][42][43][44][45][46].…”

“…Uneven grain sizes, the sizes and distribution of reinforcing phases, local thermal stresses and other defects cause the significant sensitivity of various structural elements of welded joints to the action of hydrogen [41][42][43][44][45][46]. Even the simulation of the soldering regime with the short-term (15 min) heating of KhN43MBTYu and 05Cr19Ni55 alloys to 1473 K leads to an increase in grain size and the concentration of large grain boundary Uneven grain sizes, the sizes and distribution of reinforcing phases, local thermal stresses and other defects cause the significant sensitivity of various structural elements of welded joints to the action of hydrogen [41][42][43][44][45][46]. Even the simulation of the soldering regime with the short-term (15 min) heating of KhN43MBTYu and 05Cr19Ni55 alloys to 1473 K leads to an increase in grain size and the concentration of large grain boundary intermetallic precipitates, which significantly enhances the hydrogen embrittlement of materials [47,48].…”

“…Important characteristics of critical structures, including steam and hydrogen turbine rotors, are the parameters of crack resistance , which are also significantly reduced by hydrogen [41,42,[46][47][48][53][54][55][56] with a pressure up to 10 MPa. Given the variety of factors that determine the properties of welded elements in hydrogen-containing environments, to assess their performance requires the experimental determination of a set of physical and mechanical properties of a particular joint [119][120][121][122][123][124][125], especially for the structural elements of the hydrogen energy buffer (electrolizers, fuel cells, hydrogen storage and grid distribution), with the intention of utilizing hydrogen and the accompanied phenomenon of their hydrogen degradation during long-term service.…”

Mechanical properties of steel 20 at small deformations

“…In this con nection, an important question appears on stability of cyclic longevity of steel 20 at such temperatures in hydrogen containing media, when hydrogen is actively incorporated into metal, which is accompa nied by substantial worsening of its mechanical char acteristics (the influence of such media on metals is intensely studied in the recent time, see, for example, [14][15][16][17]). Let us list first results on the influence of hydrogen on steel 20.…”