Effect of magnetic treatment on magnetostrictive behaviour of HT70 steel

The measurement of dynamic magnetostriction shows that inelastic strains occur in uniaxial tensile specimens of various stress levels during magnetic treatment. The tests also show that in magnetic vibration there may be a resonant frequency that will be influenced by magnetic field intensity. The effect of stress state and magnitudes on the resonant frequency need to be studied further. Magnetic vibration may be the key factor that leads to the internal stress relaxation.