Conclusions
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1.
The tendency of steel toward hydrogen embrittlement is clearly characterized by the structure parameter, which has the sense of the probability of decohesion (loss of strength determined on specimens with a notch) of an infinitely dilute solid solution of hydrogen. The reciprocal, the index of hydrogen resistance, is proportional to the critical pressure of molecular hydrogen at the cracks.
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2.
The relationships of the "current" values of loss of strength of specimens with a notch to the corresponding hydrogen activities are constant and tend toward the value of the probability of decohesion (a value characterizing the resistance of the steel to the physicochemical action of hydrogen) of the steel with the given structure.
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3.
The limiting hydrogen concentrations in reversible and irreversible hydrogen embrittlement are the thermodynamic equivalents of the structure parameter of hydrogen resistance. Their relationship is expressed by the equations of decohesion, which made it possible for the first time to determine the values of the critical hydrogen concentrations in steels.
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4.
The critical (threshold) stresses for hydrogen sulfide cracking depend linearly upon the product of the hydrogen resistance and the yield strength of the steel.
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5.
The criterion of failure of constructional steels in hydrogen embrittlement may be represented in clear form through the probability of decohesion, the hydrogen activity, and the original crack resistance.
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Orenburg Polytechnic Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 7–11, August, 1985.
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Savchenkov, É.A. Resistance of constructional steel to fracture in hydrogen impregnation and hydrogen sulfide cracking. Met Sci Heat Treat 27, 562–568 (1985). https://doi.org/10.1007/BF00699350
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DOI: https://doi.org/10.1007/BF00699350