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  Suppression of twinning and phase transformation in an ultrafine grained 2 GPa strong metastable austenitic steel: Experiment and simulation

Shen, Y., Jia, N., Wang, Y. D., Sun, X., Zuo, L., & Raabe, D. (2015). Suppression of twinning and phase transformation in an ultrafine grained 2 GPa strong metastable austenitic steel: Experiment and simulation. Acta Materialia, 97: 12238, pp. 305-315. doi:10.1016/j.actamat.2015.06.053.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-5EC2-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-5EC3-1
Genre: Journal Article

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 Creators:
Shen, Yongfeng1, Author              
Jia, Nan2, Author              
Wang, Y. D.3, Author              
Sun, Xin4, Author              
Zuo, Liang1, Author              
Raabe, Dierk5, Author              
Affiliations:
1Key Laboratory for Anisotropy and Texture of Materials (MOE), Northeastern University, 3 Wenhua Road, Shenyang, China, ou_persistent22              
2Key Laboratory for Anisotropy and Texture of Materials (MOE), Northeastern University, Shenyang 110819, China, ou_persistent22              
3Key Laboratory for Anisotropy and Texture of Materials, MOE, Northeastern University, Shenyang, China, ou_persistent22              
4Computational Science and Mathematics Division, Pacific Northwest National Laboratory, Richland, WA, USA, ou_persistent22              
5Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              

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Free keywords: Twin; Ultrafine grain; Ultrahigh strength
 Abstract: Abstract An ultrafine-grained 304 austenitic 18 wt.% Cr-8 wt.% Ni stainless steel with a grain size of ∼270 nm was synthesized by accumulative rolling (67% total reduction) and annealing (550°C, 150 s). Uniaxial tensile testing at room temperature reveals an extremely high yield strength of 1890 ± 50 MPa and a tensile strength of 2050 ± 30 MPa, while the elongation reaches 6 ± 1%. Experimental characterization on samples with different grain sizes between 270 nm and 35 μm indicates that both, deformation twinning and martensitic phase transformation are significantly retarded with increasing grain refinement. A crystal plasticity finite element model incorporating a constitutive law reflecting the grain size-controlled dislocation slip and deformation twinning captures the micromechanical behavior of the steels with different grain sizes. Comparison of simulation and experiment shows that the deformation of ultrafine-grained 304 steels is dominated by the slip of partial dislocations, whereas for coarse-grained steels dislocation slip, twinning and martensite formation jointly contribute to the shape change. © 2015 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2015-07-15
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Tarrytown, NY : Pergamon
Pages: - Volume / Issue: 97 Sequence Number: 12238 Start / End Page: 305 - 315 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100