Numerical simulation and experimental study on forging process of ultra-super-critical HP-IP rotor steel

Five experiments of forging processes for X12CrMoNbN10-1-1 steel were performed.Metallographs and average grain sizes for different processes were obtained after forging.Flow stress curves under high temperature were determined by compression test.By analyzing the results of numerical simulation and experiment data,it can be found that the processes of upsetting twice with stretching twice,upsetting three times with stretching three times and stretching three times with upsetting twice have better effect on refinement of grain size.