Abstract
Magnetoacoustic emission (MAE), Barkhausen emission (BE), and hysteresis loop measurements have been made on steel specimens heat treated to produce ferritic/pearlitic structures with various volume fractions of ferrite Vα. It was found that in the low-field region the BE activity decreases whereas the MAE signal increases with Vα. Increasing Vα also results in a decrease in the initial peak height of MAE profiles and the formation of outer peaks in BE profiles. It was observed by Lorentz microscopy that in ferrite non-180° domain wall motion occurs readily in the low-field region, while in pearlite significant 180° domain wall motion takes place only when a reversed field was applied. These results can account for the variations in the MAE and BE profiles with Vα. The sensitivity of the MAE and BE profiles to Vα enables both techniques to be exploited for monitoring the ferrite content of steel components.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
