摘要
用系统分析的方法定义疲劳损伤参数,通过三点弯曲疲劳试验,结合扫描电镜等观测手段,定量跟踪了三种表面处理镀层在循环载荷作用下疲劳损伤的产生与发展过程。试验结果表明:在循环加载过程中,因基体材料产生表面滑移塑性变形,三种表面处理镀层都以不断开裂的损伤方式发展。磷化膜层表现为在比较长的循环周期里产生连续的疲劳损伤过程;晶化镍磷化学镀层和铁镍磷合金电镀层则在较短的循环周期里大规模开裂,磷化膜在疲劳损伤过程中呈现出一定的韧性。试验结果还显示:三种表面处理层都是在循环载荷作用到一定的循环周数才开始开裂,说明表面处理层都有一定的疲劳强度。
The effects of phosphate coating,electoless Ni-P coating heat treated at 400℃ and electrodeposited Fe-Ni-P alloy coating on fatigue property have been examined by three-point cyclic bending test. The damage processs of the surface-treating coatings has been investigated by system analysis method. The results reveal that the fatigue damage of the phosphate coating is a continual process and the fatigue damage of electoless Ni-P coating and electrodeposited Fe-Ni-P alloy coating are a short process. The results also show that the crack of coatings initiates when the slip bands occur on the surface of base steel, and the system analysis method is effective in the surface fatigue damage detecting.
出处
《航空材料学报》
EI
CAS
CSCD
2005年第5期59-62,共4页
Journal of Aeronautical Materials
关键词
系统分析
表面处理
疲劳损伤
system analysis
surface-treating
fatigue damage
