Analysis and Comparison of Techniques for Artificially Preparing Typical Aero-Engine Disk Material Defects

Material defects in titanium alloys, powder alloys, and wrought superalloys can compromise the structural integrity of aero-engine disks, thereby leading to uncontained failure, which poses a significant threat to aircraft safety. Studying how material defects affect rotor disks provides technical support for improving aircraft safety. Since natural defects rarely occur during normal production, researchers have developed methods to prepare defect-containing materials artificially. These methods primarily utilize hot isostatic pressing (HIP) to bond the defects into materials. Artificial defects are now well-established for titanium alloys and powder metallurgy alloys and are widely used in research. This paper describes the existing methods for creating artificial defects in titanium alloys and powder metallurgy alloys. Besides, this paper presents experiments creating "dirty white spot"defects in GH4169 superalloy. The experimental results show that although GH4169 with dirty white spot defects prepared by HIP can meet the requirements of ultrasonic testing research, the low mechanical strength of the HIP interface will affect the fatigue test results. Then, the differences and causes of the three types of materials containing artificial defects were compared and analyzed.