Abstract
We study the standard tensile mechanical properties of a live-steam pipeline operated for about 2 · 105 h and model (repair) welded joints. As a result of the degradation of weld metal under service conditions, its strength becomes lower than that of base metal. We show that the unregulated orientation of specimens along the axis of a welded joint is the most acceptable for detecting the degradation of weld metal. Cathode polarization facilitates evaluating the state of the degraded weld metal and that of the base metal. We have also disclosed the specific features of the influence of internal (preliminary hydrogenation) and external (electrolytic hydrogenation in the course of tests) hydrogen on the properties and mechanisms of the fracture of weld metal.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 42, No. 4, pp. 26–35, July–August, 2006.
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Student, O.Z., Markov, A.D. & Nykyforchyn, H.M. Specific features of the influence of hydrogen on the properties and mechanism of fracture of the metal of welded joints of steam pipelines at thermal power plants. Mater Sci 42, 451–460 (2006). https://doi.org/10.1007/s11003-006-0100-y
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DOI: https://doi.org/10.1007/s11003-006-0100-y