Numerical Investigation of Segregation Evolution during the Vacuum Arc Remelting Process of Ni-Based Superalloy Ingots
Segregation defects greatly affect the service performance and working life of castings during the vacuum arc remelting (VAR) process. However, the corresponding research on the prediction of segregation defects is still not comprehensive. Through considering the influence of water-cooled crucible o...
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MDPI AG
2021-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/12/2046 |
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| author | Jiajun Cui Baokuan Li Zhongqiu Liu Fengsheng Qi Beijiang Zhang Ji Zhang |
| author_facet | Jiajun Cui Baokuan Li Zhongqiu Liu Fengsheng Qi Beijiang Zhang Ji Zhang |
| author_sort | Jiajun Cui |
| collection | DOAJ |
| description | Segregation defects greatly affect the service performance and working life of castings during the vacuum arc remelting (VAR) process. However, the corresponding research on the prediction of segregation defects is still not comprehensive. Through considering the influence of water-cooled crucible on the electromagnetic field inside an ingot, a full-scale model for the comprehensive prediction of freckles and macrosegregation defects during the VAR process is developed in this paper. The macroscopic solute transport phenomenon and the segregation behavior of Ni-5.8 wt% Al-15.2 wt% Ta alloy are predicted. The results indicate that the freckles are mainly concentrated in the lower region of the ingot. With the growth of the ingot, the solute enrichment channels gradually develop into solute enrichment regions, and the channel segregation evolves into macrosegregation. The Lorentz force mainly affects the flow pattern at the top of the molten pool, while the complex flow of multiple vortices is dominated by thermosolutal buoyancy. The maximum and minimum relative segregation ratio inside the ingot can reach 290% and −90%, respectively, and the positive segregation region accounts for about 79% of the total volume. This paper provides a new perspective for understanding the segregation behavior inside the ingot by studying the segregation evolution during the VAR process. |
| first_indexed | 2024-03-10T03:34:16Z |
| format | Article |
| id | doaj.art-82e41e3d52274734bdc619da27b4ecf4 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T03:34:16Z |
| publishDate | 2021-12-01 |
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| spelling | doaj.art-82e41e3d52274734bdc619da27b4ecf42023-11-23T09:34:44ZengMDPI AGMetals2075-47012021-12-011112204610.3390/met11122046Numerical Investigation of Segregation Evolution during the Vacuum Arc Remelting Process of Ni-Based Superalloy IngotsJiajun Cui0Baokuan Li1Zhongqiu Liu2Fengsheng Qi3Beijiang Zhang4Ji Zhang5School of Metallurgy, Northeastern University, Shenyang 110819, ChinaSchool of Metallurgy, Northeastern University, Shenyang 110819, ChinaSchool of Metallurgy, Northeastern University, Shenyang 110819, ChinaSchool of Metallurgy, Northeastern University, Shenyang 110819, ChinaHigh Temperature Materials Division, China Iron and Steel Research Institute Group, Beijing 100081, ChinaHigh Temperature Materials Division, China Iron and Steel Research Institute Group, Beijing 100081, ChinaSegregation defects greatly affect the service performance and working life of castings during the vacuum arc remelting (VAR) process. However, the corresponding research on the prediction of segregation defects is still not comprehensive. Through considering the influence of water-cooled crucible on the electromagnetic field inside an ingot, a full-scale model for the comprehensive prediction of freckles and macrosegregation defects during the VAR process is developed in this paper. The macroscopic solute transport phenomenon and the segregation behavior of Ni-5.8 wt% Al-15.2 wt% Ta alloy are predicted. The results indicate that the freckles are mainly concentrated in the lower region of the ingot. With the growth of the ingot, the solute enrichment channels gradually develop into solute enrichment regions, and the channel segregation evolves into macrosegregation. The Lorentz force mainly affects the flow pattern at the top of the molten pool, while the complex flow of multiple vortices is dominated by thermosolutal buoyancy. The maximum and minimum relative segregation ratio inside the ingot can reach 290% and −90%, respectively, and the positive segregation region accounts for about 79% of the total volume. This paper provides a new perspective for understanding the segregation behavior inside the ingot by studying the segregation evolution during the VAR process.https://www.mdpi.com/2075-4701/11/12/2046vacuum arc remeltingNi-based superalloyfreckle formationmacrosegregationnumerical simulation |
| spellingShingle | Jiajun Cui Baokuan Li Zhongqiu Liu Fengsheng Qi Beijiang Zhang Ji Zhang Numerical Investigation of Segregation Evolution during the Vacuum Arc Remelting Process of Ni-Based Superalloy Ingots Metals vacuum arc remelting Ni-based superalloy freckle formation macrosegregation numerical simulation |
| title | Numerical Investigation of Segregation Evolution during the Vacuum Arc Remelting Process of Ni-Based Superalloy Ingots |
| title_full | Numerical Investigation of Segregation Evolution during the Vacuum Arc Remelting Process of Ni-Based Superalloy Ingots |
| title_fullStr | Numerical Investigation of Segregation Evolution during the Vacuum Arc Remelting Process of Ni-Based Superalloy Ingots |
| title_full_unstemmed | Numerical Investigation of Segregation Evolution during the Vacuum Arc Remelting Process of Ni-Based Superalloy Ingots |
| title_short | Numerical Investigation of Segregation Evolution during the Vacuum Arc Remelting Process of Ni-Based Superalloy Ingots |
| title_sort | numerical investigation of segregation evolution during the vacuum arc remelting process of ni based superalloy ingots |
| topic | vacuum arc remelting Ni-based superalloy freckle formation macrosegregation numerical simulation |
| url | https://www.mdpi.com/2075-4701/11/12/2046 |
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