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Phase-field simulation of abnormal grain growth during carburization in Nb-added steel
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| Title: | Phase-field simulation of abnormal grain growth during carburization in Nb-added steel |
| Authors: | Kinoshita, Takahisa Browse this author | | Ohno, Munekazu Browse this author →KAKEN DB |
| Keywords: | Phase-field model | | Carburization | | Abnormal grain growth | | Pinning effect | | Mean-field approximation |
| Issue Date: | May-2020 |
| Publisher: | Elsevier |
| Journal Title: | Computational materials science |
| Volume: | 177 |
| Start Page: | 109558 |
| Publisher DOI: | 10.1016/j.commatsci.2020.109558 |
| Abstract: | Abnormal grain growth of austenite phase often takes place during carburization of steels, originating from carbon concentration dependence of pinning pressure of fine precipitates, the size of which is typically a few orders of magnitude smaller than the austenite grain size. In this study, the phase-field model for simulating the abnormal grain growth during carburization in steels is developed based on a mean field approximation in which the curvature-driven growth with the pinning pressure due to fine particles is reproduced by explicitly introducing the pinning pressure into the time evolution equations of order parameters. This model is applied to simulations of the austenite grain growth during carburization in Nb-added steels. Simulations are carried out to understand the occurrence of abnormal grain growth at different carburization temperatures for different steel compositions. In addition, an effect of non-uniform distribution of fine particles, which often appears as a consequence of microsegregation, on abnormal grain growth is investigated. |
| Rights: | ©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/84426 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 大野 宗一
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