Multiphase-field simulation of grain coalescence behavior and its effects on solidification cracking susceptibility during welding of Al-Cu alloys
Solidification cracking (SC) is highly related to the grain coalescence behavior during welding of aluminum alloys. In this study, the grain coalescence behavior and its effects on solidification cracking susceptibility (SCS) were investigated using the multiphase-field approach. Why SCS is high at...
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Elsevier
2021-12-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127521007012 |
| _version_ | 1818733037792264192 |
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| author | Chu Han Ping Jiang Shaoning Geng Song Gao Gaoyang Mi Chunming Wang |
| author_facet | Chu Han Ping Jiang Shaoning Geng Song Gao Gaoyang Mi Chunming Wang |
| author_sort | Chu Han |
| collection | DOAJ |
| description | Solidification cracking (SC) is highly related to the grain coalescence behavior during welding of aluminum alloys. In this study, the grain coalescence behavior and its effects on solidification cracking susceptibility (SCS) were investigated using the multiphase-field approach. Why SCS is high at a certain value of Cu concentration and why SC often occurs at high misorientation angles are revealed. Firstly, nominal compositions of Cu affect the morphology of microstructure during solidification. The crystals morphology is cellular at the low concentration, while the crystals are dendritic at the high concentration in the columnar grain region. The SCS of cellular grains is higher than dendrites due to the high volume fraction of solid when the grains/subgrains bridge. Under the action of tensile stress, the scarce residual liquid phase cannot backfill in time. Secondly, high misorientation angles make grain boundary energy in the solid–solid interface (σSS) is high. It is found that σSS suppresses the grain coalescence and increases the SCS of alloys. This leads the emergence of SC at high misorientation angles during welding. In this study, the coalescence behavior of grains during solidification is visually presented by simulation and the coherency point at the last-stage solidification is achieved accurately. |
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| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-17T23:43:06Z |
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| spelling | doaj.art-6bd07b78df9f4ab9aafccaad675dde592022-12-21T21:28:23ZengElsevierMaterials & Design0264-12752021-12-01211110146Multiphase-field simulation of grain coalescence behavior and its effects on solidification cracking susceptibility during welding of Al-Cu alloysChu Han0Ping Jiang1Shaoning Geng2Song Gao3Gaoyang Mi4Chunming Wang5The State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science & Technology, 430074 Wuhan, PR ChinaThe State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science & Technology, 430074 Wuhan, PR ChinaThe State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science & Technology, 430074 Wuhan, PR China; Corresponding author.The State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science & Technology, 430074 Wuhan, PR ChinaSchool of Materials Science and Engineering, Huazhong University of Science & Technology, 430074 Wuhan, PR ChinaSchool of Materials Science and Engineering, Huazhong University of Science & Technology, 430074 Wuhan, PR ChinaSolidification cracking (SC) is highly related to the grain coalescence behavior during welding of aluminum alloys. In this study, the grain coalescence behavior and its effects on solidification cracking susceptibility (SCS) were investigated using the multiphase-field approach. Why SCS is high at a certain value of Cu concentration and why SC often occurs at high misorientation angles are revealed. Firstly, nominal compositions of Cu affect the morphology of microstructure during solidification. The crystals morphology is cellular at the low concentration, while the crystals are dendritic at the high concentration in the columnar grain region. The SCS of cellular grains is higher than dendrites due to the high volume fraction of solid when the grains/subgrains bridge. Under the action of tensile stress, the scarce residual liquid phase cannot backfill in time. Secondly, high misorientation angles make grain boundary energy in the solid–solid interface (σSS) is high. It is found that σSS suppresses the grain coalescence and increases the SCS of alloys. This leads the emergence of SC at high misorientation angles during welding. In this study, the coalescence behavior of grains during solidification is visually presented by simulation and the coherency point at the last-stage solidification is achieved accurately.http://www.sciencedirect.com/science/article/pii/S0264127521007012Grain coalescenceSolidification cracking susceptibilityWeldingAl-Cu alloysMultiphase-field model |
| spellingShingle | Chu Han Ping Jiang Shaoning Geng Song Gao Gaoyang Mi Chunming Wang Multiphase-field simulation of grain coalescence behavior and its effects on solidification cracking susceptibility during welding of Al-Cu alloys Materials & Design Grain coalescence Solidification cracking susceptibility Welding Al-Cu alloys Multiphase-field model |
| title | Multiphase-field simulation of grain coalescence behavior and its effects on solidification cracking susceptibility during welding of Al-Cu alloys |
| title_full | Multiphase-field simulation of grain coalescence behavior and its effects on solidification cracking susceptibility during welding of Al-Cu alloys |
| title_fullStr | Multiphase-field simulation of grain coalescence behavior and its effects on solidification cracking susceptibility during welding of Al-Cu alloys |
| title_full_unstemmed | Multiphase-field simulation of grain coalescence behavior and its effects on solidification cracking susceptibility during welding of Al-Cu alloys |
| title_short | Multiphase-field simulation of grain coalescence behavior and its effects on solidification cracking susceptibility during welding of Al-Cu alloys |
| title_sort | multiphase field simulation of grain coalescence behavior and its effects on solidification cracking susceptibility during welding of al cu alloys |
| topic | Grain coalescence Solidification cracking susceptibility Welding Al-Cu alloys Multiphase-field model |
| url | http://www.sciencedirect.com/science/article/pii/S0264127521007012 |
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