The effect of thermal exposition on the relaxation of residual stresses in a reinforced cylindrical sample in creep

This paper describes the effect of thermal exposition (high temperature soak) (T = 675 $^\circ$C) on the relaxation of residual creep stresses in the surface reinforced solid cylindrical sample of a ZhS6UVI alloy. The analysis is performed with the use of experimental data for the residual stresses after reinforcement by microspheres and after high-temperature soaks T = 675$^\circ$C for 50, 150, and 300 h. The paper describes the solution technique for the boundary-value problem of creep of the reinforced cylindrical sample with the initial stress-strain state in thermal exposition. The uniaxial experimental creep curves obtained at constant stresses of 500, 530, 570, and 600 MPa to construct models describing the first and second stages of creep. The calculated and experimental data for the longitudinal (axial) component of the residual stress tensor are compared, and it is found that they are in satisfactory agreement