Superior Strength and Multiple Strengthening Mechanisms in Nanocrystalline TWIP Steel.

Autor: Kim JG; Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea., Enikeev NA; Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa, 450000, Russia.; Saint Petersburg State University, St. Petersburg, 198504, Russia., Seol JB; National Institute of Nanomaterials Technology (NINT), POSTECH, Pohang, 37673, South Korea., Abramova MM; Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa, 450000, Russia., Karavaeva MV; Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa, 450000, Russia., Valiev RZ; Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa, 450000, Russia.; Saint Petersburg State University, St. Petersburg, 198504, Russia., Park CG; Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea.; National Institute of Nanomaterials Technology (NINT), POSTECH, Pohang, 37673, South Korea., Kim HS; Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea. hskim@postech.ac.kr.; Center for High Entropy Alloys, POSTECH, Pohang, 37673, South Korea. hskim@postech.ac.kr.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2018 Jul 25; Vol. 8 (1), pp. 11200. Date of Electronic Publication: 2018 Jul 25.
DOI: 10.1038/s41598-018-29632-y
Abstrakt: The strengthening mechanism of the metallic material is related to the hindrance of the dislocation motion, and it is possible to achieve superior strength by maximizing these obstacles. In this study, the multiple strengthening mechanism-based nanostructured steel with high density of defects was fabricated using high-pressure torsion at room and elevated temperatures. By combining multiple strengthening mechanisms, we enhanced the strength of Fe-15 Mn-0.6C-1.5 Al steel to 2.6 GPa. We have found that solute segregation at grain boundaries achieves nanograined and nanotwinned structures with higher strength than the segregation-free counterparts. The importance of the use of multiple deformation mechanism suggests the development of a wide range of strong nanotwinned and nanostructured materials via severe plastic deformation process.
Databáze: MEDLINE
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