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Surface Modifications of Zirconium Alloys by Laser Glazing

  • K. F. Amouzouvi
  • L. J. Clegg
  • R. C. Styles

Abstract

Surface modification of Zr-2.5Nb and Zircaloy-2 materials by laser glazing has been studied. The effects of laser glazing parameters and conditions on the surface contamination and surface finish, the microstructure, the microhardness and the tensile properties have been characterized using light microscopy, scanning Auger microscopy, transmission and scanning electron microscopy, and microhardness and tensile tests. A smooth surface finish, free of contamination, could be produced if the laser glazing was performed at high scan rates (i.e., 1.92 m/s traverse speed) in a protective atmosphere of argon, with helium as a cover gas. The resulting microstructure was found to consist of a uniform, fine, α′ HCP martensite in both Zr-2.5Nb and Zircaloy-2 alloys, although very fine intermetallic particles could be observed in the Zircaloy-2. Post-glaze ageing resulted in precipitation of very fine ellipsoidal particles of Nb-rich β-phase particles in the Zr-2.5Nb and in finer and additional intermetallic particles in the Zircaloy-2. Based on these results, the potential of laser glazing to improve the corrosion resistance of Zr-2.5Nb and Zircaloy-2 pressure tube materials is discussed. Laser glazing is expected to improve the corrosion resistance of Zircaloy-2 material, while Zr-2.5Nb will require post-glaze ageing before optimum corrosion resistance is achieved.

Keywords

Traverse Speed Intermetallic Particle Transmission Electron Microscopy Examination Improve Corrosion Resistance Scan Auger Microscopy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Cox, B. J. Electrochem. Soc. 1961, 24, 24–30.CrossRefGoogle Scholar
  2. 2.
    Urbanic, V.F., Lesurf, J.E. and Johnson Jr., A.B. Corrosion, 1975, 31, 15–20.CrossRefGoogle Scholar
  3. 3.
    Lesurf, J.E. In Applications-Related Phenomena in Zirconium and its Alloys: Proc., ASTM STP 458, 1968, pp. 286–300.Google Scholar
  4. 4.
    Anthony, T.R. and Cline, H.E. US Patent 4,294,631 (1981).Google Scholar
  5. 5.
    Sabol, G.P., McDonald, S.G., Nurminen, J.I. and Jacobsen, W.A. In Zirconium in the Nuclear Industry, Proc Seventh Int. Symp., eds., R.B. Adamson and L.F.P. Van Swam, ASTM STP 939, 1987, pp. 168–186.CrossRefGoogle Scholar
  6. 6.
    Breinan, E.M., Kear, B.H. and Banas, C.M. Physics Today, 1976, 29(11), 44–50.CrossRefGoogle Scholar
  7. 7.
    Snow, D.B. and Breinan, E.M. In Applications of Lasers in Materials Processing, proceedings of ASM Conference, Metals Park, 1979, pp. 229–243.Google Scholar
  8. 8.
    Anthony, T.R. and Cline, H.E. J. App. Phys. 1977, 48(9) 3888–3894.CrossRefGoogle Scholar
  9. 9.
    Banerjee, S. and Krishnan, R. Acta Met., 1971, 19, 1317–1336.CrossRefGoogle Scholar
  10. 10.
    Anderson, T. and Vesterlund, G. In Zirconium in the Nuclear Industry, Proc. Fifth Int. Conf. ed., D.G. Franklin, ASTM STP 754, 1982, pp. 75–95.CrossRefGoogle Scholar
  11. 11.
    Thomas, D.E. In Metallurgy of Zirconium, eds, B. Lustman and F. Kerze, Jr., McGraw-Hill, New York, 1955.Google Scholar
  12. 12.
    Kass, S., Grozier, J.D. and Shubert, F.L. Corrosion, 1964, 20, 350t–360t.CrossRefGoogle Scholar
  13. 13.
    Urbanic, V.F. and Gilbert, R.W. Presented at IAEA Technical Committee Meeting on Fundamental Aspects of Corrosion of Zirconium-Based Alloys for Water Reactor Environments, Portland, Oregon, 11–19 September 1989.Google Scholar
  14. 14.
    Klepfer, H.H. J. Nucl. Mat., 1963, 9, 65–76.CrossRefGoogle Scholar
  15. 15.
    Williams, C.D. and Ells, C.E. Phil. Mag., 1968, 18, 763–772.CrossRefGoogle Scholar
  16. 16.
    Cox, B. Atomic Energy of Canada Limited Report, AECL-5610, 1976.Google Scholar
  17. 17.
    Dawson, J.K., Long, G., Seddon, W.E. and White, J.F. J. Nucl. Mat., 1968, 25, 179–200.CrossRefGoogle Scholar
  18. 18.
    Bradhurst, D.H. and Heuer, P.M. J. Nucl. Mat., 1970, 37, 35–47.CrossRefGoogle Scholar
  19. 19.
    Ahmed, J. and Keys, L.H. J. Less-Common Metals, 1975, 39, 99–107.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1990

Authors and Affiliations

  • K. F. Amouzouvi
    • 1
  • L. J. Clegg
    • 1
  • R. C. Styles
    • 1
  1. 1.Whiteshell Nuclear Research EstablishmentPinawaCanada

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