Evolution of Carbide Precipitates in 2.25Cr-1Mo Steel during Long-Term Service in a Power Plant |
| |
Authors: | Yong Yang Yiren Chen Kumar Sridharan Todd R. Allen |
| |
Affiliation: | (1) Engineering Physics Department, University of Wisconsin–Madison, Madison, WI 53706, USA;(2) Argonne National Laboratory, Argonne, IL 60439, USA |
| |
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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|