X22CrMoV12-l合金厚壁锻件缺陷分析

Defect analysis of X22CrMoV12-1 alloy thick-wall forgings

X22CrMoV12-l合金厚壁锻件粗加工后经超声波探伤发现存在长条形缺陷显示,缺陷对锻件寿命影响极大,且容易在精加工过程中暴露在锻件表面,影响锻件的正常使用。为了了解该缺陷产生的原因,通过金相检验、扫描电镜检验和能谱分析等方法对合金厚壁锻件的探伤缺陷进行分析,解剖的缺陷特征属于典型的夹渣类缺陷。缺陷在密闭的厚壁环锻件中呈长条状,经过锻造变形,缺陷有分岔和裂纹延伸的形貌;缺陷内部有异常颗粒物,缺陷处O、Al、La、Ce元素含量异常,可以判断该缺陷为脆性氧化物缺陷。

After rough machining of X22CrMoV12-1l 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 surface 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 inclusion 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.