Study On Fining Grain Of Copper Rod By ECAP-Conform

This paper combined ECAP and CONFORM, developed a new fining grain technique, ECAP-Conform. ECAP-Conform can make ultra-fine grained rod, which causes extensive plastic deformation on material. The continuous nature of the process makes it promising to produce fine grained materials in efficient and cost effective manner.This paper refits the 300 Copper Conform Machine's mold system to apply ECAP-Conform experiment. This paper studies pure copper's deformation behavior of the ECAP-Conform. In this paper, the evolution law of the microstructure is observed through metallography experiment and is explained by combination of theoretic shearing model characteristics. Tensile and hardness tests are carried out to characterize the mechanical properties. These experiments show that pure copper gains better intensity and hardness performance after ECAP-Conform. The experiments result shows that the material achieves equable grain with the grain size of about 400nm after 12 passes of ECAP-Conform; the ultimate strength of the material increases from 48Mpa to 427Mpa and the HV hardness of material increases from 63 to 133.Therefore, In this paper, the 3-dimensional simulation of copper rod's ECAP-Conform deformation process has been done by FEM. Basing on rigid-plastic or rigid-viscoplastic FEM theory and heat transfer theory, the author uses DEFORM software as a CAE tool, building the finite element analysis model of copper rod's ECAP-Conform deformation. This paper explain the basic theory that will be used in analyzing the ECAP-Conform system's FEM method. And most important, this paper simulate the pure copper rod ECAP-Conform process. Analyze the key technical points during the simulation process. Summarize plasticdeformation rules, material flowing law. Receive velocity distribution, temperature distribution, effective stress and strain distribution and load-time curve and so on.