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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.29 No.10 pp.647-655
DOI : https://doi.org/10.3740/MRSK.2019.29.10.647

Effects of Hot Asymmetric Rolling on Microstructure and Formability of Aluminum Alloys

Museob Jeong1,Jongbeom Lee2,Jun Hyun Han1†
1Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
2Advanced Process and Materials Group, Korea Institute of Industrial Technology, Inchon 21999, Republic of Korea
Corresponding author
E-Mail : jhhan@cnu.ac.kr (J. H. Han, Chungnam Nat'l Univ.)

Abstract

In order to analyze the effect of hot asymmetric rolling on the microstructure and texture of aluminum alloy and to investigate the effect of the texture on the formability and plastic anisotropy of aluminum alloy, aluminum 6061 alloy is asymmetrically rolled at room temperature, 200 ℃, 350 ℃, and 500 ℃, and the results are compared with symmetrically rolled results. In the case of asymmetric rolling, the equivalent strain (εeq) is greatest in the upper roll part where the rotational speed of the roll is high and increases with increasing rolling temperature. The increase rate of the mean misorientation angle with increasing temperature is larger than that during symmetrical rolling, and dynamic recrystallization occurs the most when asymmetrical rolling is performed at 500 ℃. In the case of hot symmetric rolling, the {001}<110> rotated cube orientation mainly develops, but in the case of hot asymmetric rolling, the {111}<110> orientation develops along with the {001}<100> cube orientation. The hot asymmetric rolling improves the formability (r) of the aluminum 6061 alloy to 0.9 and reduces the plastic anisotropy (Δr) to near zero due to the {111}<110> shear orientation that develops by asymmetric rolling.

고온 비대칭압연이 알루미늄 합금의 미세조직과 성형성에 미치는 영향

정무섭1,이종범2,한준현1†
1충남대학교 신소재공학과, 2한국생산기술연구원 융합공정소재그룹

초록

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