Discussion about problem of ultrasonic bottom echo loss monitoring of powder metallurgy superalloy disc
SUN Zhi-kun1， LU. Ri-hong3， YU Dong1，
1. High Temperature Materials Research Institute，CISRI，Beijing 100081，China
2.Beijing Key Laboratory of AdvancedHigh Temperature Materials，Beijing 100081，China
3.Guizhou Li Yang Aero Engine Co.，Ltd.，Guizhou 550014，China
Abstract：In order to study the effect of monitoring the primary bottom echo or multiple bottom echo on the detection results of bottom loss of powder superalloy disc during ultrasonic testing was studied，a comparative test block of powder super alloy reference block with flat bottom holes was selected to conduct experimental research，and the C-scan detection results obtained by monitoring the primary or multiple bottom waves were compared. The results showed that the abnormal attenuation region of the bottom wave could be detected effectively by monitoring the primary or multiple bottom echo.The maximum value of the bottom loss was the same by monitoring the bottom loss through the primary bottom echo or multiple bottom echo，but the area of defect are a was enlarged by secondary or multiple bottom waves monitoring. Therefore，it was not easy to miss detection by using the method of monitoring the bottom loss by the secondary or multiple bottom echo. When the thickness of powder superalloy dis was relatively thin，the bottom loss could be monitored by the secondary bottom wave.
孙志坤，吕日红，于冬. 粉末高温合金盘件超声波底损监控问题探讨[J]. 物理测试, 2019, 37(6): 27-31.
SUN Zhi-kun，LU. Ri-hong，YU Dong . Discussion about problem of ultrasonic bottom echo loss monitoring of powder metallurgy superalloy disc. PHYSICS EXAMINATION AND TESTING, 2019, 37(6): 27-31.
2019, Vol. 37 
