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임수근,윤병은,장동훈,엄정필,김득규 慶尙大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.13 No.-
In this study, microstructure, size of primary α, solid fraction and hardness of A356 Al alloy were investigated. Semi-solid A356 alloys were obtained by semi-solid continuous casting apparatus consists of melting furnace, formation apparatus of granular primary α and continuous casting apparatus. Size of primary α and solid fraction were decreased with decreasing temperature, and with increasing volume of cooling water. At the cooling water temperature of 15℃ and cooling water volume of 18.2ℓ/min, the sizes of primary α phases were decreased up to 40㎛, and fraction solid was 0.68.
균일가열법으로 제조한 반용융 A390합금의 미세조직 및 성형성
임수근,윤병은,장동훈,엄정필,김득규 慶尙大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.13 No.-
Microstructure of hypereutectic Al-17wt.% Si alloy, fabricated by mechanical stirring and by reheating at semi-solid state, was investigated by optical microscope. Flow behavior semi-solid metal also was investigated at diffentent mould temperatures 280℃, 290℃ and 300℃ . Size of silicon particles were increased over 100㎛ durig solidification as a result of stirring. It is considered as microstructural coarsening by bonding between neighbouring primary silicon particles during stirring of slurry. In case of reheating at semi-state, however, primary silicon particle was not increased at size of 40㎛ and nearly spherical aluminum solde particle also was improved when solid fraction was 0.7 at mould temperature of 300℃ than other conditions.
한지훈(Ji Hun Han),김득규(Deck Kyu Kim),최형권(Hyoung Gwon Choi) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this paper, the unsteady incompressible Navier-Stokes equation coupled with energy/radiation equations was solved in order to investigate the thermal stimulation of a laser heater using an ANSYS-FLUENT. The laser heater has been used to substitute a traditional moxibustion. The temperature profiles inside skin were examined when the infrared laser was emitted onto the skin. It has been shown that the maximum temperature exists just below skin surface since the absorption coefficient of skin is biggest in epidermis and that the temperature inside skin decreases as the monitored position goes to the depth of skin. The present numerical results are qualitatively in agreement with those of experiment.