International Journal of Aerospace and Lightweight Structures 2014 4 3 banner.jpg 10.3850/S2010428615100199 Influence of Grinding on Eddy Current Signals of Fatigue Cracks in Austenitic Stainless Steels Hao Feng1, Ryoichi Urayama2, Tetsuya Uchimoto2, Toshiyuki Takagi2,a, and Shejuan Xie3 1Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai 980-8579, Japan. 2Institute of Fluid Science, Tohoku University, Aoba-ku, Sendai 980-8577, Japan. dtakagi@ifs.tohoku.ac.jp. 3State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China. ABSTRACT

We investigate the influence of machining process on eddy current testing (ECT) signals of fatigue cracks in low-carbon austenitic stainless steels. Several fatigue cracks were created using the four-point bending method. Grinding seals fatigue cracks on the crack mouth after their fabrication and engender some conductivity. The fatigue crack behavior was confirmed by comparison with electric discharge machining and numerical simulation of ECT signals. The effect of α-martensite transformation of austenite during crack propagation on ECT signals is also considered.

Keywords: Fatigue crack, Grinding, Eddy current testing, Austenitic stainless steel, Martensitic transformation.

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