Magnetoacoustic emission, magnetization, and Barkhausen effect in decarburized steel

This paper reports the effects of grain size on magnetoacoustic emission and magnetic Barkhausen effects in sheets of decarburized steel and on the effects of grain size and carbon content on the bulk magnetic properties of decarburized and low carbon steels. Results show that, although the grain size does affect the magnetic properties, for example larger grain sizes lead to higher permeability, lower coercivity and larger Barkhausen and magnetoacoustic emission signals, it is the carbon content in the form of iron carbide precipitates which has the stronger effect on the magnetic properties.