• 제목/요약/키워드: Recrystallization Texture

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알루미늄 1050계 판재에서 결정립 성장 집합조직에 미치는 재결정 집합조직의 영향 (Effect of Primary Recrystallization Texture on the Formation of Grain Growth Texture in Aluminum 1050 Sheet)

  • 김현철;강형구;허무영
    • 대한금속재료학회지
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    • 제47권6호
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    • pp.356-362
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    • 2009
  • In order to vary the primary recrystallization textures, AA 1050 sheets were cold rolled in two different manners. Differences in cold rolling schedule gave rise to the formation of different cold rolling textures also leading to the formation of different primary recrystallization textures. Upon annealing for grain growth, changes in microstructure and texture hardly occurred in the sample depicting Cube recrystallization texture, while grain growth was accompanied with the development {001}<100> Cube texture in the sample displaying a recrystallization texture comprising of weak rolling texture components. The selective growth of Cube oriented grains is attributed to the high mobility of their grain boundaries.

알루미늄 판재의 온간압연 집합조직과 미세조직에 미치는 초기 집합조직의 영향 (Effect of Initial Texture on the Evolution of Warm Rolling Texture and Microstructure in Aluminum Alloy Sheet)

  • 김훈동;허무영
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2001년도 추계학술대회 논문집
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    • pp.138-141
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    • 2001
  • The evolution of lectures and microstructure during the warm-rolling and subsequent annealing in aluminum 3004 alloy sheets was investigated by employing X-ray texture measurements and microstructure observations. Whereas the typical $\beta$-fiber orientations with the strong Bs-orientation $\{112\}<110>$ formed in the normally cold-rolled specimen, the warm-rolling at $250^{\circ}C$ led to the development of a strong through thickness texture gradient which was characterized by shear texture at the surface layer and rolling textures at the center layer After warm rolling, ultra-fine grains formed in the thickness layer with shear texture components. Upon recrystallization annealing, the $\{001\}<100>$ Cube-texture developed at the expense of normal rolling texture components the rise to the formation of corase recrystallized grains. However, in the layer with shear texture components the continuous recrystallization took place and the fine grain size persisted even after recrystallization annealing.

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도금층의 재결정 집합조직에 관한 연구 (A Study on the Recrystallization Texture of Electrodeposits)

  • 홍상철
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1999년도 춘계학술대회논문집
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    • pp.184-187
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    • 1999
  • The texture of electrodeposits is related to microstructure surface morphology and mechanical properties. When the electrodeposits annealed the recrystallization texture many be different from the original deposition texture. the <100> and <110> textures of nickel electrodeposits changed to the <100> and <{{{{ SQRT {310 } }}}}> textures when recrystallized The <100> and <{{{{ SQRT {310 } }}}}> mixed texture is changed to the <100> texture. The <002> texture of Zn electrodeposits didn't changed even after recrystallization.

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AA3004에서 전단변형 미세조직 및 집합조직의 형성 (Formation of Shear Texture and Microstructure in AA3004 Sheet)

  • 이강노;김종국;김훈동;황병복;허무영
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2002년도 춘계학술대회 논문집
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    • pp.184-186
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    • 2002
  • The evolution of texture and microstructure during warm rolling and subsequent annealing in aluminium 3004 alloy sheet was investigated by X-ray texture measurements and microstructure observations. Warm rolling at 250$^{\circ}C$ led to the development of strong through thickness texture gradients with shear textures at the surface layer and a regular rolling texture in the center of the sheets. FEM simulations indicated that these texture gradients are caused by pronounced strain gradients throughout the sheet thickness. Upon recrystallization annealing, in the sheet center the characteristic cube-recrystallization texture developed, while in the surface layers with a pronounced shear texture continuous recrystallization took place which led to the formation of a very fine grained microstructure. It is concluded that the very complex strain history in the near-surface layers together with the resulting high work-hardening rate gave rise to the formation of the ultra-fine grains with an average size smaller than 2$\mu\textrm{m}$.

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STS 430 강판의 리징 현상에 미치는 초기집합조직의 영향 (The Effect of Initial Textures on Ridging in STS 430 Steel)

  • 이재협;이창호;박수호;허무영
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2004년도 춘계학술대회 논문집
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    • pp.225-227
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    • 2004
  • Recrystallization textures of ferritic stainless steel sheets of STS 430 were varied by means of different cold rolling procedures. The conventional normal rolling led to the evolution of strong through-thickness texture gradients in the final recrystallization texture, while the cross-rolling led to a decrease in texture gradients. Micro-texture observation by EBSD revealed that the formation of band-like orientation colonies formed close to the center layer was responsible for ridging. Modification of the recrystallization texture and microstructure by cross-rolling destroyed band-like orientation colonies and consequently reduced the ridging height.

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AA 5052 판재의 집합조직 발달과 결정립 크기에 미치는 다양한 냉간압연 공정의 영향 (Effect of various cold rolling process on the evolution of texture and recrystallized grain size in AA 5052 sheet)

  • 이준혁;나정준;허무영
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2008년도 춘계학술대회 논문집
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    • pp.408-410
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    • 2008
  • The evolution of texture and microstructure during recrystallization was tracked after different cold rolling of aluminum sheets. Texture of the sheet center were differentiated by different strain states due to prior deformation. The evolution of recrystallization texture was studied with the amount of shear applied during cold rolling. The final grain size after recrystallization annealing was varied due to the effective strain during deformation.

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STS 430 강에서 교차압연 집합조직의 형성 (Formation of Cross Rolling Textures in STS 430 Steel Sheet)

  • 이재협;이창호;박수호;허무영
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2003년도 추계학술대회논문집
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    • pp.136-137
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    • 2003
  • Recrystallization textures of ferritic stainless steel sheets of STS 430, the crystallographic texture was modified by means of cross rolling and subsequent annealing. The conventional normal rolling led to the formation of {334}<483> in the final recrystallization texture. Cross rolling in the present work was performed by a 45$^{\circ}$rotation of RD around ND. After recrystallization annealing the cross-rolled samples displayed stronger{111}//ND orientations. The cross rolled sample displayed a higher resistance against ridging.

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Effects of Amount of Second Cold-Reduction on Secondary Recrystallization and Texture Development in Grain-Oriented Silicon Steel

  • Yoon, Young-Ku;Lee, Taek-Dong
    • Nuclear Engineering and Technology
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    • 제3권3호
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    • pp.129-140
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    • 1971
  • 3.25% 규소를 함유하는 규소강을 융해·합금하고 압연·열처리하여 연질 자심재료로서 응용범위가 넓은 방향성 규소강판을 제조·실험했다. 이 연구에서는 잉고트 중의 망간 및 유황함량, 탄화물 석출과 유관한 열간압연 직후의 열처리조건, 2차 냉간 압연율 등이 2차 재결정 및 집합조직에 미치는 영향을 다루었다. 그 중에서도 특히 2차 냉간 압연율이 2차 재결정과 관련한 각종 활성화 에너지와 집합조직에 미치는 영향을 중점적으로 구명하였다. 2차 냉간 압연율이 10%인 시편은 응력 병형의 도입으로 인한 결정입계 이동으로 결정립성장 만이 관찰되었으며 핵생성을 동반한 2차 재결정은 일어나지 않았다. 2차 냉간 압연율이 30%인 시편에서는 2차 재결정을 위한 핵생성만 있었으며 2차 재결정이 완전히는 일어나지 않았다. 이 실험 조건하에서 50%의 2차 냉간압연율이 2차 재결정을 일으키기에 최적 냉간 압연율이며 가장 높은 직접도를 얻을 수 있는 압연율이었다.

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TEXTURE AND RELATED PHENOMENA OF ELECTRODEPOSITS

  • Lee, D.N.
    • 한국표면공학회지
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    • 제32권3호
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    • pp.317-330
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    • 1999
  • The texture of electrodeposits changes from the orientation that places the lowest energy crystal facets parallel to the substrate under a condition of low ion concentration adjacent to the deposit, to the orientation that places the higher energy crystal facets parallel to the substrate as the ion concentration adjacent to the deposit increases. The electrodeposits have peculiar surface morphologies and microstructures depending on their textures, which in turn may affect their mechanical properties even when they are obtained in a similar electrolysis condition. The electrodeposits undergo recrystallization, when annealed. The recrystallization texture may be different from the deposition texture. These phenomena have been discussed.

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