期刊
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
卷 24, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0965-0393/24/3/035016
关键词
niobium; transformation kinetics; nucleation rate; solute drag effect; low carbon steels
资金
- Tata Steel UK Limited
- Loughborough University
In this paper, a new model has been developed to predict the phase transformation behaviours from austenite to ferrite in Nb-containing low carbon steels. The new model is based on some previous work and incorporates the effects of Nb on phase transformation behaviours, in order to make it applicable for Nb-containing steels. Dissolved Nb atoms segregated at prior austenite grain boundaries increase the critical energy for ferrite nucleation, and thus the ferrite nucleation rate is decreased. Dissolved Nb atoms also apply a solute drag effect to the moving transformation interface, and the ferrite grain growth rate is also decreased. The overall transformation kinetics is then calculated according to the classic Johnson-Mehl-Avrami-Kolmogorov (JMAK) theory. The new model predictions are quite consistent with experimental results for various steels during isothermal transformations or continuous cooling.
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