Monitoring of Thermal Damage after Deposition of Coatings via Barkhausen Noise Technique

This paper deals with monitoring of thermal damage of hardened steel 100Cr during deposition of coatings via magnetic Barkhausen noise. This study investigates influence of the different deposition regimes when the samples of the different hardness are coated. Hardness of the matrix before and after deposition is correlated with the Barkhausen noise features extracted from the raw Barkhausen noise signal. Results indicate that the Barkhausen noise technique is suitable for monitoring surface over-tempering initiated during coating deposition. Moreover, position of the Barkhausen noise envelope maximum correlates with hardness of the sample more than conventional effective value.