Advertisement

Metallurgical and Materials Transactions B

, Volume 3, Issue 11, pp 2989–2997 | Cite as

The solidification sequence in an 18-8 stainless steel, investigated by directional solidification

  • H. Fredriksson
Transformations

Abstract

The directional solidification technique was applied in order to investigate the complicated solidification sequence in a commercial austenitic stainless steel which was known to yield a primary precipitation of § ferrite when cast into a 5 tons ingot. Three stages of solidification were found. The first precipitation of § ferrite was interrupted by precipitation of austenite and at the end of the solidification there was a transition back to precipitation of § ferrite. The competition between the first two stages is affected by the cooling rate and the nitrogen content. The precipitation of austenite from the melt results in the usual coring whereas ô ferrite forms with a very homogeneous composition, presumably due to rapid diffusion in this phase. On cooling austenite forms from the § ferrite and this reaction also results in coring, presumably due to rapid diffusion in § ferrite.

Keywords

Ferrite Austenite Metallurgical Transaction Metallurgical Transaction Volume Solidification Front 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    A. Hultgren:J. Iron Steel Inst., 1929, vol. 70, pp. 69–113.Google Scholar
  2. 2.
    H. Fredriksson and M. Hillert:Met. Trans., 1972, vol. 3, pp. 565–70.CrossRefGoogle Scholar
  3. 3.
    G. Nygren: Internal Report, Avesta Jernverk AB.Google Scholar
  4. 4.
    M. Beckert and H. Klemm:Hanbuch der Metallographischen Atzverfahren D.V.G., Leipzig, 1966.Google Scholar
  5. 5.
    E. Scheil:Z. Metallk, 1942, vol. 34, pp. 70–72.Google Scholar
  6. 6.
    H. Fredriksson:Scand. J. Met, 1972, vol. 1, pp. 3–7.Google Scholar
  7. 7.
    J. W. Pugh and J. D. Nisbet:J. Metals, 1950, vol. 188, pp. 268–76.Google Scholar

Copyright information

© The Metallurgical of Society of AIME 1972

Authors and Affiliations

  • H. Fredriksson
    • 1
  1. 1.Department of Physical MetallurgyRoyal Institute of TechnologyStockholmSweden

Personalised recommendations