Affiliation:
1. Sungkyunkwan University
2. Korea Institute of Industrial Technology
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.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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