Temperature Change and Microstructure Evolution of the Bore Penetrated by Copper Jets

After metal jets penetrate the steel target, the jets' material adheres on the penetration channel wall. The research on the jets' material is helpful to analyzing the dynamic superplastic deformation and morphological changes of jets in the process of penetration and cooling. Theoretical computation and numerical simulation are used in this work to study the penetration process of copper jets, and the changes of temperature and grain size of copper jets adhered on the penetration channel wall are obtained. The simulated results are in good agreement with the SEM (Scanning Electron Microscope) observation. From the observation of microstructure of copper and steel, we can get the conclusion that the copper jets do not melt but instead undergo dynamic recrystallization in the process of penetration. In addition, the copper grain size increases obviously and the twins are formed in the cooling process.