3차원 유한요소법을 이용한 등통로각압축(ECAP) 공정에서 단면형상의 영향연구
(A) Study on the Effect of Sectional Shape Change during Equal Channel Angular Pressing Process by the Three Dimensional Finite Element Method
유한요소법 등통로각압축 단면형상;
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There have been numerous efforts on the equal channel angular pressing(ECAP) which produces ultra-fine grains. This is a method that intense plastic strain can be produced in materials by simple shear. The merit of this method is that the shape of billet remains unaltered during the process. That makes a repetitive ECAP process possible. The purpose of this method is to produce the superior mechanical and physical properies on the billet. ECAP process produces a large amount of strain in a metal or alloy billet to fabricate sub-micron and nano-scale grained materials. In this dissertaion, the plastic deformation behavior of materials during ECAP precess is analysed using both a two-dimensional and a three-dimensional finite element (FE) analysis. The results have been compared with the experimental results. Pure-Zirconium and Zr-702 alloy are considered in order to apply them to structual materials of nuclear power station. Addtionally, the effect of sectional shapes is investigated during ECAP process. Either the similarities or differences of the microstructures obtained by both ECAP process and cold rolling are delineated. Particularly the crystallographic texture characteristics evloving from the two different modes of deformation were studied in relation to the specific routes of deformaion.