A study of thermomechanical behaviour and grain size evolution of AA7050 under hot forging conditions
A series of compression tests have been carried out using Gleeble (3800) thermomechanical simulator to investigate the viscoplastic behaviour of AA7050 as well as its microstructural characteristics under hot forging conditions. The thermomechanical tests were conducted at the temperatures of 350–45...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2019-03-01
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| Series: | International Journal of Lightweight Materials and Manufacture |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2588840418300696 |
| _version_ | 1811278963178209280 |
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| author | Weishu Li Yaoqiong Liu Shuai Jiang Qinmeng Luan Yibo Li Bin Gu Zhusheng Shi |
| author_facet | Weishu Li Yaoqiong Liu Shuai Jiang Qinmeng Luan Yibo Li Bin Gu Zhusheng Shi |
| author_sort | Weishu Li |
| collection | DOAJ |
| description | A series of compression tests have been carried out using Gleeble (3800) thermomechanical simulator to investigate the viscoplastic behaviour of AA7050 as well as its microstructural characteristics under hot forging conditions. The thermomechanical tests were conducted at the temperatures of 350–450 °C with strain rates of 0.0005–0.5 s−1, which covers the range of hot forging conditions for AA7050. Interrupted tests have also been carried out to track the microstructural evolution under various thermomechanical deformation conditions. Particular attention has been focused on the criteria of dynamic recrystallisation in AA7050 during the uniaxial compression at high temperatures, which could help to obtain regular homogeneous grain structures for hot forged components. It was found that AA7050 has a strong viscoplastic behaviour and flow stress is more than halved from 350 to 450 °C. A suitably low strain rate and high temperature are required for significant dynamic recrystallisation (0.05 s−1 and 400 °C in current deformation level). The average grain size decreases with increasing strain and deformation temperature due to dynamic recrystallisation, but the relationship between average grain size and strain rate is not monotonic. Present findings provide a guideline for the selection of hot forging parameters so that quality components could be achieved with low forging force. Keywords: AA7050, Hot forging, Viscoplastic behaviour, Microstructural evolution, Dynamic recrystallisation, Grain size |
| first_indexed | 2024-04-13T00:46:19Z |
| format | Article |
| id | doaj.art-1cf43d9d2e0c4fd3aeaf327866a853fa |
| institution | Directory Open Access Journal |
| issn | 2588-8404 |
| language | English |
| last_indexed | 2024-04-13T00:46:19Z |
| publishDate | 2019-03-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | International Journal of Lightweight Materials and Manufacture |
| spelling | doaj.art-1cf43d9d2e0c4fd3aeaf327866a853fa2022-12-22T03:10:00ZengKeAi Communications Co., Ltd.International Journal of Lightweight Materials and Manufacture2588-84042019-03-01213139A study of thermomechanical behaviour and grain size evolution of AA7050 under hot forging conditionsWeishu Li0Yaoqiong Liu1Shuai Jiang2Qinmeng Luan3Yibo Li4Bin Gu5Zhusheng Shi6Department of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UKAVIC the First Aircraft Institute, Xi'an, PR China; Central South University, Changsha, PR ChinaDepartment of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UKDepartment of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UKCentral South University, Changsha, PR ChinaAVIC the First Aircraft Institute, Xi'an, PR ChinaDepartment of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UK; Corresponding author.A series of compression tests have been carried out using Gleeble (3800) thermomechanical simulator to investigate the viscoplastic behaviour of AA7050 as well as its microstructural characteristics under hot forging conditions. The thermomechanical tests were conducted at the temperatures of 350–450 °C with strain rates of 0.0005–0.5 s−1, which covers the range of hot forging conditions for AA7050. Interrupted tests have also been carried out to track the microstructural evolution under various thermomechanical deformation conditions. Particular attention has been focused on the criteria of dynamic recrystallisation in AA7050 during the uniaxial compression at high temperatures, which could help to obtain regular homogeneous grain structures for hot forged components. It was found that AA7050 has a strong viscoplastic behaviour and flow stress is more than halved from 350 to 450 °C. A suitably low strain rate and high temperature are required for significant dynamic recrystallisation (0.05 s−1 and 400 °C in current deformation level). The average grain size decreases with increasing strain and deformation temperature due to dynamic recrystallisation, but the relationship between average grain size and strain rate is not monotonic. Present findings provide a guideline for the selection of hot forging parameters so that quality components could be achieved with low forging force. Keywords: AA7050, Hot forging, Viscoplastic behaviour, Microstructural evolution, Dynamic recrystallisation, Grain sizehttp://www.sciencedirect.com/science/article/pii/S2588840418300696 |
| spellingShingle | Weishu Li Yaoqiong Liu Shuai Jiang Qinmeng Luan Yibo Li Bin Gu Zhusheng Shi A study of thermomechanical behaviour and grain size evolution of AA7050 under hot forging conditions International Journal of Lightweight Materials and Manufacture |
| title | A study of thermomechanical behaviour and grain size evolution of AA7050 under hot forging conditions |
| title_full | A study of thermomechanical behaviour and grain size evolution of AA7050 under hot forging conditions |
| title_fullStr | A study of thermomechanical behaviour and grain size evolution of AA7050 under hot forging conditions |
| title_full_unstemmed | A study of thermomechanical behaviour and grain size evolution of AA7050 under hot forging conditions |
| title_short | A study of thermomechanical behaviour and grain size evolution of AA7050 under hot forging conditions |
| title_sort | study of thermomechanical behaviour and grain size evolution of aa7050 under hot forging conditions |
| url | http://www.sciencedirect.com/science/article/pii/S2588840418300696 |
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