Creep life evaluation of 2.25Cr-1Mo steel components and in-situ NDE by electrochemical technique
Book
·
OSTI ID:176112
- Tohoku Univ., Aramaki, Sendai (Japan)
Evolution of microstructure due to service exposure to high-temperature has a strong effect on performance of heat-resistant steels. In case of 2.25Cr-1Mo steels, precipitation and coarsening of M{sub 6}C-type carbides is the primary cause of degradation of the mechanical properties such as creep resistance, tensile strength and toughness. Creep tests have been carried out on pre-aged or service-exposed 2.25Cr-1Mo steels to examine the pre-aging effects on creep strength. Based on the results, a nondestructive procedure, where electrochemical method that quantitatively detect M{sub 6}C-type carbides in a material is used, has been proposed to evaluate a residual creep life of 2.25Cr-1Mo steels. Results of field application of the electrochemical method to residual life assessment of superheater tubes of a fossil power plant is also described.
- OSTI ID:
- 176112
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1346-0
- Country of Publication:
- United States
- Language:
- English
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