摘要
采用一种超声深滚与滚光一体化的抗疲劳制造技术对钛合金疲劳试件进行表面强化处理。对经处理和未经处理的疲劳试件进行旋转弯曲疲劳试验。对疲劳试验后的试件断口进行扫描电镜观察分析。结果表明,超声深滚强化可以大幅提高钛合金试件的疲劳强度。强化后的试件表面形成一个组织致密层,起到抑制疲劳裂纹萌生和扩展的作用。对疲劳条纹的对比分析表明,超声深滚处理后的试件断口疲劳条纹明显细密化。
An integrated ultrasonic deep rolling and burnishing technology for anti-fatigue manufacturing is used for surface enhancement treatment of titanium alloy fatigue specimens. Rotating bending fatigue tests are performed for treated and untreated fatigue specimens. The fatigue fracture of cracked specimens is observed and investigated via scanning electronic microscopy. Results show that ultrasonic deep rolling treatment leads to substantial increase in fatigue strength of the titanium alloy specimens. A thin layer of fine microstrucmre is developed on the surface of the treated specimen which serves for inhibition of fatigue crack initiation and propagation. Comparisons of the fatigue striations indicate that the ultrasonic deep rolling treated specimens show obvious finer fatigue striation than those of the untreated specimen.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2009年第9期183-186,共4页
Journal of Mechanical Engineering
基金
北京市自然科学基金资助项目(3093027)
关键词
超声深滚
机械表面强化
疲劳条纹
Ultrasonic deep rolling Mechanical surface enhancement Fatigue striation
