分别选用ZL-27A与ZL67渗透液对GH4169涡轮盘表面径轴向裂纹进行高灵敏度后乳化型与高灵敏度水洗型荧光渗透检测，超声波预清洗30 min后，渗透液浸渍与滴落60 min。利用体式镜和扫描电镜研究径轴向裂纹的宏观与微观特征。研究结果表明：GH4169高温合金涡轮盘在锻造过程中造成的表面径轴向裂纹，在高温下被表面氧化形成Cr2 O3为主的复杂氧化物层堵塞开口，使得渗透检测方法对其检出并不十分有效。
The post emulsifiable and water-washable fluorescent penetrant testing were carried out with ZL-27A and ZL67 respectively. Ultrasonic cleaning by detergent were used for 30 minutes before penetrant. The parts were immersed and drained for 60 minutes. The macroscopic and microscopic characteristics of cracks were researched using the split mirror and scanning electron microscope. The re-sults show that the outgrowth of high temperature oxidation plugs up the forging cracks. Thus the penetrant testing is not effective in de-tecting this type of cracks.
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