Effect of stacking fault energy on formation of deformation twin in high Mn austenitic steel

Indenter size effect on the reversible incipient plasticity of Al (001) surface is studied by quasicontinuum simulations. Two cylindrical indenters with the radii 2.5nm and 17.5nm are used to penetrate the surface respectively, in displacement-control in steps of 0.02 nm. Results show that the plasticity under the small indenter is reversible, since it is dominated by the nucleation of a thin deformation twin, which can be fully removed after withdrawal of the indenter, due to the imaging force and stacking fault energy. Under the large indenter, multiple slip systems are activated simultaneously when incipient plasticity occurs, a few twin, dislocation and stacking fault ribbons still remain under the surface when the indenter has been completely retracted, thus the plasticity is irreversible.

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Grain size effect on deformation twin thickness in a nanocrystalline metal with low stacking-fault energy

Journal of Materials Research ◽

10.1557/jmr.2019.194 ◽

2019 ◽

Vol 34 (13) ◽

pp. 2398-2405

Author(s):

Yusheng Li ◽

Liangjuan Dai ◽

Yang Cao ◽

Yonghao Zhao ◽

Yuntian Zhu

Keyword(s):

Grain Size ◽

Size Effect ◽

Deformation Twin ◽

Stacking Fault ◽

Stacking Fault Energy ◽

Grain Size Effect ◽

Nanocrystalline Metal ◽

Image Position ◽

Twin Thickness

Abstract

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Stacking Fault Energy in the Austenitic Steel CrMnNiN / Stapelfehlerenergie im austenitischen Stahl CrMnNiN

Practical Metallography ◽

10.1515/pm-1972-091204 ◽

1972 ◽

Vol 9 (12) ◽

pp. 686-698

Author(s):

Antonin Gemperle ◽

Irena Kasova ◽

Vladimir Cihal

Keyword(s):

Austenitic Steel ◽

Stacking Fault ◽

Stacking Fault Energy

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Deformation-induced martensitic transformation in a 201 austenitic steel: The synergy of stacking fault energy and chemical driving force

Materials Science and Engineering A ◽

10.1016/j.msea.2015.12.006 ◽

2016 ◽

Vol 653 ◽

pp. 147-152 ◽

Cited By ~ 25

Author(s):

M. Moallemi ◽

A. Kermanpur ◽

A. Najafizadeh ◽

A. Rezaee ◽

H. Samaei Baghbadorani ◽

...

Keyword(s):

Martensitic Transformation ◽

Austenitic Steel ◽

Driving Force ◽

Stacking Fault ◽

Stacking Fault Energy

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Deformation Microstructure and Texture in a Cold-Rolled Austenitic Steel with Low Stacking-Fault Energy

MATERIALS TRANSACTIONS ◽

10.2320/matertrans.mg200901 ◽

2010 ◽

Vol 51 (4) ◽

pp. 620-624 ◽

Cited By ~ 17

Author(s):

Tatsuya Morikawa ◽

Kenji Higashida

Keyword(s):

Austenitic Steel ◽

Stacking Fault ◽

Stacking Fault Energy ◽

Deformation Microstructure ◽

Cold Rolled

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A correlation between grain boundary character and deformation twin nucleation mechanism in coarse-grained high-Mn austenitic steel

Scientific Reports ◽

10.1038/s41598-021-87811-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Chang-Yu Hung ◽

Yu Bai ◽

Tomotsugu Shimokawa ◽

Nobuhiro Tsuji ◽

Mitsuhiro Murayama

Keyword(s):

Grain Boundary ◽

Grain Boundaries ◽

Austenitic Steel ◽

Deformation Twin ◽

Local Stress ◽

Nucleation Mechanism ◽

Stacking Fault ◽

Dislocation Dynamics ◽

Coarse Grained ◽

Twin Nucleation

AbstractIn polycrystalline materials, grain boundaries are known to be a critical microstructural component controlling material’s mechanical properties, and their characters such as misorientation and crystallographic boundary planes would also influence the dislocation dynamics. Nevertheless, many of generally used mechanistic models for deformation twin nucleation in fcc metal do not take considerable care of the role of grain boundary characters. Here, we experimentally reveal that deformation twin nucleation occurs at an annealing twin (Σ3{111}) boundary in a high-Mn austenitic steel when dislocation pile-up at Σ3{111} boundary produced a local stress exceeding the twining stress, while no obvious local stress concentration was required at relatively high-energy grain boundaries such as Σ21 or Σ31. A periodic contrast reversal associated with a sequential stacking faults emission from Σ3{111} boundary was observed by in-situ transmission electron microscopy (TEM) deformation experiments, proving the successive layer-by-layer stacking fault emission was the deformation twin nucleation mechanism, different from the previously reported observations in the high-Mn steels. Since this is also true for the observed high Σ-value boundaries in this study, our observation demonstrates the practical importance of taking grain boundary characters into account to understand the deformation twin nucleation mechanism besides well-known factors such as stacking fault energy and grain size.

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