High temperature hot deformation behavior of 022Cr22Ni5Mo3N duplex stainless steel
The high temperature hot deformation behavior of 022Cr22Ni5Mo3N duplex stainless steel was investigated by JMatPro11.0 thermal mechanicl simulator software and Gleeble-3500 thermal mechanical simulator to reveal its hot deformation characteristics at 1000-1150℃and strain rate of 0.01-5 s-1.The results show that the hot deformation temperature of 022Cr22Ni5Mo3N duplex stainless steel should be greater than the dissolution temperature of the brittle σ phase,which is 980℃.Secondly,the flow stress of the material de-creases with the increase of deformation temperature and the decrease of strain rate.The hot processing maps of the material were con-structed based on the dynamic material model and verified combined with microstructure.The optimal hot processing window is 1090-1125℃,0.01-0.03 s-1,which corresponds to the following organizational characteristics:the two-phase organization is homogeneous,the austenite phase undergoes sufficient dynamic recrystallization,and the σ phase does not exist in the microstructure.With the instabili-ty parameter of 1100℃and 5 s-1,the two-phase grains in the microstructure are stretched and the recrystallization ratio is low,and the precipitation at the phase boundaries is easy to induce crack.Therefore,the actual processing parameters should be close to the optimal hot processing process window to avoid the parameters of the instability zone and the strain precipitation of σ phase.
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