An in situ synchrotron X-ray study of reverse austenitic transformation in a metastable FeMnCo alloy
Abstract This study concerns reverse austenitic transformation of plastic strain-induced hexagonal close-packed martensite. With the aid of in situ synchrotron X-ray diffractometry, the kinetic features of the transformation and the defect content evolution in a metastable (Fe60Mn40)85C...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Springer International Publishing
2022
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| Online Access: | https://hdl.handle.net/1721.1/146759 |
| _version_ | 1826188558118944768 |
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| author | Wei, Shaolou Kang, Jiyun Tasan, Cemal C. |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Wei, Shaolou Kang, Jiyun Tasan, Cemal C. |
| author_sort | Wei, Shaolou |
| collection | MIT |
| description | Abstract
This study concerns reverse austenitic transformation of plastic strain-induced hexagonal close-packed martensite. With the aid of in situ synchrotron X-ray diffractometry, the kinetic features of the transformation and the defect content evolution in a metastable (Fe60Mn40)85Co15 alloy are quantitatively examined using 5, 20, and 100 °C/min heating rates. It is found that the reverse austenitic transformation can be activated below 200 °C and completes within a short time scale. Through a Kissinger-style kinetic analysis, the activation energy of the reverse austenitic transformation is determined as 171.38 kJ/mol, confirming its displacive nature. Although exponential attenuation is observed in both stacking fault probability and dislocation density upon the initiation of the transformation, the resulting microstructure (single-phase face-centered cubic structure) remains highly defected, exhibiting high Vickers hardness, but still preserving somewhat strain hardenability. Atomistic mechanisms for the reverse austenitic transformation are further conceived according to the crystallographic theory of martensitic transformation.
Graphical abstract |
| first_indexed | 2024-09-23T08:01:16Z |
| format | Article |
| id | mit-1721.1/146759 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:01:16Z |
| publishDate | 2022 |
| publisher | Springer International Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1467592023-07-05T20:14:18Z An in situ synchrotron X-ray study of reverse austenitic transformation in a metastable FeMnCo alloy Wei, Shaolou Kang, Jiyun Tasan, Cemal C. Massachusetts Institute of Technology. Department of Materials Science and Engineering Abstract This study concerns reverse austenitic transformation of plastic strain-induced hexagonal close-packed martensite. With the aid of in situ synchrotron X-ray diffractometry, the kinetic features of the transformation and the defect content evolution in a metastable (Fe60Mn40)85Co15 alloy are quantitatively examined using 5, 20, and 100 °C/min heating rates. It is found that the reverse austenitic transformation can be activated below 200 °C and completes within a short time scale. Through a Kissinger-style kinetic analysis, the activation energy of the reverse austenitic transformation is determined as 171.38 kJ/mol, confirming its displacive nature. Although exponential attenuation is observed in both stacking fault probability and dislocation density upon the initiation of the transformation, the resulting microstructure (single-phase face-centered cubic structure) remains highly defected, exhibiting high Vickers hardness, but still preserving somewhat strain hardenability. Atomistic mechanisms for the reverse austenitic transformation are further conceived according to the crystallographic theory of martensitic transformation. Graphical abstract 2022-12-05T18:26:17Z 2022-12-05T18:26:17Z 2022-11-29 2022-12-04T04:11:57Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/146759 Wei, Shaolou, Kang, Jiyun and Tasan, Cemal C. 2022. "An in situ synchrotron X-ray study of reverse austenitic transformation in a metastable FeMnCo alloy." PUBLISHER_CC en https://doi.org/10.1557/s43578-022-00818-5 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer International Publishing Springer International Publishing |
| spellingShingle | Wei, Shaolou Kang, Jiyun Tasan, Cemal C. An in situ synchrotron X-ray study of reverse austenitic transformation in a metastable FeMnCo alloy |
| title | An in situ synchrotron X-ray study of reverse austenitic transformation in a metastable FeMnCo alloy |
| title_full | An in situ synchrotron X-ray study of reverse austenitic transformation in a metastable FeMnCo alloy |
| title_fullStr | An in situ synchrotron X-ray study of reverse austenitic transformation in a metastable FeMnCo alloy |
| title_full_unstemmed | An in situ synchrotron X-ray study of reverse austenitic transformation in a metastable FeMnCo alloy |
| title_short | An in situ synchrotron X-ray study of reverse austenitic transformation in a metastable FeMnCo alloy |
| title_sort | in situ synchrotron x ray study of reverse austenitic transformation in a metastable femnco alloy |
| url | https://hdl.handle.net/1721.1/146759 |
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