Phase transition kinetics and microstructures of A508-3 steel under continuous cooling process
The phase transition kinetics of A508-3 steel during continuous cooling were studied by high temperature transition instrument which was based on thermodilatometry in this paper. The microstructures during continuous heating and cooling were also observed. The transition points were determined to be...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2022-01-01
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| Series: | Heat Treatment and Surface Engineering |
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| Online Access: | http://dx.doi.org/10.1080/25787616.2022.2026045 |
| _version_ | 1818972064330022912 |
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| author | Yong Liu Nan Qu Jianwei Ren Yan Zhang Jingchuan Zhu |
| author_facet | Yong Liu Nan Qu Jianwei Ren Yan Zhang Jingchuan Zhu |
| author_sort | Yong Liu |
| collection | DOAJ |
| description | The phase transition kinetics of A508-3 steel during continuous cooling were studied by high temperature transition instrument which was based on thermodilatometry in this paper. The microstructures during continuous heating and cooling were also observed. The transition points were determined to be austenite formation temperatures, Ac1 = 757 °C, Ac3 = 823 °C, and martensitic transformation start and final temperatures, Ms = 382 °C, Mf = 222 °C at the cooling rate of 5 °C/s. The curves of Austenite transition fraction and time during continuous heating show a typical S shape. And the Austenite will show a maximum transition rate value at the middle temperature. The volume fraction of new phases translated from Austenite as functions of time and temperature during the cooling process can be obtained using the lever law. The pearlite transitions can occur in high temperature region at cooling rate smaller than 0.1 °C/s. And Bainite can be gotten at a lower temperature region. The S type curves can be used to describe the relationships between the transition volume fraction and time. Increasing the cooling rate enhances the volume fraction of Martensite at the cooling rate ≥5 °C/s. And only Martensite transition can be observed at the cooling rate > 10 °C/s. And Ms and Mf increase with increasing cooling rate. The Martensite transition kinetics equation with changing temperature were obtained. Finally, the continuous cooling transformation curves of A508-3 steel was constructed, which can be used to predict the microstructure and design the heat treatment technologies. |
| first_indexed | 2024-12-20T15:02:19Z |
| format | Article |
| id | doaj.art-a34b7b7be54b4011acaeddc561ee0479 |
| institution | Directory Open Access Journal |
| issn | 2578-7616 |
| language | English |
| last_indexed | 2024-12-20T15:02:19Z |
| publishDate | 2022-01-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Heat Treatment and Surface Engineering |
| spelling | doaj.art-a34b7b7be54b4011acaeddc561ee04792022-12-21T19:36:36ZengTaylor & Francis GroupHeat Treatment and Surface Engineering2578-76162022-01-010011610.1080/25787616.2022.20260452026045Phase transition kinetics and microstructures of A508-3 steel under continuous cooling processYong Liu0Nan Qu1Jianwei Ren2Yan Zhang3Jingchuan Zhu4Harbin Institute of TechnologyHarbin Institute of TechnologyHarbin Institute of TechnologyHarbin Institute of TechnologyHarbin Institute of TechnologyThe phase transition kinetics of A508-3 steel during continuous cooling were studied by high temperature transition instrument which was based on thermodilatometry in this paper. The microstructures during continuous heating and cooling were also observed. The transition points were determined to be austenite formation temperatures, Ac1 = 757 °C, Ac3 = 823 °C, and martensitic transformation start and final temperatures, Ms = 382 °C, Mf = 222 °C at the cooling rate of 5 °C/s. The curves of Austenite transition fraction and time during continuous heating show a typical S shape. And the Austenite will show a maximum transition rate value at the middle temperature. The volume fraction of new phases translated from Austenite as functions of time and temperature during the cooling process can be obtained using the lever law. The pearlite transitions can occur in high temperature region at cooling rate smaller than 0.1 °C/s. And Bainite can be gotten at a lower temperature region. The S type curves can be used to describe the relationships between the transition volume fraction and time. Increasing the cooling rate enhances the volume fraction of Martensite at the cooling rate ≥5 °C/s. And only Martensite transition can be observed at the cooling rate > 10 °C/s. And Ms and Mf increase with increasing cooling rate. The Martensite transition kinetics equation with changing temperature were obtained. Finally, the continuous cooling transformation curves of A508-3 steel was constructed, which can be used to predict the microstructure and design the heat treatment technologies.http://dx.doi.org/10.1080/25787616.2022.2026045a508-3 steelcontinuous coolingphase transition kineticsmicrostructures |
| spellingShingle | Yong Liu Nan Qu Jianwei Ren Yan Zhang Jingchuan Zhu Phase transition kinetics and microstructures of A508-3 steel under continuous cooling process Heat Treatment and Surface Engineering a508-3 steel continuous cooling phase transition kinetics microstructures |
| title | Phase transition kinetics and microstructures of A508-3 steel under continuous cooling process |
| title_full | Phase transition kinetics and microstructures of A508-3 steel under continuous cooling process |
| title_fullStr | Phase transition kinetics and microstructures of A508-3 steel under continuous cooling process |
| title_full_unstemmed | Phase transition kinetics and microstructures of A508-3 steel under continuous cooling process |
| title_short | Phase transition kinetics and microstructures of A508-3 steel under continuous cooling process |
| title_sort | phase transition kinetics and microstructures of a508 3 steel under continuous cooling process |
| topic | a508-3 steel continuous cooling phase transition kinetics microstructures |
| url | http://dx.doi.org/10.1080/25787616.2022.2026045 |
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