International Journal of Aerospace and Lightweight Structures

doi: 10.3850/S2010428615100199

Influence of Grinding on Eddy Current Signals of Fatigue Cracks in Austenitic Stainless Steels

Hao Feng¹, Ryoichi Urayama², Tetsuya Uchimoto², Toshiyuki Takagi^2,a, and Shejuan Xie^{3 1}Graduate 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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