期刊
SCRIPTA MATERIALIA
卷 165, 期 -, 页码 44-49出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.02.017
关键词
Thermomechanical processing; Ferritic steels; Neutron diffraction; Dynamic recrystallization; Dynamic ferrite transformation
类别
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [15H05767, 15K14163]
- Elements Strategy Initiative for Structural Materials (ESISM) through the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Grants-in-Aid for Scientific Research [15K14163] Funding Source: KAKEN
Nowadays, a new concept of process utilizing dynamic ferrite transformation, which can achieve ultrafinegrained structure with a mean grain size of approximately 1 mu m, has been proposed. This paper reports transformation mode of dynamic ferrite transformation and formation mechanism of ultrafine-grained structure revealed by our novel technique of in-situ neutron diffraction analysis during thermomechanical processing. Dynamic ferrite transformation occurs in a diffusional manner, whose partitioning behavior changes from para- to ortho-equilibrium with the progress of transformation. Moreover, we propose that dynamic recrystallization of dynamically-transformed ferrite is the main mechanism for the formation of ultrafine-grained structure. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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