Journal of Materials Science

, Volume 19, Issue 11, pp 3760–3766 | Cite as

Electron-beam rapid quenching of an ultra high-strength alloy steel

  • K. J. A. Mawella
  • R. W. K. Honeycombe
Papers

Abstract

Rapid quenching using electron beams has been used to treat the surface layers of an ultra high-strength alloy steel. The microstructure of the treated surface layers has been investigated by optical, scanning and electron microscopy and by X-ray diffractometry. The microstructure produced by conventional solid state quenching of the same steel has also been examined for comparison. This microstructural study shows that the rapid quenching process leads to a high degree of grain refinement and an increase in solid solubility which, in turn, increases the amount of retained austenite. The lowering ofM s temperature due to the high cooling rate and the increased solid solubility favour the formation of twinned martensite. These interlinked phenomena have increased the microhardness of the rapidly quenched layer considerably, with respect to that of the solid state quenched steel.

Keywords

Microstructure Austenite Surface Layer Martensite Solid State 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    K. J. A. Mawella, PhD thesis, University of Cambridge (1983).Google Scholar
  2. 2.
    H. Matyja, B. C. Giessen andN. J. Grant,J. Inst. Metals 96 (1968) 30.Google Scholar
  3. 3.
    K. J. A. Mawella, R. W. K. Honeycombe andP. R. Howell,J. Mater. Sci. 17 (1982) 2850.CrossRefGoogle Scholar
  4. 4.
    P. G. Boswell andG. A. Chad Wick,Scripta Metall. 11 (1967) 459.CrossRefGoogle Scholar
  5. 5.
    N. J. Petch,JISI (Lond.) 174 (1953) 25.Google Scholar
  6. 6.
    R. C. Ruhl andM. Cohen,Trans. Met. Soc. AIME. 245 (1969) 253.Google Scholar
  7. 7.
    Y. Inokuti andB. Cantor,Scripta Metall. 10 (1976) 655.CrossRefGoogle Scholar
  8. 8.
    G. Thomas,Met. Trans. 2 (1971) 2373.CrossRefGoogle Scholar
  9. 9.
    W. C. Leslie andR. L. Miller,Trans. ASM 57 (1964) 972.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1984

Authors and Affiliations

  • K. J. A. Mawella
    • 1
  • R. W. K. Honeycombe
    • 1
  1. 1.Department of Metallurgy and Materials ScienceUniversity of CambridgeCambridgeUK

Personalised recommendations