加工图理论研究进展

Recent Development of Processing Map Theory

综述了基于原子模型的Raj加工图和基于动态材料模型(DMM)加工图的研究进展,重点介绍了DMM的原理,对比分析了几种常见的塑性失稳判断准则的优缺点,并以基于DMM加工图为例,分析了材料成形过程中各种变形机制,并进一步阐明了加工图的发展方向。

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 were made to help to achieve a better control of microstructure during processing. Different deformation mechanisms, including dynamic recrystallization, superplastic deformation, wedge cracking, formation of adiabatic shear bands and globulazation of lamella alpha were explained by the processing map based on DMM.