Effect of strengthening and embrittlement on the dissipation of energy in the deformation-aging of casing steels for atomic plants

Abstract

1. In the original undeformed condition the primary mechanism for dissipation of energy in Cr−Ni−Mo−V and Mn−Ni−Mo pearlite casing steels is magnetomechanical hysteresis. 2. Plastic deformation almost completely suppresses magnetomechanical hysteresis and then the primary mechanism for the dissipation of energy is the mechanism of microplastic deformations. 3. For the investigated class of steels the composite characteristics of dissipation of energy were determined. These have a correlation relationship with the criteria for determining the tendency of steels toward deformation aging obtained on the basis of the results of mechanical tests. 4. A close correlation relationship was obtained only for the characteristics of damping determined without the application of a magnetic field. 5. With an increase in tempering time there is a decrease in the tendency of casing steels toward aging and an increase in their tendency toward deformation strengthening. 6. With an increase in the ductility of the investigated steels in the original condition there is an increase in the contribution of work hardening to embrittlement in deformation aging.