Recent development of processing map theory

Processing map is an effective tool for the optimization of materials workability, product property control and defect avoidance. Processing map is constructed by the superimposition of power dissipation efficiency and the instability maps, and can be divided into a safe domain and an unsafe domain. The developments of the Raj map and the processing map based on Dynamic Material Model (DMM) were reviewed in this paper. The DMM theory was introduced first, and then a comparison of different instability criteria was made to help to achieve a better control of micro structure during processing. Different deformation mechanisms, including dynamic recrystallization, superplastic deformation, wedge cracking, formation of adiabatic shear bands and globalization of lamella alpha were explained by the processing map based on DMM.