Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions
In this paper, a set of mechanism based unified viscoplastic constitutive equations have been established for two-phase titanium alloys with initial lamellar microstructure, which models the softening mechanisms of the alloys in hot forming conditions. The dislocation density, rotation and globulari...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2016-01-01
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| Series: | Manufacturing Review |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1051/mfreview/2016016 |
| _version_ | 1818246071504076800 |
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| author | Yang Lei Li Nan Wang Baoyu Lin Jianguo Zhao Huijun Ma Wenyu |
| author_facet | Yang Lei Li Nan Wang Baoyu Lin Jianguo Zhao Huijun Ma Wenyu |
| author_sort | Yang Lei |
| collection | DOAJ |
| description | In this paper, a set of mechanism based unified viscoplastic constitutive equations have been established for two-phase titanium alloys with initial lamellar microstructure, which models the softening mechanisms of the alloys in hot forming conditions. The dislocation density, rotation and globularization of lamellar α-phase and their effects on flow behaviour can also be modelled. The values of material constants in the equation set have been calibrated, according to stress-strain curves and globularization fractions of lamellar α-phase obtained from compression tests at a range of temperatures and strain rates, using a genetic algorithm (GA) based optimisation method. Based on the determined constitutive equations, flow stress and globularization evolution of Ti-17 and TA15 alloys at different temperatures and strain rates were predicted. Good agreements between the experimental and computed results were obtained. |
| first_indexed | 2024-12-12T14:42:59Z |
| format | Article |
| id | doaj.art-36e9580652d24732879f5fb1190f1752 |
| institution | Directory Open Access Journal |
| issn | 2265-4224 |
| language | English |
| last_indexed | 2024-12-12T14:42:59Z |
| publishDate | 2016-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Manufacturing Review |
| spelling | doaj.art-36e9580652d24732879f5fb1190f17522022-12-22T00:21:10ZengEDP SciencesManufacturing Review2265-42242016-01-0131410.1051/mfreview/2016016mfreview160008Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditionsYang LeiLi NanWang BaoyuLin JianguoZhao HuijunMa WenyuIn this paper, a set of mechanism based unified viscoplastic constitutive equations have been established for two-phase titanium alloys with initial lamellar microstructure, which models the softening mechanisms of the alloys in hot forming conditions. The dislocation density, rotation and globularization of lamellar α-phase and their effects on flow behaviour can also be modelled. The values of material constants in the equation set have been calibrated, according to stress-strain curves and globularization fractions of lamellar α-phase obtained from compression tests at a range of temperatures and strain rates, using a genetic algorithm (GA) based optimisation method. Based on the determined constitutive equations, flow stress and globularization evolution of Ti-17 and TA15 alloys at different temperatures and strain rates were predicted. Good agreements between the experimental and computed results were obtained.http://dx.doi.org/10.1051/mfreview/2016016Hot formingUnified viscoplastic constitutive equationsLamellar microstructureSoftening mechanismTwo-phase titanium alloysGlobularization |
| spellingShingle | Yang Lei Li Nan Wang Baoyu Lin Jianguo Zhao Huijun Ma Wenyu Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions Manufacturing Review Hot forming Unified viscoplastic constitutive equations Lamellar microstructure Softening mechanism Two-phase titanium alloys Globularization |
| title | Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions |
| title_full | Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions |
| title_fullStr | Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions |
| title_full_unstemmed | Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions |
| title_short | Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions |
| title_sort | unified constitutive modelling for two phase lamellar titanium alloys at hot forming conditions |
| topic | Hot forming Unified viscoplastic constitutive equations Lamellar microstructure Softening mechanism Two-phase titanium alloys Globularization |
| url | http://dx.doi.org/10.1051/mfreview/2016016 |
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