Metallurgical Transactions A

, Volume 16, Issue 1, pp 109–114 | Cite as

Microstructural changes in 1Cr-0.5Mo steel after 20 years of service

  • V. A. Bišs
  • T. Wada
Environmental Interaction
Received:

Abstract

Metallographie studies have been conducted on 1Cr-0.5Mo steel “taken from a pressure vessel which had been in service for 20 years in a hydrogenous environment at 524 °C. The original microstructure of the steel, reproduced by reheat treatment of the exposed material, consisted of proeutectoid ferrite and tempered bainite, the carbides being mainly cementite. The service exposure caused precipitation of needle-like M2C carbides in the ferritic regions and M7C3 carbides in the vicinity of the original cementite particles. Chromium and molybdenum moved from solid solution to the carbides during the service exposure with 72 pct and 32 pct of the total chromium and molybdenum contents, respectively, remaining in solid solution after service for 20 years.

Keywords

Carbide Metallurgical Transaction Cementite Bainite Extraction Replica 
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.
    T. Watanabeet al.: Elevated Temperature Tensile Strength of Cr-Mo Pressure Vessel Steels after Long-Term Service, ASME Publication MPC-18,Advanced Materials for Pressure Vessel Service with Hydro-gen at High Temperatures and Pressures, 1982, pp. 237-57.Google Scholar
  2. 2.
    T. Wacta and V. A. Bišs:Metall. Trans. A, 1983, vol. 14A, pp. 845–55.Google Scholar
  3. 3.
    K. Ikegami: unpublished data, Niigata Engineering Co. Ltd., 1-9-3 Kamata-Honcho, Ohta-ku, Tokyo, Japan, October 1981.Google Scholar
  4. 4.
    L. M.T. Hopkin and E. A. Jenkinson:J.I.S.I., 1964, vol. 202, pp. 929–32.Google Scholar
  5. 5.
    T. M. Cullen, I. A. Rohrig, and J. W. Freeman: Trans. ASME,J. of Basic Eng., 1966, vol. 88, series D, pp. 669–74.Google Scholar
  6. 6.
    J.J. Lander and L.H. Germer:Trans. AIME, 1948, vol. 175, pp. 648–89.Google Scholar
  7. 7.
    R.A. Swift:Welding J., 1971, vol. 50, pp. 195?s-200?s.Google Scholar
  8. 8.
    JCPDS Powder Diffraction Card (formerly ASTM Powder Diffraction Card) 15-457, published by JCPDS-International Centre for Diffrac-tion Data, 1601 Park Lane, Swarthmore, PA 19081, 1965.Google Scholar
  9. 9.
    R. G. Baker and J. Nutting:J.I.S.I., 1959, vol. 193, pp. 257–68.Google Scholar
  10. 10.
    D. J. Dyson and K.W. Andrews:J.I.S.I., 1964, vol. 202, pp. 325–29.Google Scholar
  11. 11.
    K.W. Andrews, H. Hughes, and D. J. Dyson:J.I.S.I., 1972, vol. 210, pp. 337–60.Google Scholar
  12. 12.
    F. K. Naumann, H. Keller, H. Kudielka, and A. Krisch:Arch. Eisenhw., 1971, vol. 43, pp. 439–47.Google Scholar
  13. 13.
    A. Afrouz, M.J. Collins, and R. Pilkington:Metals Technology, 1983, vol. 10, pp. 461–63.Google Scholar
  14. 14.
    S. Nagakura and S. Oketani:Trans. ISI Japan, 1968, vol. 8, pp. 265–94.Google Scholar

Copyright information

© The Metallurgical Society of American Institute of Mining 1985

Authors and Affiliations

  • V. A. Bišs
    • 1
  • T. Wada
    • 2
  1. 1.Howmet Technical CenterWhitehall
  2. 2.AMAX Materials Research CenterAnn Arbor

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