抄録
Fish eye failure that is unique fatigue fracture occurs in very long life region of high strength steel. However, mechanism of subsurface failure is unidentified. Measuring fish eye failure needs non-contact and the highly precise measurement. In this study, I examined using measurement by magnetostrictive effect and measuring magnetic property of high strength steel. As a result, high strength steel is magnetized in magnetic field. But fatigued high strength steel is not magnetized. This phenomenon is trapped magnetic wall movement by fatigue. Using measurement by magnetostrictive effect was difficult for high strength steel.
