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1 2007

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Peculiarities of hydrogen effect on the creep process in the Cr-Ni-Mo steel

Zagórski A., Student O., Babij L., Nykyforchyn H., Kurzydłowski K.J.

Advances in Materials Science

2007

Vol. 7, nr 1(11)

211-218

Stability of the metal mechanical properties of oil hydrocracking reactor shell during long term exploitation is very important for guarantee of safe service. It is significant to investigate a metal after different duration of its service for prediction of work ability of material. The simultaneous effect of high temperature and hydrogen on an intensity of metal degradation is revealed. Besides, by comparison of creep strain Tales in air and hydrogen, is shown effect of hydrogenation on steady stale creep of metal in virgin stale and after service. In particular creep strain rate in virgin and degraded in service conditions steels is higher in hydrogen than in air. The mechanism of hydrogen effect is revealed. It is shown that tests in hydrogen make systems of sliding made active and it provides localization of creep process in the narrow strip and fracture macroorientation in direction of the tangent stresses action.