Verhandlungen pp 650-658 | Cite as

An electron microscope study of changes in a 2 1/4% Cr, 1% Mo super-heater tube steel during tempering and creep

  • K. F. Hale


Present day power plants require materials that can withstand stresses at elevated temperatures for times of the order of 100,000 hr. Naturally it would be highly desirable to predict the behaviour of these materials over long periods from tests of short duration. If the view is correct that creep strength is largely determined by the fine-scale microstructure this would be possible if similar changes take place at different temperatures. The present work was done in an attempt to test this hypothesis, changes in microstructure in fairly long tests at service temperatures being compared with those occurring during shorter tests at higher temperatures. It was considered that the application of electron microscopy might make such short duration tests feasible.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Smith, A. I., E. A. Jenkinson, D. J. Armstrong and M. F. Day: J/T 170. Electrical Res. Ass. 1957. Steels for use in steam power plant operating above 950° F. Creep, Stress-Relaxation and Metallurgical Properties. To be published in Trans. I. Mech. E.Google Scholar
  2. 2.
    Habraken, L.: Thése d’Agrégation d l’Enseignement Supérieur, Université de Liége 1953. Publie par Centre National Recherches Métallurgiques.Google Scholar
  3. 3.
    Schrader, A., A. Rose, L. Rademacher and W. Pitsch: Arch. Eisenhiittenwesen 28, 461 (1957).Google Scholar
  4. 4.
    Baker, R. G., and J. Nutting: B.I.S.R.A. Rep. Nos. MG/J/101/55 and MG/J/248/55.Google Scholar
  5. 5.
    Smith, E., and J. Nutting: B.I.S.R.A. Rep. No. MG/J/251/55.Google Scholar
  6. 6.
    Smith, E., and J. Nutting: Brit. J. appl. Physics 7, 214 (1956).ADSCrossRefGoogle Scholar
  7. 7.
    Goldschmidt, H. J.: Metallurgia 40, 103 (1949).Google Scholar
  8. 8.
    Zener, C.: Physic. Rev. 74, 639 (1948).ADSCrossRefzbMATHGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1960

Authors and Affiliations

  • K. F. Hale
    • 1
  1. 1.Metallurgy DivisionNational Physical LaboratoryTeddingtonEngland

Personalised recommendations