Academic Journal
Kinetic Modeling of Grain Boundary Cementite Evolution
| العنوان: | Kinetic Modeling of Grain Boundary Cementite Evolution |
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| المؤلفون: | Vogric, M., Kozeschnik, E., Svoboda, J., Führer, M., Kreyca, J., Wei, W., Povoden-Karadeniz, E. |
| المساهمون: | TU Wien |
| المصدر: | Metallurgical and Materials Transactions A ; volume 53, issue 10, page 3759-3773 ; ISSN 1073-5623 1543-1940 |
| بيانات النشر: | Springer Science and Business Media LLC |
| سنة النشر: | 2022 |
| الوصف: | Prediction of grain boundary cementite growth kinetics in hypereutectoid steels is necessary to control its thickness. It is a question of major industrial importance but has remained unresolved to date. This paper presents and compares two different and new modeling approaches. The first one relies on diffusion-based nucleation and growth of cementite precipitates using a modified SFFK model with short-circuit grain boundary diffusion and accounting for heterogeneous nucleation site energy during isothermal treatments and continuous cooling. It is compared to previously published simulations of diffusion-controlled reaction with moving phase boundaries and a similar simulation using the software Dictra. The second approach implies that cementite thickening is driven by the nucleation of ledges at the stepped austenite/cementite interface, controlled by a structure barrier to ledge formation previously assumed in the literature. [1] We suggest a semi-empirical formulation of this barrier to ledge nucleation during isothermal transformation. Both approaches lead to an excellent match to experimental data for an almost pure Fe–C system. This implies that modeling the stepped structure of the austenite/cementite interface is not imperative for simulation of thickening kinetics, but also that understanding the governing physics of ledge formation allows for a comprehensive description of secondary cementite formation. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1007/s11661-022-06784-1 |
| DOI: | 10.1007/s11661-022-06784-1.pdf |
| DOI: | 10.1007/s11661-022-06784-1/fulltext.html |
| الاتاحة: | http://dx.doi.org/10.1007/s11661-022-06784-1 https://link.springer.com/content/pdf/10.1007/s11661-022-06784-1.pdf https://link.springer.com/article/10.1007/s11661-022-06784-1/fulltext.html |
| Rights: | https://creativecommons.org/licenses/by/4.0 ; https://creativecommons.org/licenses/by/4.0 |
| رقم الانضمام: | edsbas.B3788938 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1007/s11661-022-06784-1 |
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