Residual Stress Analysis of Composite Tubes Used for Kraft Recovery Boilers

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Spiral weld overlay on carbon steel tube was evaluated as an alternative cladding

  Approach:
  • Determine residual stresses due to composite tube material, manufacturing, and service

  • Use results to develop and verify FEM models at room temperature

  • Employ the models to assess stress during boiler operation and to suggest alternative materials

Panel of tubes mounted for residual stress analysis (above)




  • Large tensil stresses were found, posing a serious problem for welding of tube panels
  • Post weld heat-treatment was shown to remove the tensile stresses and is essential for successfully welding into panels

Publications
  • X.-L. Wang, E. A. Payzant, B. Taljat, C. R. Hubbard, J. R. Keiser, M. J. Jirinec, Mat. Sci. Eng., A232, 31-38 (1997)


  • J.R. Keiser, B. Taljat, X.-L. Wang, P.J. Masiasz, C.R. Hubbard, R.W. Swindeman, D.L. Singbeil, and R. Prescott, "Analysis of Composite Tube Cracking in Recovery Boiler Floors," pp. 693-704 in Proc. of 1996 TAPPI Eng. Conf., TAPPI Press, Atlanta, Georgia (1996).

  • J.R. Keiser, B. Taljat, X.-L. Wang, R.W. Swindeman, P.J. Masiasz, C.L. Thomas, E.A. Payzant, D.L. Singbeil, and R. Prescott, "Analysis of Cracking in Coextrucded Recovery Boiler Floor Tubes," to appear in Proc. of 1997 TAPPI Eng. Conf., TAPPI Press, Atlanta, Georgia (1997).

Acknowledgement

This research was sponsored by the U.S. Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Industrial Technologies, Advanced Industrial Materials Program. Neutron diffraction measurements were made at the High Flux Isotope Reactor, operated with the support from U.S. Department of Energy, Office of Basic Energy Sciences.


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Acknowledgments

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