Effect of grain boundary sliding on the toughness of ultrafine grain structure steel: A molecular dynamics simulation study

被引：1
|
作者：
谢红献 [1 ]
刘波 [1 ]
殷福星 [2 ]
于涛 [3 ]
机构：
[1] School of Mechanical Engineering, Hebei University of Technology
[2] Materials Research Institute for Energy Equipments, China First Heavy Industries
[3] Central Iron and Steel Research Institute
来源：
Chinese Physics B | 2013年 / 22卷 / 01期
关键词：
molecular dynamics simulations; grain boundary; crack; ultrafine grain structure steel;
D O I：
暂无
中图分类号：
TG142.41 [结构钢];
学科分类号：
080502 ;
摘要：
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.
引用
收藏
页码：54 / 61
页数：8
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