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- 저자 : 정무섭 ( Museob Jeong ) (검색결과 3 건)
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고온 비대칭압연이 알루미늄 합금의 미세조직과 성형성에 미치는 영향
정무섭,이종범,한준현,Jeong, Museob,Lee, Jongbeom,Han, Jun Hyun 한국재료학회 2019 한국재료학회지 Vol.29 No.10
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, $200^{\circ}C$, $350^{\circ}C$, and $500^{\circ}C$, and the results are compared with symmetrically rolled results. In the case of asymmetric rolling, the equivalent strain (${\varepsilon}_{eq}$) 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 $500^{\circ}C$. 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 (${\bar{r}}$) of the aluminum 6061 alloy to 0.9 and reduces the plastic anisotropy (${\Delta}r$) to near zero due to the {111}<110> shear orientation that develops by asymmetric rolling.
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열처리 온도 및 냉각방법이 Cu-22Sn합금의 미세조직 및 경도변화에 미치는 영향
정무섭 ( Museob Jeong ),신아리 ( Ari Shin ),한준현 ( Jun Hyun Han ) 한국열처리공학회 2018 熱處理工學會誌 Vol.31 No.3
The effects of heat treatment time and cooling method on microstructure and mechanical property of Cu-22wt%Sn alloy were discussed. α+δ mixed phase structure was obtained in air-cooled specimens after heat treatment at 775, 750, and 700℃ for 1 hour. On the other hand, in water-cooled specimens, α+β' martensite mixed phase was obtained. In the case of water-cooled specimens, the hardness value decreased with decreasing heat treatment temperature because the volume fraction of α phase with low hardness value increased as the heat treatment temperature decreased. In water-cooled specimen after heat treatment at 600oC, γ' martensite was formed instead of β' martensite. The hardness value of γ' martensite was lower than those of β' and δ phases. (Received April 12, 2018; Revised April 18, 2018; Accepted April 27, 2018)
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Cu-Sn합금의 미세조직과 기계적 특성에 미치는 템퍼링 온도 및 시간의 영향
정무섭 ( Museob Jeong ),이호형 ( Hohyung Lee ),한준현 ( Jun Hyun Han ) 한국열처리공학회 2020 熱處理工學會誌 Vol.33 No.2
To study the effects of tempering on microstructure and mechanical property of Cu-22 wt.%Sn alloy, tempering was carried out for 30 sec, 1 min, 5 min, 30 min, 3 h, 5 h, and 10 h at 325, 370, 500, and 570℃, which are in the (α+ε), lower (α+δ), higher (α+δ), and (α+γ) region of Cu-Sn phase diagram, respectively. Overall, the hardness value increased and decreased over time at all tempering temperatures, and the time to reach the maximum hardness value beccame shorter as the tempering temperature increases. At the beginning of tempering at each temperature, a portion of the β' phase was decomposed into a fine (α+δ) phase or (α+γ) phase, so that the Cu-22Sn alloy had a high hardness value. However, as the tempering time increases, the hardness value of the alloy decreased due to the growth of the decomposed phases. (Received March 16, 2020; Revised March 20, 2020; Accepted March 24, 2020)
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