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Metallurgical Transactions A

, Volume 21, Issue 3, pp 767–797 | Cite as

Bainite in steels

  • H. K. D. H. Bhadeshia
  • J. W. Christian
Article

Abstract

The mechanism of the bainite transformation in steels is reviewed, beginning with a summary of the early research and finishing with an assessment of the transformation in the context of the other reactions which occur as austenite is cooled to temperatures where it is no longer the stable phase. The review includes a detailed account of the microstructure, chemistry, and crystallography of bainitic ferrite and of the variety of carbide precipitation reactions associated with the bainite transformation. This is followed by an assessment of the thermodynamic and kinetic characteristics of the reaction and by a consideration of the reverse transformation from bainite to austenite. It is argued that there are useful mechanistic distinctions to be made between the coherent growth of ferrite initially supersaturated with carbon (bainite), coherent growth of Widmanstätten ferrite under paraequilibrium conditions, and incoherent growth of ferrite under local equilibrium or paraequilibrium conditions. The nature of the so-called acicular ferrite is also discussed.

Keywords

Ferrite Austenite Martensite Metallurgical Transaction Cementite 
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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Copyright information

© The Metallurgical of Society of AIME 1990

Authors and Affiliations

  • H. K. D. H. Bhadeshia
    • 1
  • J. W. Christian
    • 2
  1. 1.Department of Materials Science and MetallurgyUniversity of CambridgeCambridgeUK
  2. 2.Department of Metallurgy and Science of MaterialsOxford UniversityOxfordUK

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