Effect of grain boundary sliding on the toughness of ultrafine grain structure steel: A molecular dynamics simulation study
HX Xie and B Liu and FX Yin and T Yu, CHINESE PHYSICS B, 22, 010204 (2013).
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 analyzed 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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