Conclusions
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1.
Cracking occurs in tubular specimens of U8 steel hydrogenated to high hydrogen concentrations mainly because the gaseous hydrogen affects the steel.
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2.
Slow failure occurs by the formation and growth of defects of crack type, which cause the large-amplitude discrete AE signals alternating with continuous AE ones of relatively low amplitude.
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3.
Cracking is accentuated by increased pressure during the hydrogenation at a given temperature and by reduction in the cooling time.
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4.
High tensile steels saturated with hydrogen are liable to slow failure by the formation and growth of defects of crack type. The main periods in the failure are as follows: a) preparatory period, with plastic strain and corrosion due to the high temperatures and to the residual-stress and strain concentrations on cooling; b) the incubation period, when microcracks are formed at grain boundaries and nonmetallic inclusions; and c) subcritical growth period, where microcracks merge into macrocracks, which grow.
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5.
The cracks grow in steps equal to the sizes of the grains or a few grains, and the AE is due to intercrystallite cracking in the zone of stable crack growth in U8 steel.
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Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 28, No. 4, pp. 63–69, July–August, 1992.
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Andreikiv, A.E., Lysak, N.V., Skal'skii, V.R. et al. Acoustic-emission monitoring of hydrogen cracking in metals and alloys. Mater Sci 28, 378–382 (1992). https://doi.org/10.1007/BF00723217
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DOI: https://doi.org/10.1007/BF00723217