Abstract
We study the influence of chemical and phase composition on the cyclic crack-growth resistance of non-hydrogenated and hydrogenated welded joints in low-alloy steel at normal and low (−70°C) temperatures. It was discovered that the increase in the nickel content from 0.06% to 3.27% induces an increase in impact toughness and cyclic crack-growth resistance at low temperatures which can be explained by the increase in the content of needle ferrite and by the substitution of uniformly distributed residual austenite for the pearlitic component in the zone characterized by the columnar structure of heat treated beads. Hydrogen saturation of the weld metal leads to a decrease in its cyclic crack-growth resistance at normal temperatures and produces almost no effect on this parameter at low temperatures (−70°C). The presence of the second austenitic phase in the low-alloy weld metal decreases its susceptibility to hydrogen embrittlement in the case where finely divided austenite is uniformly distributed over the weld.
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Karpenko Physicomechanical Institute, Ukrainian Academy of Sciences, L'viv. Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 31, No. 2, pp. 62–68, March – April, 1995.
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Ostash, O.P., Zynyuk, O.D., Pokhodnya, I.K. et al. Low-temperature cyclic crack-growth resistance of hydrogenated welds. Mater Sci 31, 213–218 (1996). https://doi.org/10.1007/BF00558641
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DOI: https://doi.org/10.1007/BF00558641