Study Of Micro Magnetic Detection Technology For Engine Turbine Disc

Turbine disk is one of the core components of aero engine, its quality directlydetermines the aircraft’s operation security. With the continuous improvement ofaircraft performance, the quality control of the turbine disk has also become more andmore prominent. While there are many methods to detect the turbine disk, theseconventional nondestructive testing technologies are not sensitive to certain defecttypes of turbine disk. Therefore, a nondestructive testing technology based ongeomagnetic field--micro magnetic detection was proposed, to detect the pores, cracks,especially the kiss defect exist in turbine disk.The superalloys GH4169turbine disk was studied in the research. Firstly, themagnetization characteristics of the material was tested, GH4169was proved to beparamagnetic materials. Secondly, the signal difference comparison method combinedwith low pass filter technology was raised to eliminate or restrain the detection signalnoise according to the characteristics that the detection signal amplitude is weak whilethe noise is strong. Thirdly, aiming at the recognition of defect signal, the signalrecognition algorithm combines peak to peak or magnetic field gradient withprobability statistics method was put forward. Meanwhile, the location andquantification of the defect were realized. Fourthly, a two-dimensional imagingsoftware for micro magnetic testing was compiled by using VB6.0program language.The visualization of detection results was realized. Finally, the micro magneticdetection technology for turbine disk was proved to be feasible through the testing ofthe standard specimens. A new method and thought for detection of the turbine diskwas provided.