Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy
Grain-growth behaviors of TC4–DT alloy in a narrow temperature range (990 °C−1050 °C) were systematically investigated, and the effects of which on the lamellar structural evolution and mechanical properties were quantitatively evaluated. Microstructural observations indicated that prior β grain siz...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/ab99e7 |
| _version_ | 1797746347480186880 |
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| author | Entao Dong Wei Yu Qingwu Cai Lei Cheng Gaoxiang Gong |
| author_facet | Entao Dong Wei Yu Qingwu Cai Lei Cheng Gaoxiang Gong |
| author_sort | Entao Dong |
| collection | DOAJ |
| description | Grain-growth behaviors of TC4–DT alloy in a narrow temperature range (990 °C−1050 °C) were systematically investigated, and the effects of which on the lamellar structural evolution and mechanical properties were quantitatively evaluated. Microstructural observations indicated that prior β grain size increased with an increase in heat-treatment temperature and time, which was described by the modified Sellars model. The grain-growth exponent ( n = 2.741) and activation energy ( Q = 161.0 kJ mol ^−1 ) during β treatment were confirmed. The α colony size similar to β grain varied significantly with the heat-treatment conditions, while α plate thickness changed slightly. The Hall–Petch equation could qualitatively exhibit the relationships between the lamellar microstructure parameters (prior β grain size, α colony size, and α plate thickness) and mechanical properties (strength, ductility, and impact toughness). The fine prior β grain that contained different orientated α colonies produced more boundaries to hinder dislocation motion and crack propagation, which contributed a more circuitous crack growth path. The results indicated that the control of α colony size was critical to improve the mechanical performance of TC4–DT alloy. |
| first_indexed | 2024-03-12T15:35:33Z |
| format | Article |
| id | doaj.art-9ab8bb662bf94c0da170a496fdbe0f8b |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:35:33Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-9ab8bb662bf94c0da170a496fdbe0f8b2023-08-09T16:15:25ZengIOP PublishingMaterials Research Express2053-15912020-01-017606651410.1088/2053-1591/ab99e7Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloyEntao Dong0https://orcid.org/0000-0003-1445-767XWei Yu1Qingwu Cai2Lei Cheng3Gaoxiang Gong4Institute of Engineering Technology, University of Science and Technology Beijing , Beijing 100083, People’s Republic of China; Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing , Beijing 100083, People’s Republic of ChinaInstitute of Engineering Technology, University of Science and Technology Beijing , Beijing 100083, People’s Republic of ChinaInstitute of Engineering Technology, University of Science and Technology Beijing , Beijing 100083, People’s Republic of China; Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing , Beijing 100083, People’s Republic of ChinaInstitute of Engineering Technology, University of Science and Technology Beijing , Beijing 100083, People’s Republic of ChinaSchool of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, People’s Republic of ChinaGrain-growth behaviors of TC4–DT alloy in a narrow temperature range (990 °C−1050 °C) were systematically investigated, and the effects of which on the lamellar structural evolution and mechanical properties were quantitatively evaluated. Microstructural observations indicated that prior β grain size increased with an increase in heat-treatment temperature and time, which was described by the modified Sellars model. The grain-growth exponent ( n = 2.741) and activation energy ( Q = 161.0 kJ mol ^−1 ) during β treatment were confirmed. The α colony size similar to β grain varied significantly with the heat-treatment conditions, while α plate thickness changed slightly. The Hall–Petch equation could qualitatively exhibit the relationships between the lamellar microstructure parameters (prior β grain size, α colony size, and α plate thickness) and mechanical properties (strength, ductility, and impact toughness). The fine prior β grain that contained different orientated α colonies produced more boundaries to hinder dislocation motion and crack propagation, which contributed a more circuitous crack growth path. The results indicated that the control of α colony size was critical to improve the mechanical performance of TC4–DT alloy.https://doi.org/10.1088/2053-1591/ab99e7TC4–DT alloyheat-treatmentgrain-growthlamellar structuremechanical properties |
| spellingShingle | Entao Dong Wei Yu Qingwu Cai Lei Cheng Gaoxiang Gong Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy Materials Research Express TC4–DT alloy heat-treatment grain-growth lamellar structure mechanical properties |
| title | Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy |
| title_full | Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy |
| title_fullStr | Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy |
| title_full_unstemmed | Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy |
| title_short | Effects of β grain-growth behaviors on lamellar structural evolution and mechanical properties of TC4–DT alloy |
| title_sort | effects of β grain growth behaviors on lamellar structural evolution and mechanical properties of tc4 dt alloy |
| topic | TC4–DT alloy heat-treatment grain-growth lamellar structure mechanical properties |
| url | https://doi.org/10.1088/2053-1591/ab99e7 |
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