Evolution of non-uniform grain structure during hot defornnation of a Nb-Ti microalloyed steel
DOI:
https://doi.org/10.3989/revmetalm.2004.v40.i5.283Keywords:
Abnormal grain growth, reheating, recrystallisation, grain size, microalloyed steelAbstract
Recrystallisation and the evolution of the abnormally grown austenite grains were investigated for a continuously cast slab of a 0.13 C-1.41 Mn-0.027 Nb-0.012 Ti steel during reheating and after the subsequent deformation. The stability of the recrystallised structure and the uniformity of the final microstructure were also studied. The abnormally grown grains appear in a few minutes at reheating temperatures around 1200 °C. All grains in the bimodal grain structure recrystallised at 1100 °C for strains > 0.2 within about 40 s. The coarse grains are refined, while the fine grains become slightly larger. Some abnormal grain growth can occur again in the recrystallised structure within 10 min. After cooling at 1° C/s the coarse austenite grains transform into large areas of upper bainite, while the finer grains transform to fine ferrite and pearlite. The transformed microstructure in specimens cooled at l°C/s consists of large upper bainitic areas corresponding to the prior coarse austenite grains, surrounded by fine ferrite-pearlite grains.
Downloads
Download data is not yet available.
Downloads
Published
2004-10-30
How to Cite
Katajarinne, T., Somani, M., Karjalainen, P., & Porter, D. (2004). Evolution of non-uniform grain structure during hot defornnation of a Nb-Ti microalloyed steel. Revista De Metalurgia, 40(5), 329–334. https://doi.org/10.3989/revmetalm.2004.v40.i5.283
Issue
Section
Articles
License
Copyright (c) 2004 Consejo Superior de Investigaciones Científicas (CSIC)
This work is licensed under a Creative Commons Attribution 4.0 International License.
© CSIC. Manuscripts published in both the printed and online versions of this Journal are the property of Consejo Superior de Investigaciones Científicas, and quoting this source is a requirement for any partial or full reproduction.All contents of this electronic edition, except where otherwise noted, are distributed under a “Creative Commons Attribution 4.0 International” (CC BY 4.0) License. You may read here the basic information and the legal text of the license. The indication of the CC BY 4.0 License must be expressly stated in this way when necessary.
Self-archiving in repositories, personal webpages or similar, of any version other than the published by the Editor, is not allowed.