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タイトル: Combination of dynamic transformation and dynamic recrystallization for realizing ultrafine-grained steels with superior mechanical properties
著者: Zhao, Lijia
Park, Nokeun
Tian, Yanzhong
Shibata, Akinobu
Tsuji, Nobuhiro
著者名の別形: 趙, 立佳
朴, 魯謹
田, 艶中
柴田, 曉伸
辻, 伸泰
発行日: 14-Dec-2016
出版者: Springer Nature
誌名: Scientific Reports
巻: 6
論文番号: 39127
抄録: Dynamic recrystallization (DRX) is an important grain refinement mechanism to fabricate steels with high strength and high ductility (toughness). The conventional DRX mechanism has reached the limitation of refining grains to several microns even though employing high-strain deformation. Here we show a DRX phenomenon occurring in the dynamically transformed (DT) ferrite, by which the required strain for the operation of DRX and the formation of ultrafine grains is significantly reduced. The DRX of DT ferrite shows an unconventional temperature dependence, which suggests an optimal condition for grain refinement. We further show that new strategies for ultra grain refinement can be evoked by combining DT and DRX mechanisms, based on which fully ultrafine microstructures having a mean grain size down to 0.35 microns can be obtained without high-strain deformation and exhibit superior mechanical properties. This study will open the door to achieving optimal grain refinement to nanoscale in a variety of steels requiring no high-strain deformation in practical industrial application.
記述: 鉄鋼材料の簡便なプロセスによる結晶粒超微細化原理を発見 : 動的相変態と動的再結晶による高強度・高延性バルクナノ鉄鋼の実現. 京都大学プレスリリース. 2016-12-15.
著作権等: © The Author(s) 2016. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
URI: http://hdl.handle.net/2433/217608
DOI(出版社版): 10.1038/srep39127
関連リンク: http://www.kyoto-u.ac.jp/ja/research/research_results/2016/161214_1.html
出現コレクション:学術雑誌掲載論文等

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