The
multiaxial ratcheting of 304
stainless steel at high temperatures (600℃) was experimentally analyzed, and then was described
in the frame of unified visco-plastic cyclic constitutive model. In the model, the rate dependence of material was reflected by a viscous term. The cyclic hardening and cyclic flow behaviors of 304
stainless steel under asymmetrical stress-controlled cycling were analyzed by the evolution rules of kinematic hardening back stress and isotropic deforming resistance. In the isothermal condition, the effect of temperature was introduced by temperature terms in evolution equations of isotropic deforming resistance. The special dynamic recovery characteristics of the back stress evolution appeared at a specific temperature range of 500~600℃ were reflected by fading factor. A new proportional factor was introduce into the model in order to consider the effect of loading path shape on the multiaxial
ratcheting. The effect of load history on the ratcheting was also considered by introducing a fading memorization function for the maximum inelastic strain amplitude and isotropic deformation resistance of the loading history. With the material constants determined by experiment, the multiaxial ratcheting of 304 stainless steel was numerically simulated at 600℃. It is shown that the predicted results agree well with the experimental ones.