In this paper, a milling force prediction model considering the Taylor factor is established, and the Ti-6Al-4V milling force predicted by the model under different milling parameters is presented. In the study, the milling experiment of Ti-6Al-4V was carried out, the milling force was collected by the dynamometer, and the microstructure evolution of the milling surface before and after milling was observed by EBSD. Through the comparative analysis of the experimental results and the model prediction results, the reliability of the prediction model proposed in this study was verified, and the influences of the milling parameters on the milling force were further analyzed. Finally, based on the EBSD observation results, the effects of the milling parameters on the microstructure evolution of the milling surface were studied. The results show that both the tangential milling force and normal milling force increase with the increase in the milling depth and feed rate. Among the milling parameters selected in this study, the milling depth has the greatest influence on the milling force. The average errors of the tangential milling force and normal milling force predicted by the milling force model are less than 10%, indicating that the milling force prediction model established in this paper considering Taylor factor is suitable for the prediction of the Ti-6Al-4V milling force. With the change in the milling parameters, the grain structure, grain size, grain boundary distribution, phase distribution, and micro-texture of the material surface change to varying degrees, and the plastic deformation of the milling surface is largely coordinated by the slip.
In this paper, the VPSC (visco-plastic self-consistent) model was improved by considering the effect of heating rate. The hot compression deformation behavior and texture evolution of AA7075 were studied based on the improved VPSC model and EBSD (electron back-scattering diffraction). The stress–strain curves, inverse pole figure (IPF), and orientation distribution function (ODF) of the material were analyzed by combining TSL-OIM-Analysis, MTEX, and other analysis software. By observing the changes in grain structure and micro-texture of the material before and after hot compression deformation, the influence of macro-deformation conditions on the microstructure evolution of the material was studied, and the evolution law of grain structure and micro-texture was analyzed. It was found that the hot deformation parameters have significant effects on the stress–strain curve characteristics and micro-texture evolution of AA7075 during hot deformation. Copper {112} <111> and {011} <11¯1> are the main textures, and the strength and distribution of typical textures such as Copper {112} <111>, Cube {001} <100>, and Goss {011} <100> show regularity with the change in deformation conditions. Through comparing the predicted results of the improved VPSC model and experimental data, it is distinct that the improved VPSC model is suitable to predict the micro-texture evolution of AA7075 during hot compression. Finally, the sensitivity of micro-texture evolution to hot compression parameters such as heating rate was analyzed.
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