超声深滚降低TC4钛合金表面粗糙度和修复表面损伤的作用

Influence of Ultrasonic Deep Rolling on Reducing Surface Roughness and Healing Surface Scar of TC4 Titanium Alloy

摘要:

在TC4钛合金表面制备线形和圆形的模拟缺口，定量分析研究超声深滚处理降低TC4钛合金表面粗糙度和修复表面损伤的作用。采用TR240表面粗糙度仪测试超声深滚处理前后的表面粗糙度，采用Quant 200扫描电子显微镜(SEM)对处理前后表面进行观察分析。结果表明，超声深滚处理可以使粗磨状态的TC4合金的表面粗糙度由Ra 2.32 μm降低到Ra 0.11 μm，有效修复线形和圆形的模拟损伤。分析讨论了表面状态的改善对于恢复和提高老旧零件疲劳性能的作用

Abstract:

In order to evaluate the effects of ultrasonic deep rolling process on the reducing surface roughness and healing surface scar or micro-damage, some line type surface notches and pit like surface caves were prepared and followed by ultrasonic deep rolling treatment on Ti-6Al-4V plate to simulate the foreign object damage. The surface roughness and geometry were evaluated by a surface profile tester and SEM observation for both the treated and untreated specimens. Results show that the surface roughness of the specimen can be reduced from Ra 2.32 μm to 0.11 μm by the ultrasonic deep rolling process. Some line type surface notches and pit like surface caves were significantly attenuated. The above results are expected to improve the anti-fatigue performance of parts effectively or to restore the fatigue resistance of the FOD damaged surface