Effects of Solute Nb Atoms and Nb Precipitates on Isothermal Transformation Kinetics from Austenite to Ferrite

被引：0
|
作者：
Li Wang
Sally Parker
Andrew Rose
Geoff West
Rachel Thomson
机构：
[1] Loughborough University,Department of Materials
[2] Jaguar Land Rover,Materials Design Department, Tata Steel R&D
[3] Swinden Technology Centre,undefined
[4] University of Warwick,undefined
来源：
Metallurgical and Materials Transactions A | 2016年 / 47卷
关键词：
Ferrite; Austenite; Transformation Kinetic; Isothermal Transformation; High Angle Annular Dark Field;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Nb 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.
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页码：3387 / 3396
页数：9
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