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브레이징용 4343/3003+Zn/4343 클래드 핀재의 미세조직과 기계적 특성에 미치는 중간열처리 온도의 영향
어광준(K. Euh),김형욱(H.-W. Kim),김동배(D.B. Kim),오영미(Y.M. Oh) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
Aluminum clad sheets are widely used as brazing materials in the automotive heat exchangers due to their high specific thermal conductivity. In the present study, 1wt.%Zn-added AA3003 alloys are strip-cast and used as core alloys for aluminum clad sheets. The 4343/3003+Zn/4343 clad sheets are fabricated by the roll bonding process and further cold-rolled down to the thickness of 0.08mm. Intermediate annealing at the different temperatures is conducted during cold rolling. The effect of intermediate annealing temperature on the mechanical properties of aluminum clad sheets is elucidated by means of microstructural analysis.
박판주조 알루미늄 합금을 이용한 열교환기 브레이징용 클래드 판재 제조
어광준(K. Euh),김형욱(H. W. Kim),김수현(S. H. Kim),이윤수(Y. S. Lee),오영미(Y. M. Oh) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
Aluminum clad sheets are widely used as brazing materials for automotive heat exchangers due to their high specific strength and thermal conductivity. In this study, aluminum clad sheets are fabricated by the roll bonding process with strip-cast aluminum alloys. The clad sheets for heater tube are manufactured using twin-roll-cast(TRC) AA3527 and AA4343 alloys and further cold-rolled down to thickness of 0.2 mm with final annealing at 360, 380, and 400℃. Condenser fins are produced using TRC 3003Z and AA4343 alloys and intermediate annealing at the different temperatures is conducted during cold rolling. The effect of annealing temperature on the tensile, erosion, sag properties of aluminum clad sheets is investigated.
천이금속 원소가 미량 첨가된 Al-1.4Mn-1.0Zn 합금을 심재로 하여 제조된 콘덴서 핀용 알루미늄 클래드 박판의 특성
어광준(K. Euh),김형욱(H. -W. Kim),오영미(Y. M. Oh),김동배(D.B. Kim) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
Aluminum clad sheets are widely used as automotive condenser fins due to their high specific strength and thermal conductivity. In the present study, Al-Mn-Zn alloys are strip-cast and used as core alloys for aluminum clad sheets. Transition elements such as Cu and Cr are added to the core alloys in order to improve the properties of aluminum clad sheets. The AA4343/Al-Mn-Zn-X(X: Cu, Cr)/AA4343 clad sheets are fabricated by the roll bonding process and further cold-rolled down to the thickness of 0.08 mm with intermediate annealing. Sag resistance is greatly improved by addition of both Cu and Cr element. Tensile strength of as-rolled and brazing heat-treated clad is increased only by Cu addition.
콘덴서 핀용 알루미늄 클래드의 특성에 미치는 중간열처리의 영향
어광준(K. Euh),김동배(D.B Kim),오영미(Y.M. Oh),백은지(E. Baek),김수현(S.-H. Kim),김형욱(H.-W. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
Aluminum clad sheets are extensively used as brazing materials in the automotive heat exchangers due to their high specific thermal conductivity. In the present study, strip-cast 3000-series aluminum alloys having high strengths are used as core alloys for aluminum clad sheets. The high strength clad sheets are fabricated by the roll bonding process and further cold-rolled down to the thickness of 0.08㎜. An intermediate annealing at the different amount of reductions is conducted during cold rolling in order to obtain the thin aluminum clad sheets with different final reductions. The effect of intermediate annealing on the properties of high strength aluminum clad sheets is elucidated by means of microstructural analysis.
열교환기 브레이징용 알루미늄 클래드 판재의 침식 거동에 미치는 가공열처리의 영향
어광준(K. Euh),김형욱(H. W. Kim),이윤수(Y. S. Lee),오영미(Y. M. Oh),백은지(E. Baek) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
Strip-cast 3000-series aluminum alloys having high strengths are used as core alloys for aluminum clad sheets. The core alloys contains relatively high Mn concentration (1.5wt%), which can be readily produced by the strip casting. The AA4343/3000-series clad sheets are fabricated by the roll bonding process and further cold-rolled down to the thickness of 0.2mm. An annealing is conducted at the final thickness for preferred tube formability and improved erosion resistance during brazing process. The effect of thermomechanical treatment on the tensile and erosion properties of aluminum clad sheets is elucidated by means of microstructural analysis.
압출재 6061 알루미늄 합금의 피로특성에 미치는 열처리의 영향
김선호(S. H. Kim),김규식(K. S Kim),어광준(K. J. Euh),조규상(K. S. Cho),이기안(K. A. Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
The effect of heat treatment on the high-cycle fatigue behavior of 6061 extruded alloys was investigated in this study. Microstructure examination, tensile and high-cycle fatigue test were conducted on both AI-Si-Mg extruded (F) and heat treated (T6) conditions. From the tensile tests, yield and tensile strengths increased and elongation decreased by T6 heat treatment. The high-cycle fatigue results indicated that the fatigue strength of the 6061-T6 alloy was significantly higher than that of the 6061-F alloys. Fatigue cracks were initiated near the surface of specimens regardless of heat treatment. In the case of6061-T6 alloy, 2<SUP>nd</SUP> cracks easily appeared when the fatigue crack met Mg₂Si phase during fatigue propagation. Fine Mg₂Si phases could be formed and homogeneously distributed by T6 heat treatment. The Mg₂Si was believed to act an effective role of retardation of fatigue crack initiation and propagation. The fatigue deformation mechanism of extruded 6061 aluminum alloy was also discussed.