The detection ability of film hole microcracks by microfocus X-ray imaging method was analyzed for turbine blade machined with artificial simulated defects and turbine guide blade with microcracks. The actual size of artificial simulated defects in turbine blade was calibrated by optical microscope

and seven artificial simulated defects in turbine blade can be effectively detected by the microfocus X-ray imaging method. In addition

the size of artificial simulated defects was measured

and the size measurement results of artificial simulated defects are consistent with the calibration ones. In addition

the microfocus X-ray imaging experiment was designed for turbine guide blade

and the microcracks with length of 392 μm and width of 21 μm in the trailing edge of the turbine guide blade was detected by the microfocus amplification imaging method. The results show that the microfocus imaging method can meet the needs of engineering detection of microcracks in the film hole.