摘要
本文利用透射电子显微分析和x射线内应力测定等方法研究了低层错能面心立方合金表面喷丸强化后组织结构变化与疲劳行为之间的关系。着重观察和分析了疲劳过程中强化层内亚结构和内应力的变化情况。结果表明:层错能很低的面心立方合金(不锈钢和α黄铜)经喷丸强化后,表层中存在大量显微变形孪晶;由孪晶构成的栅栏薄层不仅能使表层残余压应力在疲劳应力作用下维持稳定,而且能有效地防止疲劳裂纹在外表面形核,因此,栅栏强化效应是面心立方合金疲劳强度提高的主要原因。
The relationship between substructure change and fatigue behavior for the
shot peened f. c. c. alloys with low stacking fault energy is investigated by
transmission electron microscopy and x-ray residual stress analysis. After thso
peening the microdeformation twins are introduced into the strengthened layer
of the alloys. In fatigue process the twin paling can keep residual stress from
relaxation and hold off the nucleation of fatigue crack. The increase of bending
fatigue strength through shot peening can be explained by the paling effect of
miorotwins.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
1989年第4期53-58,共6页
Journal of Xi'an Jiaotong University
