期刊
SCRIPTA MATERIALIA
卷 223, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.115076
关键词
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The experimental lengthening kinetics of bainitic ferrite in steels have been consistently found to be slower than those predicted by the diffusional Zener-Hillert model. To reconcile the experimental and calculated kinetics, a 'barrier energy' with a clear physical meaning has been introduced. A modified diffusional growth model, based on the Zener-Hillert model, incorporates a physics-based barrier energy, taking into account interfacial disconnections motion and their interaction with defects in the matrix. The model successfully describes the C-curve growth rate of Widmansta & BULL;tten ferrite and bainitic ferrite in a wide range of steels.
The experimental lengthening kinetics of bainitic ferrite in steels have been consistently shown in the literature to be slower than those predicted using the diffusional Zener-Hillert model. Reconciliation of the experimental and calculated kinetics has required the introduction of a 'barrier energy' which until now has not had a clear physical meaning. A modified diffusional growth model based on the Zener-Hillert model for plate-like ferrite growth is introduced with a physics-based barrier energy. The model assumes diffusion controlled growth and takes into account a barrier energy arising from interfacial disconnections motion and their interaction with defects in the matrix. The model is able to successfully describe the C-curve growth rate of Widmansta & BULL;tten ferrite and bainitic ferrite in a wide range of steels.
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