| Mechanism of Dynamic Strain-Induced Ferrite Transformation in a 3Mn-0.2C Medium Mn Steel | |
| Sun Yi1,2; Zheng Qinyuan2,3; Hu Baojia2,3; Wang Ping1; Zheng Chengwu2,3; Li Dianzhong2,3 | |
| Corresponding Author | Wang Ping(wping@epm.neu.edu.cn) ; Zheng Chengwu(cwzheng@imr.ac.cn) |
| 2022-05-01 | |
| Source Publication | ACTA METALLURGICA SINICA
 |
| ISSN | 0412-1961 |
| Volume | 58Issue:5Pages:649-659 |
| Abstract | Medium Mn steels (MMSs) have Mn contents of 3%-12% (mass fraction), and have been energetically investigated as the most promising candidates of the third-generation advanced high-strength steel. Their phase transformations and microstructures during various heat treatments and thermomechanical processes have received wide attention with the purpose to achieve an optimal balance of cost-efficient alloying compositions and mechanical properties. The aim of this work is to investigate the microstructural behavior of deformation-induced ferrite transformation (DIFT), starting from austenite, which occurs in MMS. Then, improved understandings of the formation of ultrafine ferrite via the DIFT and conservation of this microstructure during the post-deformation period can be obtained. For this purpose, a 3Mn-0.2C MMS with lower contents of alloying elements was selected. Microstructures and alloying element distributions of the thermomechanically processed samples were analyzed via EBSD and EPMA. The results showed that the DIFT occurred in the thermomechanically processed 3Mn-0.2C MMS in the alpha + gamma region. Characteristic multiphase microstructures consisting isolated martensite and fine-grained equiaxed ferrite concomitant with fine islands of retained austenite dispersed between ferrite grains can be obtained. During the DIFT, the enhanced nucleation of ferrite at alpha/gamma interfaces can not only increase the ferrite nucleation density but also facilitate extensive impingement among the neighboring grains. Formation of ultrafine ferrite via the DIFT in MMS can be interpreted in terms of unsaturated nucleation and limited growth. In addition, partitioning of Mn between the ultrafine ferrite and austenite is accelerated during the DIFT such that a large number of Mn-enriched fine islands of austenite are left untransformed at the alpha/alpha grain boundaries or at triple junctions. These islands of austenite are considered to play critical roles not only for obtaining retained austenite at room temperature but also for conserving the ultrafine microstructure of the DIFT during the post-deformation processing. |
| Keyword | hot deformation ultra-fine grained ferrite Mn partitioning deformation induced ferrite transformation medium Mn steel |
| Funding Organization | National Natural Science Foundation of China |
| DOI | 10.11900/0412.1961.2021.00192 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[52071322] ; National Natural Science Foundation of China[51771192] ; National Natural Science Foundation of China[U1708252] |
| WOS Research Area | Metallurgy & Metallurgical Engineering |
| WOS Subject | Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000787207700006 |
| Publisher | SCIENCE PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/172720 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Wang Ping; Zheng Chengwu |
| Affiliation | 1.Northeastern Univ, Key Lab Electromagnet Proc Mat, Minist Educ, Shenyang 110819, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China |
| Recommended Citation GB/T 7714 | Sun Yi,Zheng Qinyuan,Hu Baojia,et al. Mechanism of Dynamic Strain-Induced Ferrite Transformation in a 3Mn-0.2C Medium Mn Steel[J]. ACTA METALLURGICA SINICA,2022,58(5):649-659. |
| APA | Sun Yi,Zheng Qinyuan,Hu Baojia,Wang Ping,Zheng Chengwu,&Li Dianzhong.(2022).Mechanism of Dynamic Strain-Induced Ferrite Transformation in a 3Mn-0.2C Medium Mn Steel.ACTA METALLURGICA SINICA,58(5),649-659. |
| MLA | Sun Yi,et al."Mechanism of Dynamic Strain-Induced Ferrite Transformation in a 3Mn-0.2C Medium Mn Steel".ACTA METALLURGICA SINICA 58.5(2022):649-659. |
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