Metallurgical and Materials Transactions A

, Volume 41, Issue 6, pp 1441–1447 | Cite as

Evolution of Carbide Precipitates in 2.25Cr-1Mo Steel during Long-Term Service in a Power Plant

  • Yong Yang
  • Yiren Chen
  • Kumar Sridharan
  • Todd R. Allen
Article

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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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2010

Authors and Affiliations

  • Yong Yang
    • 1
  • Yiren Chen
    • 2
  • Kumar Sridharan
    • 1
  • Todd R. Allen
    • 1
  1. 1.Engineering Physics DepartmentUniversity of Wisconsin–MadisonMadisonUSA
  2. 2.Argonne National LaboratoryArgonneUSA

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