Comparative investigation on ingot evolution and product quality under different arc distributions during vacuum arc remelting process
The arc characteristics especially the arc distribution of the vacuum arc remelting (VAR) process are closely related to the ingot evolution and consequently the final product quality. Taking segregation defects and solidification quality as the indexes to evaluate the final product quality under di...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422005580 |
| _version_ | 1811302890845765632 |
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| author | Jiajun Cui Baokuan Li Zhongqiu Liu Fengsheng Qi Jianxiang Xu Ji Zhang |
| author_facet | Jiajun Cui Baokuan Li Zhongqiu Liu Fengsheng Qi Jianxiang Xu Ji Zhang |
| author_sort | Jiajun Cui |
| collection | DOAJ |
| description | The arc characteristics especially the arc distribution of the vacuum arc remelting (VAR) process are closely related to the ingot evolution and consequently the final product quality. Taking segregation defects and solidification quality as the indexes to evaluate the final product quality under different arc distributions, a three-dimensional full-scale transient model for predicting segregation defects is developed in this paper. Local solidification time (LST) and secondary dendrite arm spacing (SDAS) are used to characterize the solidification quality. This model is adopted to predict channel segregation (freckle) and macrosegregation defects during VAR process of Ni-5.8 wt.%Al-15.2 wt.%Ta alloy under several typical arc distributions. The results show that the diffuse arc has the shallowest molten pool among several arc distributions. At the early stage of solidification, the solute enrichment channels formed under the Gaussian and diffuse arc are slender and concentrated, while they are relatively sparse and uneven in thickness under the rotating arc. The value of volume-averaged segregation extent is always the smallest under the diffuse arc and the largest under the Gaussian arc, with final values of 67.53% and 69.66%, respectively. The volume-averaged values of LST and SDAS are relatively the largest under the Gaussian arc, about 1599 s and 209 μm, respectively; and they are the smallest under the diffuse arc, about 1520 s and 206 μm, respectively. In the same process conditions, the product quality of VAR ingots prepared under the diffuse arc is the best, followed by the rotating arc, and the worst under the Gaussian arc. |
| first_indexed | 2024-04-13T07:37:32Z |
| format | Article |
| id | doaj.art-fc6047972cf5430daab9c3883b8e081c |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-13T07:37:32Z |
| publishDate | 2022-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-fc6047972cf5430daab9c3883b8e081c2022-12-22T02:56:04ZengElsevierJournal of Materials Research and Technology2238-78542022-05-011839914006Comparative investigation on ingot evolution and product quality under different arc distributions during vacuum arc remelting processJiajun Cui0Baokuan Li1Zhongqiu Liu2Fengsheng Qi3Jianxiang Xu4Ji Zhang5School of Metallurgy, Northeastern University, Shenyang, 110819, China; High Temperature Materials Division, China Iron and Steel Research Institute Group, Beijing, 100081, ChinaSchool of Metallurgy, Northeastern University, Shenyang, 110819, China; Corresponding author.School of Metallurgy, Northeastern University, Shenyang, 110819, China; Corresponding author.School 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, ChinaThe arc characteristics especially the arc distribution of the vacuum arc remelting (VAR) process are closely related to the ingot evolution and consequently the final product quality. Taking segregation defects and solidification quality as the indexes to evaluate the final product quality under different arc distributions, a three-dimensional full-scale transient model for predicting segregation defects is developed in this paper. Local solidification time (LST) and secondary dendrite arm spacing (SDAS) are used to characterize the solidification quality. This model is adopted to predict channel segregation (freckle) and macrosegregation defects during VAR process of Ni-5.8 wt.%Al-15.2 wt.%Ta alloy under several typical arc distributions. The results show that the diffuse arc has the shallowest molten pool among several arc distributions. At the early stage of solidification, the solute enrichment channels formed under the Gaussian and diffuse arc are slender and concentrated, while they are relatively sparse and uneven in thickness under the rotating arc. The value of volume-averaged segregation extent is always the smallest under the diffuse arc and the largest under the Gaussian arc, with final values of 67.53% and 69.66%, respectively. The volume-averaged values of LST and SDAS are relatively the largest under the Gaussian arc, about 1599 s and 209 μm, respectively; and they are the smallest under the diffuse arc, about 1520 s and 206 μm, respectively. In the same process conditions, the product quality of VAR ingots prepared under the diffuse arc is the best, followed by the rotating arc, and the worst under the Gaussian arc.http://www.sciencedirect.com/science/article/pii/S2238785422005580Vacuum arc remeltingArc distributionNi-based superalloySegregation defectSolidification quality |
| spellingShingle | Jiajun Cui Baokuan Li Zhongqiu Liu Fengsheng Qi Jianxiang Xu Ji Zhang Comparative investigation on ingot evolution and product quality under different arc distributions during vacuum arc remelting process Journal of Materials Research and Technology Vacuum arc remelting Arc distribution Ni-based superalloy Segregation defect Solidification quality |
| title | Comparative investigation on ingot evolution and product quality under different arc distributions during vacuum arc remelting process |
| title_full | Comparative investigation on ingot evolution and product quality under different arc distributions during vacuum arc remelting process |
| title_fullStr | Comparative investigation on ingot evolution and product quality under different arc distributions during vacuum arc remelting process |
| title_full_unstemmed | Comparative investigation on ingot evolution and product quality under different arc distributions during vacuum arc remelting process |
| title_short | Comparative investigation on ingot evolution and product quality under different arc distributions during vacuum arc remelting process |
| title_sort | comparative investigation on ingot evolution and product quality under different arc distributions during vacuum arc remelting process |
| topic | Vacuum arc remelting Arc distribution Ni-based superalloy Segregation defect Solidification quality |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422005580 |
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