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A Study on the Degradation of the Superalloy Inconel 718 Using Ultrasonic Technique

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Abstract:

The Ni-based superalloy Inconel 718 (IN-718) was developed in the 1950s and is currently used for several critical gas turbine components due to its good balance of mechanical properties. Because of its stable mechanical properties at high temperature, the alloy is used for turbine bolts. The mechanical properties of in-service facilities are required to maintain safety operation in power plants. Ultrasonic tests, tensile tests and hardness tests were performed to evaluate the degree of the material degradation of Inconel 718. The mechanical properties decreased as degraded, but the longitudinal velocity of the ultrasonic signal increased. Also, the microstructure of the degraded Inconel 718 was to study the relationship between the result from ultrasonic test and the results from destructive methods.

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Periodical:

Key Engineering Materials (Volumes 353-358)

Pages:

523-526

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.353-358.523

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Online since:

September 2007

Authors:

Hong Sun Park, Hyung Ick Kim, Yong Huh, Moon Young Kim, Sang Yeol Park, Jae Mean Koo, Chang Sung Seok

Keywords:

Gas Turbine Bolt, Inconel 718, Mechanical Property, Microstructure, Ultrasonic

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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DOI: 10.1016/s0920-3796(01)00567-1

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