Changes in eddy current testing signals of fatigue cracks by heat processing

Issue title: Proceedings from the 17th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2015)

Guest editors: Fumio Kojima, Futoshi Kobayashi and Hiroyuki Nakamoto

Article type: Research Article

Authors: Uchimoto, Tetsuya^{a; *} | Takagi, Toshiyuki^a | Wu, Xiaoyang^b | Feng, Hao^b | Urayama, Ryoichi^a

Affiliations: [a] Institute of Fluid Science, Tohoku University, Sendai, Japan | [b] Graduate School of Engineering, Tohoku University, Sendai, Japan

Correspondence: [*] Corresponding author: Tetsuya Uchimoto, Institute of Fluid Science, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan. Tel./Fax: +81 22 217 5262; E-mail:[email protected]

Abstract: In applying eddy current testing to evaluation of fatigue cracks in austenite stainless steels, various influential factors are needed to be considered, such as martensite transformation of austenitic phase, crack closure, and oxide formation between crack faces, and so on. In this study, influential factors of heating of fatigue cracks in type 316 austenitic stainless steels are evaluated through experimental and numerical analysis. Signal phase shift and amplitude decrease by heating is systematically discussed.

Keywords: Eddy current testing, fatigue crack, austenitic stainless steel, heat treatment, martensitic phase

DOI: 10.3233/JAE-162044

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 677-684, 2016