摘要
针对铁素体 珠光体钢中解理微裂纹的形成机理,用有限元方法计算了铁素体 珠光体组织细观尺度内应力应变的分布及其随外加宏观应力的变化.研究结果表明,铁素体内的等效应力σe和正应力σ11低于珠光体,但其等效塑性应变εep高于珠光体.在铁素体和珠光体中的等效塑性应变和正应力分布不均匀,在某些铁素体 珠光体边界处存在较高的塑性应变和正应力集中,在某些珠光体中也存在较大的正应力,从而使解理微裂纹易于在该处形核并长大.
In order to analyze the mechanism of cleavage microcrack forming in ferrite-pearlite steel,the distributions of stress and strain in mesoscopic size of ferrite-pearlite microstructure and their variation with applied stress are computed by using finite element method.The results show that the equivalent stress σe and the normal stress σ(11) in the ferrite are lower than that in the pearlite,but the equivalent plastic strain εep in the ferrite is higher.The distributions of the equivalent plastic strain and the normal stress in the ferrite-pearlite microstructure are not-uniform.The higher concentrations of ε(ep) and σ(11) exist on the boundary between the ferrite and pearlite,and the higher σ(11) exists in pearlite.This makes the cleavage microcracks easy to nucleate and growth on that boundary and within pearlite.
出处
《兰州理工大学学报》
CAS
北大核心
2004年第5期1-4,共4页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(59871015)
关键词
应力
应变
铁素体
珠光体
微裂纹
有限元
stress
strain
ferrite
pearlite
micro-crack
finite element
