Defect analysis of X22CrMoV12-l alloy thick-wall forgings
After rough machining of X22CrMoV12-l alloy thick-walled forgings,the ultrasonic flaw detection indicated that there were long strip defects.The defects had a great impact on the life of the forgings,and were easily exposed to the sur-face of forgings during the finishing process,thus affecting the normal use of the forgings.In order to understand the cause of the defects,the flaw detection defects of alloy thick-walled forgings were analyzed by metallographic inspection,scanning electron microscopy and energy spectrum analysis.The anatomical defect characteristics belonged to the typical slag inclu-sion defect.In the closed thick-walled ring forgings,the defects were in the shape of long strips.After forging deformation,the defects had the bifurcation and crack extension morphology.There were abnormal particles inside the defects,and the contents of O,Al,La and Ce were abnormal.Therefore,it could be inferred that the defect was the brittle oxide defect.
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