Stability of the plastic and fatigue properties of steel 1Khl8N9t under longtime static loads in vacuum and in liquid lithium

Stainless steel 1Kh18N9T was held for a long time under static loads in vacuum or in liquid lithium at 650°C, and the effect of this treatment on its ductility and fatigue strength was studied. The results showed that the mechanical properties of this steel are affected by the treatment studied only if the stress applied during this treatment exceeds a certain critical level.     

Thermo-mechanical finite-element simulation of the tube sinking process

Thermo-mechanical finite-element model of the tube sinking process is presented in this paper. The model combines the rigid-plastic finite element approach, used to determine the velocity field, with the numerical solution of the convective-diffusion equation which accounts for the thermal events in the deformation zone. The condition of zero normal velocity and zero normal stress on the free inner surface of the tube was used to determine the shape of this surface. Typical results of calculations include the distributions of strain rates, strains, stresses and temperatures in the wall of the tube during the sinking process.