A cellular automaton finite volume method for microstructure evolution during additive manufacturing
Additive manufacturing (AM) processes produce unique microstructures compared with other manufacturing processes because of the large thermal gradient, high solidification rate and other local temperature variations caused by the repeated heating and melting. However, the effect of these thermal pro...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-05-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127519301091 |
| _version_ | 1819117302660988928 |
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| author | Yanping Lian Zhengtao Gan Cheng Yu Dmitriy Kats Wing Kam Liu Gregory J. Wagner |
| author_facet | Yanping Lian Zhengtao Gan Cheng Yu Dmitriy Kats Wing Kam Liu Gregory J. Wagner |
| author_sort | Yanping Lian |
| collection | DOAJ |
| description | Additive manufacturing (AM) processes produce unique microstructures compared with other manufacturing processes because of the large thermal gradient, high solidification rate and other local temperature variations caused by the repeated heating and melting. However, the effect of these thermal profiles on the microstructure is not thoroughly understood. In this work, a 3D cellular automaton method is coupled to a finite volume method to predict the grain structure of an alloy, e.g. Inconel 718, fabricated by AM. The heat convection due to thermocapillary flow inside the melt pool is resolved by the finite volume method for a real and accurate temperature field, while an enriched grain nucleation scheme is implemented to capture epitaxial grain growth following the mechanism identified from experiments. Simulated microstructure results are shown to be in qualitative agreement with experimental result and the effects of the process parameters on both thermal characteristics and the grain structure are identified. The 3D cellular automaton finite volume method results establish our approach as a powerful technique to model grain evolution for AM and to address the process-structure-property relationship. Keywords: Additive manufacturing, Solidification, Grain structure, Cellular automaton, Finite volume method |
| first_indexed | 2024-12-22T05:30:50Z |
| format | Article |
| id | doaj.art-b9ec7effb9b4480199ff928cbf15f73b |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-22T05:30:50Z |
| publishDate | 2019-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-b9ec7effb9b4480199ff928cbf15f73b2022-12-21T18:37:28ZengElsevierMaterials & Design0264-12752019-05-01169A cellular automaton finite volume method for microstructure evolution during additive manufacturingYanping Lian0Zhengtao Gan1Cheng Yu2Dmitriy Kats3Wing Kam Liu4Gregory J. Wagner5Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, China; Corresponding authors.Department of Mechanical Engineering, Northwestern University, Evanston, IL, USADepartment of Mechanical Engineering, Northwestern University, Evanston, IL, USADepartment of Mechanical Engineering, Northwestern University, Evanston, IL, USADepartment of Mechanical Engineering, Northwestern University, Evanston, IL, USADepartment of Mechanical Engineering, Northwestern University, Evanston, IL, USA; Corresponding authors.Additive manufacturing (AM) processes produce unique microstructures compared with other manufacturing processes because of the large thermal gradient, high solidification rate and other local temperature variations caused by the repeated heating and melting. However, the effect of these thermal profiles on the microstructure is not thoroughly understood. In this work, a 3D cellular automaton method is coupled to a finite volume method to predict the grain structure of an alloy, e.g. Inconel 718, fabricated by AM. The heat convection due to thermocapillary flow inside the melt pool is resolved by the finite volume method for a real and accurate temperature field, while an enriched grain nucleation scheme is implemented to capture epitaxial grain growth following the mechanism identified from experiments. Simulated microstructure results are shown to be in qualitative agreement with experimental result and the effects of the process parameters on both thermal characteristics and the grain structure are identified. The 3D cellular automaton finite volume method results establish our approach as a powerful technique to model grain evolution for AM and to address the process-structure-property relationship. Keywords: Additive manufacturing, Solidification, Grain structure, Cellular automaton, Finite volume methodhttp://www.sciencedirect.com/science/article/pii/S0264127519301091 |
| spellingShingle | Yanping Lian Zhengtao Gan Cheng Yu Dmitriy Kats Wing Kam Liu Gregory J. Wagner A cellular automaton finite volume method for microstructure evolution during additive manufacturing Materials & Design |
| title | A cellular automaton finite volume method for microstructure evolution during additive manufacturing |
| title_full | A cellular automaton finite volume method for microstructure evolution during additive manufacturing |
| title_fullStr | A cellular automaton finite volume method for microstructure evolution during additive manufacturing |
| title_full_unstemmed | A cellular automaton finite volume method for microstructure evolution during additive manufacturing |
| title_short | A cellular automaton finite volume method for microstructure evolution during additive manufacturing |
| title_sort | cellular automaton finite volume method for microstructure evolution during additive manufacturing |
| url | http://www.sciencedirect.com/science/article/pii/S0264127519301091 |
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