Magnetic behavior of AISI 304 steel in uniaxial tensile tests

The domain walls must overcome the stress produced by the pinning sites (grain boundary, dislocations, inclusions, etc.), producing discrete jumps in the magnetization. These jumps can be detected with a sensor coil located on the surface sample, transforming them in voltage pulses known as Magnetic Barkhausen Noise (MBN).

This work is the follow-up of the study on the uniaxial tensile test up to breakage, on AISI 304 steel (non-magnetic) samples. As a consequence of the strain a new ferromagnetic phase appears which produces MBN. From the signals obtained during the measurements, a digital filter was designed and applied in order to eliminate any spurious signal and to identify the MBN.