Failure analysis of power plant boiler material

  • J. H. Ai
  • H. Y. Lin
  • Y. X. Qi
Peer Reviewed Articles

Abstract

The failure of a boiler operating at 540°C and 9.4 MPa was investigated by evaluation of material removed from the near-failure region and by thermodynamic analysis. A scanning Auger microprobe, scanning electron microscope, and THERMO-CALC thermodynamic software (Thermo-Calc Software, Stockholm) were used in the investigation. Results showed that the segregation of impurity elements (phosphorous, tin, and nitrogen) to grain boundaries and the in-service formation of thin carbide films and granular carbides (Cr,Fe)23C6 on the grain boundaries were important factors in the failure process.

Key words

boiler material failure analysis SAM THERMO-CALC software 

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References

  1. 1.
    Y.X. Qi: Anal. Chem., 1990, (12), p. 1125 (in Chinese).Google Scholar
  2. 2.
    J. Janovec, A. Vyrostkova, P. Sevc, J.S. Robinson, M. Svoboda, J. Krestankova, and H.J. Grabke: Acta Mater., 2003, 51(14), pp. 4025–32.CrossRefGoogle Scholar
  3. 3.
    M.A. Islam, M. Novovic, P. Bowen, and J.F. Knott: J. Mater. Eng. Perform., 2003, 12(3), pp. 244–48.CrossRefGoogle Scholar
  4. 4.
    N. Souami, D. Saidi, M. Negache, and A. Ati: J. Mater. Eng. Perform., 2003, 12(6), pp. 715–20.CrossRefGoogle Scholar
  5. 5.
    L. Li and R.W. Messler: Weld. J., 2002, 81(5), pp. 78S-84S.Google Scholar
  6. 6.
    A.M. Llyin, I.L. Tazhibaeva, and B.A. Borisov: J. Nucl. Mater., 2002, (307), pp. 475–78.Google Scholar
  7. 7.
    P.E.J. Flewitt, R. Moskovic, and R.K. Wild: Surf. Interface Anal., 2002, 33(9), pp. 729–34.CrossRefGoogle Scholar
  8. 8.
    G. Barkleit, A. John, and F. Schneider: Mater. Corros., 1999, 50(10), pp. 591–95.CrossRefGoogle Scholar
  9. 9.
    P.R. Rao: Curr. Sci. India, 1997, 73(7), pp. 580–92.Google Scholar
  10. 10.
    K.F. Ha: Micro-theory of Metal Mechanical Properties, Science Press (Beijing), 1983, p. 42.Google Scholar
  11. 11.
    Z.X. Wang, X.L. Deng, and Y.X. Qi: Power Eng., 1992, (1), p. 32 (in Chinese).Google Scholar
  12. 12.
    Y.X. Qi, Z.W. Wang, and X.L. Deng: Vacuum, 1995, (4), p. 279.Google Scholar

Copyright information

© ASM International 2004

Authors and Affiliations

  • J. H. Ai
    • 1
  • H. Y. Lin
    • 2
  • Y. X. Qi
    • 3
  1. 1.School of Materials Science & EngineeringUniversity of Science & Technology BeijingP.R. China
  2. 2.Tianjin Institute of Power ScienceTianjinP.R. China
  3. 3.Failure Analysis Institution of China Mechanic Engineering SocietyBeijingP.R. China

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