MOLECULAR DYNAMIC SIMULATION OF MICROSTRUCTURE EVOLUTION AND DEFORMATION MECHANISM FOR X80 STEEL

摘要：

X80 steel which was used in buried gaspipeline mainly consists of ferrite and pearlite.Experiments show that two kinds of micro defects exist inevitably in the manufacturing process of X80 steel including the micro-void and micro-crack,which affect the mechanical properties of X80 steel significantly.In this study,the deformation and failure processes of the composition of X80 steel near defects at atomic scale level were examined by means of molecular dynamics (MD) simulation.The EAM/FS potential is employed to characterize the interatomic interactions of the composition of X80 specimens.The deformation and failure processes of single crystal structures for a-Fe,Fe3C and the Fe3C-Fe interface are observed around the crack.The results reveal that microstructure evolution and deformation mechanism under external loading are correlated with crystal structure and crystal orientation intrinsically.

关键词： molecular dynamic simulation ferrite cementite defects

作者: R.P.Xu X.G Zeng A.L.Yao W.B.Xu H.Y.Chen

作者单位: College of Architecture and Environment,Sichuan University,Chengdu,SiChuan 610065,P.R.China Southwest Petroleum University,Chengdu SiChuan 610500,P.R.China

会议类型: 国际会议

会议名称: The Third International Conference on Heterogeneous Material Mechanics(第三届国际非均匀材料力学会议)

会议地点: 上海

会议语种:英文

页码: 128-131

在线出版日期: 2011-05-22（万方平台首次上网日期，不代表论文的发表时间）