摘要
通过分离残余应力效应及表面滑移带和显微亚结构的观察，探讨了喷丸形变组织对纯铜及黄铜疲劳裂纹萌生的阻碍作用，指出虽无残余压应力的作用，试件表层的喷丸组织亦可阻碍心部位错滑移出表面，并使形变层的位错运动限定在胞状位错和栅栏状孪晶内，从而有效地减小滑移带在材料表面造成的挤出挤入损伤．
Effect of deformed structure by shot peening on retardation of fatigue crack initiation in Cu or brass has been investigated via separation from residual stress effect and under observation on surface slip band and microsubstructure.The structure of shot peened layer on specimen may retard the dislocation movement by slip outward from the core to surface,and limit the dislocation movement of deformed layer within the cellular dislocation of Cu or paling twins of brass.Thus,the fatigue damage of intrusion and extrusion type caused by the slip band on surface may be effectively reduced.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第1期A029-A034,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金
关键词
疲劳
喷丸
残余应力
铜
黄铜
shot peening,microstructure,residual stress,fatigue,copper,brass
