Cargando…
Study of Grain Growth in a Ni-Based Superalloy by Experiments and Cellular Automaton Model
The grain growth behavior in a typical Ni-based superalloy was investigated using isothermal heat treatment experiments over a holding temperature range of 1353–1473 K. The experimental results showed that the grain structure continuously coarsened as the holding time and holding temperature increas...
Autores principales: | , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8621609/ https://www.ncbi.nlm.nih.gov/pubmed/34832322 http://dx.doi.org/10.3390/ma14226922 |
_version_ | 1784605501304078336 |
---|---|
author | Liu, Yan-Xing Ke, Zhi-Jiang Li, Run-Hua Song, Ju-Qing Ruan, Jing-Jing |
author_facet | Liu, Yan-Xing Ke, Zhi-Jiang Li, Run-Hua Song, Ju-Qing Ruan, Jing-Jing |
author_sort | Liu, Yan-Xing |
collection | PubMed |
description | The grain growth behavior in a typical Ni-based superalloy was investigated using isothermal heat treatment experiments over a holding temperature range of 1353–1473 K. The experimental results showed that the grain structure continuously coarsened as the holding time and holding temperature increased during heat treatment. A classical parabolic grain growth model was used to explore the mechanism of grain growth under experimental conditions. The grain growth exponent was found to be slightly above 2. This indicates that the current grain growth in the studied superalloy is mainly governed by grain boundary migration with a minor pinning effect from the precipitates. Then, the grain growth in the studied superalloy during isothermal heat treatment was modelled by a cellular automaton (CA) with deterministic state switch rules. The microscale kinetics of grain growth is described by the correlation between the moving velocity and curvature of the grain boundary. The local grain boundary curvature is well evaluated by a template disk method. The grain boundary mobility was found to increase with increasing temperature. The relationship between the grain boundary mobility and temperature has been established. The developed CA model is capable of capturing the dependence of the grain size on the holding time under different holding temperatures. |
format | Online Article Text |
id | pubmed-8621609 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-86216092021-11-27 Study of Grain Growth in a Ni-Based Superalloy by Experiments and Cellular Automaton Model Liu, Yan-Xing Ke, Zhi-Jiang Li, Run-Hua Song, Ju-Qing Ruan, Jing-Jing Materials (Basel) Article The grain growth behavior in a typical Ni-based superalloy was investigated using isothermal heat treatment experiments over a holding temperature range of 1353–1473 K. The experimental results showed that the grain structure continuously coarsened as the holding time and holding temperature increased during heat treatment. A classical parabolic grain growth model was used to explore the mechanism of grain growth under experimental conditions. The grain growth exponent was found to be slightly above 2. This indicates that the current grain growth in the studied superalloy is mainly governed by grain boundary migration with a minor pinning effect from the precipitates. Then, the grain growth in the studied superalloy during isothermal heat treatment was modelled by a cellular automaton (CA) with deterministic state switch rules. The microscale kinetics of grain growth is described by the correlation between the moving velocity and curvature of the grain boundary. The local grain boundary curvature is well evaluated by a template disk method. The grain boundary mobility was found to increase with increasing temperature. The relationship between the grain boundary mobility and temperature has been established. The developed CA model is capable of capturing the dependence of the grain size on the holding time under different holding temperatures. MDPI 2021-11-16 /pmc/articles/PMC8621609/ /pubmed/34832322 http://dx.doi.org/10.3390/ma14226922 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Liu, Yan-Xing Ke, Zhi-Jiang Li, Run-Hua Song, Ju-Qing Ruan, Jing-Jing Study of Grain Growth in a Ni-Based Superalloy by Experiments and Cellular Automaton Model |
title | Study of Grain Growth in a Ni-Based Superalloy by Experiments and Cellular Automaton Model |
title_full | Study of Grain Growth in a Ni-Based Superalloy by Experiments and Cellular Automaton Model |
title_fullStr | Study of Grain Growth in a Ni-Based Superalloy by Experiments and Cellular Automaton Model |
title_full_unstemmed | Study of Grain Growth in a Ni-Based Superalloy by Experiments and Cellular Automaton Model |
title_short | Study of Grain Growth in a Ni-Based Superalloy by Experiments and Cellular Automaton Model |
title_sort | study of grain growth in a ni-based superalloy by experiments and cellular automaton model |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8621609/ https://www.ncbi.nlm.nih.gov/pubmed/34832322 http://dx.doi.org/10.3390/ma14226922 |
work_keys_str_mv | AT liuyanxing studyofgraingrowthinanibasedsuperalloybyexperimentsandcellularautomatonmodel AT kezhijiang studyofgraingrowthinanibasedsuperalloybyexperimentsandcellularautomatonmodel AT lirunhua studyofgraingrowthinanibasedsuperalloybyexperimentsandcellularautomatonmodel AT songjuqing studyofgraingrowthinanibasedsuperalloybyexperimentsandcellularautomatonmodel AT ruanjingjing studyofgraingrowthinanibasedsuperalloybyexperimentsandcellularautomatonmodel |