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Grain Size Effect on the Mechanical Behavior of Metastable Fe-23Cr-8.5Ni Alloy

1
School of Engineering and Technology, Zunyi Normal University, Zunyi 563006, China
2
International Joint Laboratory for Light Alloys (MOE), College of Material Science and Engineering, Chongqing University, Chongqing 400044, China
3
State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
4
National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China
5
Department of Mechanical Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(7), 734; https://doi.org/10.3390/met9070734
Received: 3 June 2019 / Revised: 19 June 2019 / Accepted: 25 June 2019 / Published: 29 June 2019
(This article belongs to the Special Issue Advances in Ultrafine-Grained Metals Research)
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Abstract

An Fe-23Cr-8.5Ni alloy was used as a model material to study the grain size effect on the mechanical behavior of metastable duplex metal. Alloy samples with different grain sizes ranging from 0.1 to 2 μm were prepared by cold-rolling and annealing. A structural refinement to about 0.1 μm results in a high yield strength but very limited ductility. A significant improvement of ductility occurred at the grain size of about 0.4 μm. A further increase in grain size results in a decreased strength and a slightly improved ductility. The alloy with a grain size of about 0.4 μm exhibits an excellent combination of strength and ductility, where the yield strength and tensile elongation are increased up to 738 MPa and 29% as compared to 320 MPa and 33% of a coarse-grained (about 2 μm) sample, respectively. The origin of the excellent mechanical properties was attributed to the unique deformation characteristics associated with the transformation induced plasticity and the development of back stress. View Full-Text
Keywords: mechanical properties; metastable; back stress; grain size mechanical properties; metastable; back stress; grain size
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Xie, L.; Wang, C.; Wang, Y.; Wu, G.; Huang, X. Grain Size Effect on the Mechanical Behavior of Metastable Fe-23Cr-8.5Ni Alloy. Metals 2019, 9, 734.

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