Freckles pattern and microstructure feature of Nb-Ti alloy produced by vacuum arc remelting
Nb-Ti alloys are normally produced by vacuum arc remelting process. Due to inadequate processing parameters, freckles can be observed in macroetched ingots. In the present work, visual, chemical, metallographic, and X-ray are presented which establish the appearance, composition, microstructure diff...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2020-01-01
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| Series: | MATEC Web of Conferences |
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| Online Access: | https://www.matec-conferences.org/articles/matecconf/pdf/2020/17/matecconf_ti2019_10009.pdf |
| _version_ | 1818355186455805952 |
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| author | Shang Jinjin He Yongsheng Yang Ce Wu Ming Luo Wenzhong Wang Kaixuan |
| author_facet | Shang Jinjin He Yongsheng Yang Ce Wu Ming Luo Wenzhong Wang Kaixuan |
| author_sort | Shang Jinjin |
| collection | DOAJ |
| description | Nb-Ti alloys are normally produced by vacuum arc remelting process. Due to inadequate processing parameters, freckles can be observed in macroetched ingots. In the present work, visual, chemical, metallographic, and X-ray are presented which establish the appearance, composition, microstructure differences between freckle regions and normal regions. It has been observed that in freckles parallel to the ingot axis, the Ti content is up to 53wt%, 7wt% higher than normal regions. It is also shown that a lot of precipitation phases appeared in freckle regions, because of the thermosolutal convection in the mushy zone. The Rayleigh number, which recommended as a criterion for freckle initiation, has been calculated that using a VAR melting software. Based on the experimental results and simulation results, it is concluded that freckles can be influenced by processing parameters, and freckles in Nb-Ti alloy can be eliminated by matching appropriate processing parameters. |
| first_indexed | 2024-12-13T19:37:19Z |
| format | Article |
| id | doaj.art-a7521f13e5b44a89874979797832dc50 |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-12-13T19:37:19Z |
| publishDate | 2020-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-a7521f13e5b44a89874979797832dc502022-12-21T23:33:46ZengEDP SciencesMATEC Web of Conferences2261-236X2020-01-013211000910.1051/matecconf/202032110009matecconf_ti2019_10009Freckles pattern and microstructure feature of Nb-Ti alloy produced by vacuum arc remeltingShang JinjinHe YongshengYang CeWu MingLuo WenzhongWang KaixuanNb-Ti alloys are normally produced by vacuum arc remelting process. Due to inadequate processing parameters, freckles can be observed in macroetched ingots. In the present work, visual, chemical, metallographic, and X-ray are presented which establish the appearance, composition, microstructure differences between freckle regions and normal regions. It has been observed that in freckles parallel to the ingot axis, the Ti content is up to 53wt%, 7wt% higher than normal regions. It is also shown that a lot of precipitation phases appeared in freckle regions, because of the thermosolutal convection in the mushy zone. The Rayleigh number, which recommended as a criterion for freckle initiation, has been calculated that using a VAR melting software. Based on the experimental results and simulation results, it is concluded that freckles can be influenced by processing parameters, and freckles in Nb-Ti alloy can be eliminated by matching appropriate processing parameters.https://www.matec-conferences.org/articles/matecconf/pdf/2020/17/matecconf_ti2019_10009.pdfnb-ti alloyfrecklevacuum arc remelting |
| spellingShingle | Shang Jinjin He Yongsheng Yang Ce Wu Ming Luo Wenzhong Wang Kaixuan Freckles pattern and microstructure feature of Nb-Ti alloy produced by vacuum arc remelting MATEC Web of Conferences nb-ti alloy freckle vacuum arc remelting |
| title | Freckles pattern and microstructure feature of Nb-Ti alloy produced by vacuum arc remelting |
| title_full | Freckles pattern and microstructure feature of Nb-Ti alloy produced by vacuum arc remelting |
| title_fullStr | Freckles pattern and microstructure feature of Nb-Ti alloy produced by vacuum arc remelting |
| title_full_unstemmed | Freckles pattern and microstructure feature of Nb-Ti alloy produced by vacuum arc remelting |
| title_short | Freckles pattern and microstructure feature of Nb-Ti alloy produced by vacuum arc remelting |
| title_sort | freckles pattern and microstructure feature of nb ti alloy produced by vacuum arc remelting |
| topic | nb-ti alloy freckle vacuum arc remelting |
| url | https://www.matec-conferences.org/articles/matecconf/pdf/2020/17/matecconf_ti2019_10009.pdf |
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