Comparative Study on Non-Destructive Testing Methods of Austempered Ductile Iron Thick-Walled Workpiece
The cavity-type defect detection method of austempered ductile iron thick-walled workpiece is discussed.Conventional ultrasonic testing,phased array ultrasonic testing,γ radiographic testing and high energy x-ray digital radiographic testing are carried out respectively.For the area with wall thickness ranging from 60 mm to 135 mm,the ultrasonic testing shows higher detection sensitivity,and can detect single defects with Φ0.9 mm reflection equivalent and regional defects.The detection effect of Co60,Ir192 and 9MeV digital radiographic testing is poor,and it is difficult to find the fine defects in the thick-walled workpiece.The 450 kV digital radiographic testing can only detect the obvious shrinkage in the thick-walled workpiece.
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