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Session: 21-01: Poster Session
Paper Number: 98454
98454 - Residual Stress Evaluation for Peening Superalloy Using Non-Destructive Evaluation Techniques
Common metal is easily deformed or broken due to a decrease in strength at high temperatures, but superalloy steel containing various alloy elements has good corrosion resistance and oxidation resistance at high temperatures. These alloys are commonly used in extreme conditions such as gas turbines and aircraft engines. Since safety is important in industries using such superalloy steel, it is essential to evaluate the integrity of parts produced from superalloy steel. Besides, heat treatment and peening are frequently used in the metal as a method of improving the strength and residual stress of a material by changing the mechanical and physical properties of the metal. In particular, when peening is performed on the material, a high compressive surface residual stress is generated on the surface, which improves crack initiation resistance and prolongs the life of the part. In this way, the reliability of the material can be improved by periodically checking the residual stress state of the material. On the other hand, among the various non-destructive evaluation techniques, the methods mainly used to evaluate the properties of materials are the ultrasonic testing(UT) method and the eddy current testing(ECT) method. In this study, the residual stress of the peening superalloy specimen was evaluated using the most commonly used non-destructive testing methods, UT method and ECT method.
