Localized amorphism after high-strain-rate deformation in TWIP steel

The microstructural features of shear localization, generated by a high-strain-rate deformation (∼105s−1), of a twinning-induced plasticity (TWIP) steel containing about 17.5wt.% Mn were well characterized by means of optical microscopy, transmission electron microscopy and electron backscatter diff...

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Bibliographic Details
Published in:Acta materialia 2011-09, Vol.59 (16), p.6369-6377
Main Authors: Li, N., Wang, Y.D., Lin Peng, R., Sun, X., Liaw, P.K., Wu, G.L., Wang, L., Cai, H.N.
Format: Article
Language:English
Subjects:
Amorphous
Applied sciences
Cooling
Deformation
Exact sciences and technology
Metals. Metallurgy
Microstructure
Nanocrystal
Nanocrystals
Phase transformations
Shear band
Sheet metal
Slip bands
Steels
Strain rate
TECHNOLOGY
TEKNIKVETENSKAP
TWIP steel
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Summary:The microstructural features of shear localization, generated by a high-strain-rate deformation (∼105s−1), of a twinning-induced plasticity (TWIP) steel containing about 17.5wt.% Mn were well characterized by means of optical microscopy, transmission electron microscopy and electron backscatter diffraction. The high deformation rate was obtained by a ballistic impact penetration test on the TWIP steel sheet. In addition to the deformation twins observed as the main microstructural characterization in the matrix, some shear bands consisting of complex microstructures were also evidenced in the highly deformed area. Inside the shear band, there exist a large region of amorphous phase and a smooth transition zone that also contains nanocrystalline phases. The grain size decreases gradually in the transition zone, changing from a coarse scale (>100nm) to a fine scale (
ISSN:1359-6454
1873-2453
1873-2453
DOI:10.1016/j.actamat.2011.06.048