7000계열 Aluminum 합금의 냉간압연, 재결정에 따른 미세조직과 집합조직 변화 연구 A Study on the Evolution of Texture and Microstructure in Al-Zn-Mg-Cu (7xxx series) Alloy during Cold Rolling and Recrystallization원문보기
본 연구에서는 7000계열 알루미늄 합금을 냉간압연, 재결정에 따른 미세조직과 집합조직의 변화를 조사하였다. 압출 판재를 용체화 처리하여 압연 시 석출물의 영향을 줄이고자 하였으며, 압연방향과 압연율을 달리하여 냉간압연 하였다. 압출방향에서 평행한 방향(Parallel Section)으로 50%, 71% 그리고 수직 방향(...
본 연구에서는 7000계열 알루미늄 합금을 냉간압연, 재결정에 따른 미세조직과 집합조직의 변화를 조사하였다. 압출 판재를 용체화 처리하여 압연 시 석출물의 영향을 줄이고자 하였으며, 압연방향과 압연율을 달리하여 냉간압연 하였다. 압출방향에서 평행한 방향(Parallel Section)으로 50%, 71% 그리고 수직 방향(Transverse Section)으로 50%, 71% 로 냉간 압연하여 시편을 제작하였다. 재결정 열처리는 400℃에서 진행하였다. 광학현미경(OM)을 통하여 ND면과 TD면의 미세조직을 관찰하였고, Shear Band와 Micro Band를 확인하였다. XRD Pole Figure를 이용해 냉간압연 판재의 층별 집합조직을 측정하고, Orientation Distribution Function (ODF)와 Skeleton Line로 분석하여 Bs, S, Cu, Cube Orientation을 확인하고 β-fiber 변화를 관찰했다. 각 시편들의 가공성은 집합조직을 이용하여 R-value로 계산하였다. 용체화 처리시 가공성이 나쁜 Cube Orientation이 발달하였다. 윤활제를 사용한 대칭 냉간압연 진행시 압연율에 따라 가공성이 나쁜 Cube Orientation과 β-fiber의 집합조직 강도가 낮아졌다. 또한 재결정 열처리 후 랜덤집합조직을 형성하였다. 측정된 집합조직을 이용하여 계산한 R-value는 압연율이 높아질수록 최대값이 증가했지만 방향에 따른 이방성도 증가하는 것을 확인하였다. 하지만 두께에 따른 차이는 줄어드는 것을 확인하였다. 방향에 따른 이방성은 재결정 열처리를 진행했을 때 확연히 감소되었다. 또한 압출 방향에 평행한 방향으로 압연한 시편에 비해 수직방향으로 압연한 시편에서의 방향에 따른 이방성이 낮은 것을 확인하였다.
본 연구에서는 7000계열 알루미늄 합금을 냉간압연, 재결정에 따른 미세조직과 집합조직의 변화를 조사하였다. 압출 판재를 용체화 처리하여 압연 시 석출물의 영향을 줄이고자 하였으며, 압연방향과 압연율을 달리하여 냉간압연 하였다. 압출방향에서 평행한 방향(Parallel Section)으로 50%, 71% 그리고 수직 방향(Transverse Section)으로 50%, 71% 로 냉간 압연하여 시편을 제작하였다. 재결정 열처리는 400℃에서 진행하였다. 광학현미경(OM)을 통하여 ND면과 TD면의 미세조직을 관찰하였고, Shear Band와 Micro Band를 확인하였다. XRD Pole Figure를 이용해 냉간압연 판재의 층별 집합조직을 측정하고, Orientation Distribution Function (ODF)와 Skeleton Line로 분석하여 Bs, S, Cu, Cube Orientation을 확인하고 β-fiber 변화를 관찰했다. 각 시편들의 가공성은 집합조직을 이용하여 R-value로 계산하였다. 용체화 처리시 가공성이 나쁜 Cube Orientation이 발달하였다. 윤활제를 사용한 대칭 냉간압연 진행시 압연율에 따라 가공성이 나쁜 Cube Orientation과 β-fiber의 집합조직 강도가 낮아졌다. 또한 재결정 열처리 후 랜덤집합조직을 형성하였다. 측정된 집합조직을 이용하여 계산한 R-value는 압연율이 높아질수록 최대값이 증가했지만 방향에 따른 이방성도 증가하는 것을 확인하였다. 하지만 두께에 따른 차이는 줄어드는 것을 확인하였다. 방향에 따른 이방성은 재결정 열처리를 진행했을 때 확연히 감소되었다. 또한 압출 방향에 평행한 방향으로 압연한 시편에 비해 수직방향으로 압연한 시편에서의 방향에 따른 이방성이 낮은 것을 확인하였다.
In this study, microstructure and texture of 7000 series aluminum alloy were investigated with cold rolling and recrystallization. Solution treatment is intended to reduce the effect of sediment on the rolling of the extruded plate. Cold rolling was performed at different directions and reduction ra...
In this study, microstructure and texture of 7000 series aluminum alloy were investigated with cold rolling and recrystallization. Solution treatment is intended to reduce the effect of sediment on the rolling of the extruded plate. Cold rolling was performed at different directions and reduction rates. The specimens were prepared by cold rolling at 50% and 71% respectively in the parallel direction and the transverse direction based on the extrusion direction. The recrystallization heat treatment was carried out at 400°C. The microstructure of the ND surface and TD surface was observed through an optical microscope. After that, Shear band and Micro band were confirmed. The XRD Pole figure was used to measure the texture of the cold rolled sheet by layer and analyzed by Orientation Distribution Function (ODF) and Skeleton Line. Bs, S, Cu and Cube Orientation were observed and β-fiber changes were confirmed. The workability of each specimen was calculated by R-value using the texture. Cube Orientation with poor processability was developed during solution treatment. In the case of symmetric cold rolling using a lubricant, the texture strength of the Cube Orientation and β-fiber, which have poor processability, was lowered according to the rolling rate. After the recrystallization heat treatment, a random texture is formed. The R-values calculated using the measured texture showed that the maximum value increased as the rolling rate increased, but the anisotropy along the direction also increased. However, it is confirmed that the difference according to the thickness decreases. The directional anisotropy was significantly decreased by recrystallization heat treatment. The anisotropy of the specimen rolled in the transverse direction was lower than that of the specimen rolled in the direction parallel to the extrusion direction.
In this study, microstructure and texture of 7000 series aluminum alloy were investigated with cold rolling and recrystallization. Solution treatment is intended to reduce the effect of sediment on the rolling of the extruded plate. Cold rolling was performed at different directions and reduction rates. The specimens were prepared by cold rolling at 50% and 71% respectively in the parallel direction and the transverse direction based on the extrusion direction. The recrystallization heat treatment was carried out at 400°C. The microstructure of the ND surface and TD surface was observed through an optical microscope. After that, Shear band and Micro band were confirmed. The XRD Pole figure was used to measure the texture of the cold rolled sheet by layer and analyzed by Orientation Distribution Function (ODF) and Skeleton Line. Bs, S, Cu and Cube Orientation were observed and β-fiber changes were confirmed. The workability of each specimen was calculated by R-value using the texture. Cube Orientation with poor processability was developed during solution treatment. In the case of symmetric cold rolling using a lubricant, the texture strength of the Cube Orientation and β-fiber, which have poor processability, was lowered according to the rolling rate. After the recrystallization heat treatment, a random texture is formed. The R-values calculated using the measured texture showed that the maximum value increased as the rolling rate increased, but the anisotropy along the direction also increased. However, it is confirmed that the difference according to the thickness decreases. The directional anisotropy was significantly decreased by recrystallization heat treatment. The anisotropy of the specimen rolled in the transverse direction was lower than that of the specimen rolled in the direction parallel to the extrusion direction.
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