Mechanical properties and fractographic analyses of FeCo-2V alloy heat-treated around order-disorder transition temperature
The effect of heat treatment on the mechanical properties of FeCo-2V alloy was investigated at temperatures slightly above and below its order-disorder transition point with varied holding times and cooling rates. The fracture surface, grain size, and recrystallized microstructure were characterized...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/10356/168716 |
| _version_ | 1811680321900380160 |
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| author | Li, Zhiqiang Gill, Vincent Lambourne, Alexis Dong, Zhili Avdeev, Maxim Oh, Joo Tien Chen, Zhong |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Li, Zhiqiang Gill, Vincent Lambourne, Alexis Dong, Zhili Avdeev, Maxim Oh, Joo Tien Chen, Zhong |
| author_sort | Li, Zhiqiang |
| collection | NTU |
| description | The effect of heat treatment on the mechanical properties of FeCo-2V alloy was investigated at temperatures slightly above and below its order-disorder transition point with varied holding times and cooling rates. The fracture surface, grain size, and recrystallized microstructure were characterized by SEM and EBSD. The correlation between yield strength and microstructural features was analysed. Yield strength was found to decrease with the elevation of heating temperature, extension of holding time, and decrease in cooling rate. Fast cooling significantly improved the mechanical strength and ductility. The quenched samples exhibited microscopically ductile fracture features with shallow dimples on the fractured surface, while the slow-cooled ones displayed brittle microscopic fracture features, regardless of the heating temperature and holding time. The yield strength follows two separate Hall-Petch relationships for samples dominantly in the ordered and disordered states. Our analyses reveal that the mechanical strength of FeCo-2V alloy is mainly controlled by the grain size, thus it is important to regulate the grain recrystallization and growth during the heat treatment process. |
| first_indexed | 2024-10-01T03:23:12Z |
| format | Journal Article |
| id | ntu-10356/168716 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:23:12Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1687162023-07-14T15:54:28Z Mechanical properties and fractographic analyses of FeCo-2V alloy heat-treated around order-disorder transition temperature Li, Zhiqiang Gill, Vincent Lambourne, Alexis Dong, Zhili Avdeev, Maxim Oh, Joo Tien Chen, Zhong School of Materials Science and Engineering Rolls-Royce@NTU Corporate Lab Engineering::Materials Heat Treatment Mechanical Strength The effect of heat treatment on the mechanical properties of FeCo-2V alloy was investigated at temperatures slightly above and below its order-disorder transition point with varied holding times and cooling rates. The fracture surface, grain size, and recrystallized microstructure were characterized by SEM and EBSD. The correlation between yield strength and microstructural features was analysed. Yield strength was found to decrease with the elevation of heating temperature, extension of holding time, and decrease in cooling rate. Fast cooling significantly improved the mechanical strength and ductility. The quenched samples exhibited microscopically ductile fracture features with shallow dimples on the fractured surface, while the slow-cooled ones displayed brittle microscopic fracture features, regardless of the heating temperature and holding time. The yield strength follows two separate Hall-Petch relationships for samples dominantly in the ordered and disordered states. Our analyses reveal that the mechanical strength of FeCo-2V alloy is mainly controlled by the grain size, thus it is important to regulate the grain recrystallization and growth during the heat treatment process. National Research Foundation (NRF) Published version This work was conducted within the Rolls-Royce@NTU Corporate Lab with support from the Industry Alignment Fund (IAF) from Singapore Research Foundation under the Corp Lab@University Scheme. 2023-06-16T04:24:25Z 2023-06-16T04:24:25Z 2023 Journal Article Li, Z., Gill, V., Lambourne, A., Dong, Z., Avdeev, M., Oh, J. T. & Chen, Z. (2023). Mechanical properties and fractographic analyses of FeCo-2V alloy heat-treated around order-disorder transition temperature. Journal of Materials Research and Technology, 22, 3302-3310. https://dx.doi.org/10.1016/j.jmrt.2022.12.142 2238-7854 https://hdl.handle.net/10356/168716 10.1016/j.jmrt.2022.12.142 2-s2.0-85145964358 22 3302 3310 en Journal of Materials Research and Technology © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/). application/pdf |
| spellingShingle | Engineering::Materials Heat Treatment Mechanical Strength Li, Zhiqiang Gill, Vincent Lambourne, Alexis Dong, Zhili Avdeev, Maxim Oh, Joo Tien Chen, Zhong Mechanical properties and fractographic analyses of FeCo-2V alloy heat-treated around order-disorder transition temperature |
| title | Mechanical properties and fractographic analyses of FeCo-2V alloy heat-treated around order-disorder transition temperature |
| title_full | Mechanical properties and fractographic analyses of FeCo-2V alloy heat-treated around order-disorder transition temperature |
| title_fullStr | Mechanical properties and fractographic analyses of FeCo-2V alloy heat-treated around order-disorder transition temperature |
| title_full_unstemmed | Mechanical properties and fractographic analyses of FeCo-2V alloy heat-treated around order-disorder transition temperature |
| title_short | Mechanical properties and fractographic analyses of FeCo-2V alloy heat-treated around order-disorder transition temperature |
| title_sort | mechanical properties and fractographic analyses of feco 2v alloy heat treated around order disorder transition temperature |
| topic | Engineering::Materials Heat Treatment Mechanical Strength |
| url | https://hdl.handle.net/10356/168716 |
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