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Al-Zn-Mg-Cu-Zr 합금의 집합조직 발달과 기계적 특성에 미치는 Sc 첨가의 영향
제창웅,진승준,정동석,임성택,이용연,박노진 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.10
The texture and mechanical properties during fabrication processes - extrusion, cold rolling and aging treatment - of plate in the 7050 Al alloys without/with 0.1%Sc were investigated. In both the cross section(CS) and longitudinal section(LS) of the specimen without Sc, after cold rolling, texture of R-fiber was predominant. In the Sc added alloy after cold rolling, {112}<111>(Cu)+weak (123)<634>(S) texture components developed in the CS of the specimen while strong (3-fiber+(110)<001>(Goss) components developed in the LS of the specimen. After solution treatment and aging treatment, the alloy (CS and LS) without Sc had random texture, but by the alloys with the 0.1%Sc, the components of the rolling texture are not changed. After the aging treatment, hardness and tensile strength of the alloy with 0.1%Sc increased about 15% and 17%, respectively, than those without Sc. Tensile strength of the Sc added specimen was the highest along the rolling direction where the <111> texture was strongly developed. On the other hand, in the specimen without Sc, the mechanical properties were not dependent on the direction of the sample. (Received May 3, 2004)
0.1% Sc이 첨가된 7X1X Al-합금의 압연과 T-6열처리에 따른 집합조직의 발달
제창웅 ( Je Chang Ung ),진승준 ( Jin Seung Jun ),정동석 ( Jeong Dong Seog ),임성택 ( Im Seong Taeg ),박노진 ( Park No Jin ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.2
N/A After extrusion, cold rolling and T-6 treatment, texture development of 7×1× Al<alloy with 0.1% Sc is studied. During extrusion the very strong <111>+weak <100> fiber texture is developed, which is influenced on the formation of rolling texture. The texture after 80% cold rolling can be described by strong {112}<111>(Cu)+{l23}<634>(S) component in the cross section of the extruded rod, the strong -fiber+weak {110}<001>(Goss) Components in the longitudinal section, and the strong {110}412>(Bs)+weak {001}<100>(Cube) components in the transverse section. The components of rolling texture are remained after T-6 treatment, but the maximum density of ODF is higher. The calculated mean r-values and the planar anisotropy are relatively high, which are dependent on the texture. After T-6 treatment, recrystallized equiaxed grains with average grain size of 1-2 ㎛ are qbtained.
방향성 연속주조된 Al-Cu합금의 연화처리에 따른 미세조직과 기계적 성질의 변화
제창웅,윤재홍,정동석 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-
Directionally continuous casted Al-Cu alloys used the components of electronic and electric equipment need to specify the properties of them and optimum drawing condition in order to manufacture a fine wire. Therefore, the present investigation has been carried out for clarifying the changes of macrostructure, microstructure, mechanical properties, and the interrelations of them during annealing heat treatment in order to manufacture a fine wire in directionally continuous casted Al-Cu alloys. Recrystalized grains were not observed at below 200˚C in Al-1%Cu and Al-28%Cu alloys annealed, however recrystalized grains were observed with increasing annealing temperature. Recrystalization was occurred at inclusion/matrix interfaces and also appeared at the inclusions of smaller radius with increasing reduction ratio.
집합조직을 이용한 알루미늄판재의 성형성 향상에 관한 연구
이문규,제창웅,박노진 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
In order to improve the formability of Al-sheet, control of the crystallographic texture is essential because of the anisotropic nature of plastic properties. The formation of texture is governed by the thermomechanical processes such as cold rolling and annealing. In order to obtain different textures, cold rolling with/without lubrication and recrystallization were applied. The through-thickness texture gradient is formed during the cold rolling without lubrication. The center layer mainly consisted of the β-fiber texture but surface layer was composed of (001}<100) shear texture. Recrystallization with rolling texture of β-fiber led to typically an increase of the {001<100>-Cube component at the expense of the β-fiber orientation. However, from the rolling of {001}<100). shear component the recrystallization texture was observed which is composed by relatively strong {0.469 .814 0.342}<0.848 0.524 0.082>-, {112}<7 11 2>- and weak {001}<110>- {011}<011>-components. Much higher r-values were estimated with {0.469 0.814 0.342}<0.848 0.524 0.082>- {112}<7 11 2>-components than {001}<100>-Cube recrystallization texture.
원심주조한 Cu-Sn-Ni-Pb 계 합금의 기계적 성질에 미치는 P 첨가와 균질화 처리의 영향
권영환,제창웅,윤재홍,강창룡,김창규 ( Young Hwan Kwon,Chang Wooing Jea,Jae Hong Yoon,Chang Yong Kang,Chang Gyu Kim ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.5
N/A The purpose of this study is to investigate the effect of P addition and homogenizing heat treatment on the mechanical properties of Cu-Sn-Ni alloy. The addition of P was 0.025wt.%P to 0.085wt.%P and homogenizing heat-treated at 400, 500, 600℃ under N₂ gas atmosphere. Mechanical properties was investigated in this study were Rockwell hardness, tensile strength, and elongation. Tensile strength and elongation increased with P and homogenizing time. Temperature was significantly influence on mechanical properties. Hardness decreased with increasing homogenizing time and temperature, but 0.085wt.%P specimen was showed higher hardness and lower tensile strength and elongation than 0.073wt.%P specimen due to the presence of more Cu₃P in matrix.