Optimization of flow stress in cool deformed Nb-microalloyed steel by combining strain induced transformation of retained austenite, cooling rate and heat treatment

Download
  1. Get@NRC: Optimization of flow stress in cool deformed Nb-microalloyed steel by combining strain induced transformation of retained austenite, cooling rate and heat treatment (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/j.actamat.2011.11.019
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Journal titleActa Materialia
Volume60
Issue3
Pages12211229; # of pages: 9
SubjectCool deformation; Precipitation; Retained austenite; Strain-induced transformation; Neutron diffraction
AbstractIn this study cool deformation was incorporated in the overall thermo-mechanical processing of a Nb-microalloyed steel. Included in this was the effect of cooling rate subsequent to hot rolling on precipitate formation in the ferrite phase. The results show that increasing the cooling rate prevents precipitate formation in the ferrite phase at the cool deformation temperature. As well, the amount of retained austenite under the low cooling condition in the temperature range of cool deformation, 700–300 °C, was measured by neutron diffraction. It is then shown that strain-induced transformation of retained austenite to martensite is the main factor in increasing the strength of cool deformed Nb microalloyed steel. Combining accelerated cooling, strain-induced transformation of austenite to martensite during cool deformation and a subsequent heat treatment stage to increase precipitation maximizes the flow stress of the steel. Finally, it is shown that this process also lowers the yield strength/ultimate strength ratio.
Publication date
LanguageEnglish
AffiliationNRC Canadian Neutron Beam Centre; National Research Council Canada
Peer reviewedYes
NPARC number20140152
Export citationExport as RIS
Report a correctionReport a correction
Record identifierff0832b3-3ed2-45ac-98e6-18d2fd63ff7a
Record created2012-06-14
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)