高温合金叶片常见缺陷的射线检测

Radiographic Inspection of Common Defects in Superalloy Blades

对铸造高温合金叶片射线检测底片常见缺陷进行分析,并对黑白线和衍射斑纹异常显示进行研究,射线底片上的黑白线显示原因为型芯不连续,即型芯断裂或型芯错位,型芯不连续随射线束透照角度变化在底片上可能会呈现白线、黑线或黑白线共存的显示;衍射斑纹是等轴晶叶片经常出现的一种影像,可通过改变透照电压或改变射线束透照角度进行识别。通过对射线底片黑白线显示和衍射斑纹影像的形成原因进行分析,并通过相应的确认方法进行影像判别,能够对射线底片影像准确定性,为射线检测员的准确判断提供指导意义。

The common defects of superalloy blades shown by radiographic negative films were analyzed,and the black and white lines and diffraction spots were also studied.The results show that the reason for the black and white lines on the radiographic films is the core discontinuity:core fracture or core dislocation.The core discontinuity may show white line,black line,or black-andwhite line on the negative films as the incident direction of the beam changes.Diffraction spots are a common image for equiaxed crystal blades,and they can be distinguished by changing the voltage or the incident angle.Through analyzing the formation cause of black and white lines and diffraction spots,and distinguishing the image through the corresponding confirmation method,radiographs can be accurately determined,which can provide guidance for the radiographic inspectors to make accurate judgment.