Nondestructive Testing of Friction-Fatigued Carburized Martensitic Steel

Abstract

We evaluated friction fatigue-induced changes in the microstructure and residual stress of carburized steel. By eddy current testing (ET) and x-ray diffractometry (XRD), the voltage rate (after/before fatigue testing) obtained by ET had a strong correlation with the retained austenite phase and the full width at half maximum of XRD. The results are useful for the analysis of fatigue damage in the microstructure of carburized steel.

Voltage rate (V_r) by eddy current testing (ET) have relation to retained austenite rate (R_γ) and the full width at half maximum rate (F_r) by x-ray diffractometry. On the other hand, it is difficult to detect a friction fatigue-induced change in residual stress rate (σ_r). Therefore, ET is indicated the possibility of a nondestructive method for fatigue damage.