Abstract
Carbide precipitation from the steel matrix during long-term high-temperature exposure can adversely affect the fracture toughness and high-temperature creep resistance of materials with implications on the performance of power plant components. In the present work, carbide evolution in 2.25Cr-1Mo steel after long-term aging during service was investigated. Boiler pipe samples of this steel were removed from a supercritical water-cooled coal-fired power plant after service times of 17 and 28 years and a mean operational temperature of 810 K (537 °C). The carbide precipitation and coarsening effects were studied using the carbon extraction replica technique followed by analysis using transmission electron microscopy and energy dispersive X-ray spectroscopy. The carbides extracted using an electrolytic technique were also analyzed using X-ray diffraction to evaluate phase transformations of the carbides during long-term service. Small ball punch and Vickers hardness were used to evaluate the changes in mechanical performance after long-term aging during service.
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Notes
LECO is a trademark of LECO Corporation, St. Joseph, MI.
PHILIPS is a trademark of FEI Company, Hillsboro, OR.
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Manuscript submitted June 27, 2007.
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Yang, Y., Chen, Y., Sridharan, K. et al. Evolution of Carbide Precipitates in 2.25Cr-1Mo Steel during Long-Term Service in a Power Plant. Metall Mater Trans A 41, 1441–1447 (2010). https://doi.org/10.1007/s11661-010-0194-6
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DOI: https://doi.org/10.1007/s11661-010-0194-6