Effects of Solute Nb Atoms and Nb Precipitates on Isothermal Transformation Kinetics from Austenite to Ferrite - LW final.pdf (2.19 MB)
Effects of solute Nb atoms and Nb precipitates on isothermal transformation kinetics from austenite to ferrite
journal contribution
posted on 2016-07-26, 10:31 authored by Li Wang, Sally V. Parker, Andrew J. Rose, G.D. West, Rachel ThomsonRachel ThomsonNb is a very important micro-alloying element in low-carbon steels, for grain size refinement and precipitation strengthening, and even a low content of Nb can result in a significant effect on phase transformation kinetics from austenite to ferrite. Solute Nb atoms and Nb precipitates may have different effects on transformation behaviors, and these effects have not yet been fully characterized. This paper examines in detail the effects of solute Nb atoms and Nb precipitates on isothermal transformation kinetics from austenite to ferrite. The mechanisms of the effects have been analyzed using various microscopy techniques. Many solute Nb atoms were found to be segregated at the austenite/ferrite interface and apply a solute drag effect. It has been found that solute Nb atoms have a retardation effect on ferrite nucleation rate and ferrite grain growth rate. The particle pinning effect caused by Nb precipitates is much weaker than the solute drag effect.
Funding
The authors gratefully thank Tata Steel UK Limited and Loughborough University for funding this work.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Published in
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCEVolume
47AIssue
7Pages
3387 - 3396 (10)Citation
WANG, L. ... et al., 2016. Effects of solute Nb atoms and Nb precipitates on isothermal transformation kinetics from austenite to ferrite. Metallurgical and Materials Transactions A, 47 (7), pp.3387–3396Publisher
Springer (© The Minerals, Metals & Materials Society and ASM International 2016)Version
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2016-05-02Notes
The final publication is available at Springer via http://dx.doi.org/10.1007/s11661-016-3548-x.ISSN
1073-5623eISSN
1543-1940Publisher version
Language
- en