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Al계 하이브리드 판재의 계면접합부 미세조직이 접합 특성에 미치는 영향
이성학(S. Lee),성효경(H.K. Sung),김정수(J. Kim),이동호(D.H. Lee),권용남(Y.N. Kwon),이광석(K.S. Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
This study was concerned with effects of interface microstructure between Al and Mg on mechanical properties of Al hybrid plate. Hybrid specimens were fabricated by using Al(All050) and Mg(AZ31) with four different heat treatments by controlling time (0, 10, 30, and 60 min) at 300℃. The yield and tensile strengths of tempered Al/Mg hybrid specimens were lower, but elongations were higher than non-heat treatment specimens, respectively. The tensile and 3 point bending properties were improved with decreasing the thickness of intermetallic layer. To develop high strength Al hybrid plates with an excellent combination of strength and elongation, reducing the formation of intermetallic layer was needed by controlling thermo-mechanical heat treatments.
최성무(S.M.Choi),김상호(S.H.Kim),조원석(W.S.Cho),이성학(S.H.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
Wear and friction properties of cast iron for cylinder block bore surface-treated with an accelerated electron beam were evaluated to develop a linerless bore system shich provides numerous benefits relative to the present cast iron sleeve system. These include: a reduction in ring/bore wear. Friction. And in engine oil consumption as well as a benefit in reduced corrosion. A reduction in engine weight. Overall costs. And a removal of machining process would be realized<br/>
롤 본딩법으로 제조한 Al-Cu 하이브리드 판재의 압하율이 기계적 물성에 미치는 영향
이수은(S.E. Lee),이광석(K.S. Lee),김정수(J.S. Kim),성효경(H.K. Sung),이성학(S.H. Lee),장영원(Y.W. Chang),김민중(M.J. Kim),배동현(D.H. Bae),권용남(Y.N. Kwon) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
We present here the influence of reduction ratio during roll bonding on the microstructural evolution, mechanical properties and room-temperature formability of Al-Cu 2-ply clad metal. The effect of reduction ratio upon the evolution of interface microstructure is first analyzed by means of scanning electron microscope (SEM) and transmission electron microscope (TEM) attached with energy dispersive spectroscopy (EDS). Taking the difference of microstructure upon reduction ratio into account, mechanical properties of this composite were evaluated by uniaxial tensile and peel tests. Formability was also verified by applying Erichsen tests.
STS-Al-Mg 3-ply 이종금속소재 계면 미세 조직 및 기계적 특성에 미치는 열기계적 처리의 영향
김정수(J. Kim),이광석(K.S. Lee),조유미(Y.M. Jo),이영선(Y.S. Lee),이성학(S. Lee),장영원(Y.W. Chang) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
Roll bonding between STS and Mg alloy by inserting aluminum alloy is one of the best ways to produce lightweight 3-ply laminated composite to circumvent the difficulty of direct bonding between STS and Mg alloys. However, Mg/Al interface has a drawback such as poor bonding strength, which has to be overcome to widen the application field of this material as a structural component. In order to enhance the bonding strength of Mg/Al interface, a great number of post roll-bonding treatments have been tried such as annealing or rolling processes. In this study, a series of secondary rolling process has been performed under various process conditions to evaluate the influence of thermo-mechanical treatment on interface microstructure and mechanical properties of STS-AI-Mg clad sheets.