Effect of plastic deformation by torsion on damping properties of 2Kh 13 steel

Abstract

1. The basic mechanism in the dissipation of energy for plastically deformed 2Kh13 steel in torsion as in tension is microplastic deformations. 2. For a sample plastically deformed by torsion the total value of dissipation of energy, taken in relation to the level of dissipation of energy of a nondeformed sample, increases significantly with a small amount of plastic deformation and constantly increases with an increase in the degree of plastic deformation in relation to the amplitude of stress. 3. The total dissipation of energy for a sample plastically deformed by torsion is greater than for a sample plastically deformed by tension as a results of the closer coincidence of stressed condition obtained in plastic quasistatic and subsequent cyclic deformation and the greater the degree of plastic deformation and the lower the level of applied stresses, the greater this difference. 4. The magnetoelastic portion of the dissipation of energy, which predominates for a nondeformed material, drops sharply with initial plastic deformation by torsion and with an increase in the latter decreases insignificantly at all of the investigated stresses. Quantitatively the magnetoelastic portion of the dissipation of energy, taken in relation to the total amount of energy, for a sample plastically deformed by torsion is a larger portion than for a sample plastically deformed by tension.