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Effect of grain boundary sliding on the toughness of ultrafine grain structure steel: a molecular dynamics simulation study |
| Xie Hong-Xian (谢红献)a, Liu Bo (刘波)a, Yin Fu-Xing (殷福星)b, Yu Tao (于涛)c |
a School of Mechanical Engineering, Hebei University of Technology, Tianjin 300132, China;
b Materials Research Institute for Energy Equipments, China First Heavy Industries, China;
c Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract Molecular dynamics simulations are carried out to investigate the mechanisms of low-temperature impact toughness of the ultrafine grain structure steel. The simulation results suggest that the sliding of the {001}/{110} type and {110}/{111} type grain boundary can improve the impact toughness. Then, the mechanism of grain boundary sliding is studied and it is found that the motion of dislocations along the grain boundary is the underlying cause of the grain boundary sliding. Finally, the sliding of the grain boundary is analysed from the standpoint of the energy. We conclude that the measures which can increase the quantity of the {001}/{110} type and {110}/{111} type grain boundary and elongate the free gliding distance of dislocations along these grain boundaries will improve the low-temperature impact toughness of the ultrafine grain structure steel.
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Received: 10 June 2012
Revised: 26 June 2012
Accepted manuscript online:
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PACS:
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02.70.Ns
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(Molecular dynamics and particle methods)
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83.60.Uv
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(Wave propagation, fracture, and crack healing)
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61.72.Ff
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(Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.))
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Corresponding Authors:
Xie Hong-Xian
E-mail: hongxianxie@163.com
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Cite this article:
Xie Hong-Xian (谢红献), Liu Bo (刘波), Yin Fu-Xing (殷福星), Yu Tao (于涛) Effect of grain boundary sliding on the toughness of ultrafine grain structure steel: a molecular dynamics simulation study 2013 Chin. Phys. B 22 010204
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