Static recrystallization behavior of 12％Cr ultra-supercritical rotor steel at high temperature was studied by double-pass hot compression test using Gleeble-1500D thermomechanical simulator.Effects of strain rate and prestrain on the static recrystallization behavior of the tested material were discussed,and effects of deformation temperature and pass interval time were also elaborated.According to the test results,the kinetics model for static recrystallization and the static recrystallization grain size model of the material were established.The results show that the volume fraction of static recrystallization increases with the increase of temperature and prestrain.Moreover,the increase of strain rate and the extension of pass interval time are also conducive to the occurrence of static recrystallization.The static recrystallization activation energy of the material is calculated to be 3.155 × 105 J/mol.Combined with the static recrystallization grain growth model,the grain refinement process conditions are established.
12％Cr ultra-supercritical rotor steelstatic recrystallizationkinetics modelgrain size model
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