On the possibility of magnetoacoustic evaluation of the resulting strengthening of medium-carbon steel as a result of two-stage plastic deformation.

Magnetic and magnetoacoustic properties of low-carbon steel subjected to two-stage cold plastic deformation by rolling and subsequent flat pressing are studied. It is determined that the hardness and coercive force are changing non-monotonically with deformation degree increase. Shape change during flat pressing leads to partial softening of the samples that lost flatness during rolling. It is established that the softening of the material can be detected by the amplitude of the parameter interrelated with the shape of the major hysteresis loop. It is shown that the parameter proportional to the field of the maximum of magnetoacoustic emission could be a diagnostic parameter of the resulting hardening of steel as a result of two-stage plastic deformation. [ABSTRACT FROM AUTHOR]