Analysis of the development of damage in a welded junction in the hot intermediate superheat steam duct of 800-MW generator units |
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Authors: | E. A. Grin’ A. E. Anokhov |
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Affiliation: | (1) JSC “All-Russian Thermotechnical Institute” (VTI), Moscow, Russia |
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Abstract: | Data from a metallographic study of a damaged weld junction in a hot intermediate superheat steam duct and a computational model for crack development (in the damaged zone) by a creep mechanism are described. Anumerical calculation confirms the possibility of crack development to the known final size over a time of approximately 15,000 h, which corresponds to the operating time for the steam duct from the last time it was inspected until the time of a through fault, under conditions such that a 2.5-mm-deep surface crack (with a length of ∼50 mm along the surface) had been overlooked during this last inspection. Translated from élektricheskie Stantsii, No. 10, October 2008, pp. 29–35. |
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Keywords: | welded junction steam duct damage stress crack creep stability |
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