Formation of "carbide-free zones" resulting from the interplay of C redistribution and carbide precipitation during bainitic transformation

Research output: Contribution to journalArticleResearchpeer-review

Authors

  • Thomas Klein
  • Marina Lukas
  • Tomasz Wojcik
  • Matthew Galler
  • Gerald Ressel

Organisational units

External Organisational units

  • Materials Center Leoben Forschungs GmbH
  • Institute of Materials Science and Technology
  • voestalpine Wire Rod Austria GmbH, St. Peter Freienstein/Leoben

Abstract

Advanced bainitic steels exploit their constitution of a phase mixture of bainitic ferrite and retained austenite. The desired microstructures are usually adjusted via isothermal or continuous cooling treatments below the bainite-start-temperature. In the present work, we analyze the microstructural evolution during bainite formation in detail and we report on a novel mechanism for the formation of “carbide-free zones” in the close proximity of austenite. Carbides are formed in the interior of bainitic ferrite, which is isolated from surrounding austenite, while the depletion of C in the vicinity of austenite suppresses their formation.

Details

Original languageEnglish
Article number100380
JournalMaterialia
Volume7.2019
Issue numberSeptember
DOIs
Publication statusPublished - 23 Jun 2019