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


Article Preview

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.



Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie




H. S. Park et al., "A Study on the Degradation of the Superalloy Inconel 718 Using Ultrasonic Technique", Key Engineering Materials, Vols. 353-358, pp. 523-526, 2007

Online since:

September 2007




[1] G. Appa Rao, M. Srinivas and D.S. Sarma: Mat. Sci. Eng. A Vol. 383 (2004), p.201.

[2] Y.S. Na, J.T. Yeom, N.K. Park and J.Y. Lee: Metal Mater. Int. Vol. 9 (2003), , p.15.

[3] S.H. Yoo, S.T. Kim, K.B. Yoon and S.H. Nahm: KSME, Vol. 18(1994), p.2860.

[4] J.W. Byeon, S.I. Kwun, U.S. Park, I.K. Park: J. Korean Soc. Heat Treatment, Vol. 14 (2001), p.110.

[5] C.S. Seok and J.P. Kim: KSME, Vol. 25 (2001), p.2116.

[6] ASTM E 8-04, Annual Book of ASTM standard, (2005).

[7] P.G. de Heij, D. d'Hulst, J. van Hoepen, E.V. van Osch, J.G. van der Laan : Fusion Eng. Design Vol. 58-59(2001), pp.775-779.

DOI: https://doi.org/10.1016/s0920-3796(01)00567-1