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Assessment of Creep Damage on a High Temperature Pipe Bend of 0.5Cr0.5Mo0.25V Ferritic Steel for Thermal Power Plant  

Hyun, Jung-Seob (Power Generation Research Laboratory, KEPRI)
Heo, Jae-Sil (Power Generation Research Laboratory, KEPRI)
Kim, Bong-Soo (Power Generation Research Laboratory, KEPRI)
Publication Information
Journal of the Korean Society for Precision Engineering / v.27, no.3, 2010 , pp. 127-134 More about this Journal
Abstract
Components in thermal power plants are subjected to service conditions under which creep damages take place causing material exhaustion. Comprehensive creep damage investigations have been performed on a 0.5Cr0.5Mo0.25V pipe bend which had been taken out of service after 117,603h and 501 start-ups because of severe cracks. The propagation of creep damage in a long term exposed pipe bend has been analysed by the replication, Indentation and hardness tests. Also, Calculation of creep lifetime has been investigated in order to verify actual lifetime of a damaged pipe bend. By measuring diametrical expansion, Accumulated creep strain and creep strain rate were calculated. Calculated results of creep lifetime on the Larson-Miller Parameter method are good agreement with actual service-exposed hour.
Keywords
Creep Damage; Microstructural Degradation; Creep Strain; Hardness; Creep Cavity;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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