Journal
MATERIALS RESEARCH LETTERS
Volume 5, Issue 1, Pages 61-68Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2016.1208301
Keywords
Dynamic transformation; dynamic recrystallization; ultrafine-grained ferrite; grain refinement; thermomechanically controlled process
Categories
Funding
- Elements Strategy Initiative for Structural Materials (ESISM)
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- China Scholarship Council, China [2011608007]
- [2201]
- [15H05767]
- [26630365]
- Grants-in-Aid for Scientific Research [15H05767] Funding Source: KAKEN
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Two novel two-step thermomechanical routes were developed to produce ultrafine-grained ferrite microstructures in a 10Ni-0.1C steel without high-strain deformation. Homogeneous ultrafine ferrite (UFF) structures having mean grain sizes down to 460 nm were fabricated by a total equivalent strain of 0.92 and exhibited high yield strength of 820 MPa with large uniform elongation of 10% and total elongation of 29%. The formation of UFF was attributed to two different phenomena, i.e. dynamic transformation from austenite to ferrite and dynamic recrystallization of ferrite. [GRAPHICS] IMPACT STATEMENT Ultragrain refinement and remarkable strength-ductility properties can be achieved by controlling dynamic transformation and recrystallization in a thermomechanically controlled process without high-strain deformation.
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