摘要
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.
作者
马海全
甘勇
张卫
白召净
李秋生
方占华
MA Hai-quan;GAN Yong;ZHANG Wei;BAI Zhao-jing;LI Qiu-sheng;FANG Zhan-hua(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing 100095,China;Key Laboratory of Aeronautical Materials Testing and Evaluation,Aero engine corporation of China,Beijing 100095,China;Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation,Beijing 100095,China)
出处
《失效分析与预防》
2020年第3期159-163,178,共6页
Failure Analysis and Prevention
关键词
射线检测
黑白线
衍射斑纹
型芯不连续
radiographic inspection
black and white lines
diffraction spots
core discontinuity