비대칭 압연과 열처리한 Cu 판의 집합조직과 소성변형비 변화 (Ⅱ)

Abstract

The plastic strain ratio is one of the factors that affect the deep drawability of metal sheets. The plastic strain ratio of fully annealed Cu sheet is low, due to its texture being {001}<100>. In this study, in order to increase the plastic strain ratio of Cu sheets we investigated the effect of two treatments: 1st the sheet was asymmetrically rolled and annealed, and 2nd the sheet was symmetrically and asymmetrically rolled and subsequently annealed. The average plastic strain ratio (Rm) of the initial Cu sheet was 0.95 and Δr was 1.27. After the 2nd treatment of 5.3% symmetric rolling and annealing of Cu sheet at 1000°C for 60 min in Ar gas condition, the Rm was 2.29 times higher and the Δr was 1.44 times higher than that of initial Cu sheet specimen. After the 2nd treatment of 8.2% asymmetric rolling and annealing of Cu sheet at 1000°C for 60 min in Ar gas conditions, the Rm was 2.51 times higher and Δr was 0.53 times lower than that of the initial Cu sheet specimen. These results can be attributed to the change in texture of the Cu sheets due to the differences in the two methods of rolling.