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용탄단조법에 의한 금속 복합재료의 제조공정에 있어서 예비성형체의 변형과 그 방지책에 관한 실험적 연구
강충길,구광서,박봉수 ( Chung Gil Kang,Kwang Seo Ku,Bong Soo Park ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.4
N/A Through a series of experiments with preforms which had random oriented fiber distribution, preform deformation and the tensile strength of metal matrix composites were investigated. Experimental data are presented for injection of aluminum-alloy melts into preforms which are composed of δ-alumina short fiber of SAFFIL with a silica binder. The composites materials used in this study were Al2024 and AC4C. Processing parameters considered in this study were preform temperature, applied pressure, delay time and fiber length. The effects of processing parameters on microstructures of metal matrix composites, SEM micrographs and optical micrographs were also examined.
반용융 다이캐스팅 공정에 있어서 속도제어방법이 제품의 특성에 미치는 영향
서판기,강충길,손영익,Seo, Pan-Ki,Kang, Chung-Gil,Son, Young-Ik 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.10
The process design to produce a near net shape home-appliance compressor component using semi-solid die casting process is performed. In order to obtain a good component without defects such as liquid segregation and porosity, the relationship between pressure and time, and plunger tip displacement and injection velocity are proposed with repeated trial and error. The effect of the velocity variation in the process parameters on liquid segregation and extraction is investigated to produce the aluminum frame part(a kind of compressor part) with good mechanical properties. The mechanical characteristic of semi-solid die casting formed parts for AlSi7Mg0.65r(A357) and AlSi17Cu4Mg(A390) are investigated with a view to minimizing the occurrence of defects. To investigate of application possibility at industry field, A380 aluminum alloy with 8∼9% silicon contents used for the squeeze casting process. The obtained mechanical properties is compared with semi-solid die casting.
간접 용탕단조법에 의하여 제조한 SiCp/6061 Al 복합재료의 조직과 기계적 성질
서영호,강충길 ( Young Ho Seo,Chung Gil Kang ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.4
N/A Particulate reinforced aluminum alloys produced by indirect squeeze casting are difficult to shape by cutting or milling. Therefore near net shape forming of complex shapes is of high economic and technical interest. The complex shape products of SiC_p/6061 Al composites are fabricated by the melt-stirring and indirect squeeze casting process. The mold temperatures are 200˚C and 300˚C and applied pressures are 70, 100, and 130 MPa. The volume fractions of the reinforcements are in the range of 5 vol% to 15 vol%. The reinforcement dispersion state are observed using on optical microscope. By employing observed results systematically a correlation is demonstrated among the microstructure, particles behavior, mechanical properties and processing parameters for an optimum melt-stirring(compocasting) and indirect squeeze casting process of MMCs. A procedure to establish the optimum squeeze casting of Al-MMCs is proposed. (Received February 16, 1998)
용탕단조법으로 제조된 SiCp / Al 복합재료의 입자거동특성과 기계적 성질
서영호,강충길 ( Young Ho Seo,Chung Gill Kang ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.1
N/A Fabrication of metal matrix composites(MMC_s) by casting processes are very promising of manufacturing near net hape components at a relatively low cost. One of them, the squeeze casting technique has characteristics such as fine microstructures as a result of the rapid cooling, low porosity and a good bonding between particle and base alloy. Therefore, this paper has been made to examine the microstructure and mechanical properties of fabricated Al-15%SiC_p composite by melt-stirring and squeeze casting method. Correlations between fabrication conditions and homogeneous dispersion of particles are investigated for SiC_p reinforced Al composites. The manufacturing parameters to homogenous mixing are crucible size, impeller size, temperature of molten metal, stirring time and stirring speed in melt-stirring process. The composites slurry containing SiC_p are pouring into a pre-heating die, and applied pressure in squeeze casting. The reinforcement dispersion state and fracture surface will be observed by the optical microscope and SEM. The primary product of MMC_s billet is prepared by squeeze casting condition for variation of applied pressure 70, 100, and 130㎫. By employing observed results systematically, correlation is proposed among the microstructure, particles behavior, mechanical properties and the processing parameters for an optimum melt-stirring and squeeze casting process of MMC_s
용탕단조법에 의하여 제조한 $SiC_p$/Al 복합재료의 2차 성형공정이 기계적 성질에 미치는 영향
서영호,강충길,Seo, Y.H,Kang, C.G 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.11
A metal matrix composites(MMCs) for A16061 reinforced with silicon carbide particles is fabricated by melt-stirring method. The primary products of MMCs billets are prepared by volume fractions 5 vol% to 20 vol% and particle size $13\mu m$ to $22\mu m$.This paper will be made to examine the microstructure and mechanical properties of fabricated $SiC_p$/Al 6061 composite by melt-stirring and squeeze casting method. The MMC billets is extruded at $500^{\circ}C$ under the constant extrusion velocity $V_e$=2mm/min using curved shape die. Extrusion force, particle rearrangement, micro structure and mechanical properties of extruded composites will be investigated. The mechanical properties of primary billets manufactured by melt-stirring and squeeze casting method will be compared with extrusion specimen. The effect of volume fraction and size of the reinforcements will be studied. The increase in uniformity of particle dispersion is the major reason for an improvement in reliability due to hot extrusion with optimal shape die. Experimental Young's modulus and 0.2% offset yield strength for the extruded MMCs will be compared with theretical values calculated by the Eshelby method. A method will be proposed for the prediction of Young's modulus and yield strength in $SiC_p$ reinforced MMCs.