Evaluation of eddy current signatures for predicting different heat treatment effects in chromium–vanadium (CrV) spring steel

Abstract

The nondestructive test method (eddy current) was employed to study the effect of different heat treatment cycles (normalizing, annealing, quenching, and tempering) on chromium-vanadium (CrV) spring steel. The calibration of eddy current setup was carried out as per ASTM E566 and frequency optimization for the evaluation of heat treatment was carried out in absolute mode using shielded eddy current testing core probe. The eddy current signatures successfully distinguished the effect of different heat treatments cycles and variation in hardness for CrV samples. Scanning electron microscopy images confirmed the different microstructures as predicted by the eddy current testing.

Assessment of the Properties of AISI 410 Martensitic Stainless Steel by an Eddy Current Method

“…According to the thickness of hardened layers of AISI 1045 steel bar, Kahrobaee et al [10] have compared microstructural differences and hardness values of samples using multifrequency and multi-output eddy current sensors and obtained the relationship between the output voltage of sensors and hardness of samples. Hashmi et al [11] have evaluated the eddy current output characteristics of chromium‒vanadium spring steel under different heat treatments, and successfully distinguished the effects of different heat treatments on sample hardness changes.…”