Non-Destructive Evaluation of Creep Damage of Ni-Based Superalloy Using A Scanning Blue Laser Microscope

Abstract:

In order to assure the reliability of advanced gas turbine systems, it is very important to evaluate the damage of high temperature materials such as Ni-based superalloys under creep and fatigue conditions quantitatively. The refractive index of the gamma-prime phase is found to be smaller than that of the gamma phase in the Ni-based superalloy, when the wavelength of an irradiated laser beam is shorter than 500 nm. Therefore, it is possible to evaluate the creep damage of this material quantitatively and non-destructively by observing the change of the micro texture in a grain (rafting) using a scanning laser microscope.

• Periodical: Key Engineering Materials (Volumes 353-358)
• Pages: 2391-2394
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.353-358.2391
• Online since: September 2007
• Authors: Kuniaki Akahoshi, Kazuhiro Ogawa, Hideo Miura
• Keywords: Creep Damage, Nickel-Based Superalloy, Non-Destructive Evaluation (NDE), Scanning Laser Microscope

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