K465高温合金叶片扰流柱的渗透检测

Penetrant testing of K465 high temperature alloy blade spoiler columns

针对某型号空心涡轮叶片叶尖和榫齿外侧扰流柱表面有荧光显示的问题,使用ZL-27A型渗透液对其进行渗透检测,后用丙酮擦拭笔对荧光显示进行擦拭,确定并标记出有缺陷的扰流柱;最后利用体视显微镜和扫描电镜观察和分析缺陷的宏观和微观特征。结果表明,扰流柱表面不平整是存在荧光显示的主要原因,经过擦拭后扰流柱上的线性荧光显示为裂纹,圆形荧光显示为疏松,缺陷是铸造工艺造成的;对于扰流柱位置有荧光显示的零件,应拒绝验收。

This paper analyzed the fluorescent indications problem on the surface of the spoiler columns on the tip and tenon of a certain model of hollow turbine blades.The ZL-27A penetrant was used to detect the turbine blades,and then acetone wipes were used to wipe off the fluorescent indications,identifying and marking the defective spoiler columns.Finally,the macroscopic and microscopic characteristics of the defects were observed and analyzed using a borescope and scanning electron microscope.The results showed that the uneven surface of the spoiler columns was the main cause of fluorescent indications.After wiping,linear fluorescent indications on the spoiler columns indicated cracks,while circular fluorescent indicated looseness.The defects were caused by casting process.For parts with fluorescent indications on the spoiler column location,acceptance should be rejected.