The hot deformation behavior of 0Cr16Ni5Mo low carbon martensitic stainless steel was studied by the isothermal compression of cylindrical specimens at 900-1150℃ with the strain rate of 0.01-10s-1 on a Gleeble-3800 simulated machine. The relations of the thermomechanical parameters with strain were obtained using the hyperbolic-sine mathematics model and the hot deformation constitutive relationship was established. Processing map was also established based on the dynamic materials model. The microstructure evolution at different conditions was analyzed. The results show that the flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate, the deformation condition has a great influence on the material microstructure. The relationship between deformation parameters and strain have a good relativity, which can be expressed using four polynomial fitting. An optimum processing parameters of hot deformation for this steel can also be obtained by the maps, in which the hot temperature is 980-1150℃ and the strain rate is 0.01-0.2s-1.
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