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사형주조한 마그네슘합금 주물의 기계적 성질에 미치는 주조조건의 영향에 관한 연구
한윤성,천병욱,김홍범,최창옥 ( Yun Sung Han,Byung Wook Cheon,Hong Bum Kim,Chang Ock Choi ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.1
N/A The effects of casting conditions on the mechanical properties of sand cast magnesium alloy have been investigated by using various fluxes and pouring temperatures. The magnesium alloy castings has been performed : 1) magnesium alloy melt treated with flux 1 or 2 has been poured into the sand mold mixed with flux 3, at 700 or 750℃ and 2) magnesium alloy melt treated with flux 1 or 2 has been superheated at 900℃ for 15 minutes and cooled down to 700 or 750℃, followed by being poured into the sand mold with flux 3. The magnesium alloy castings at 700℃ shows a clean surface compared to that castings at 750℃, and moreover, the use of flux 3 prevented the oxidation and burning of the castings surface. The magnesium alloy castings at 750℃ contains more oxides around the grain boundries and more micro-shrinkage around the primary α-Mg dendrite compared to the magnesium alloy castings at 700℃. Grain boundaries were more fine in case of superheat treatment to 900℃. Also T4-treated magnesium alloy after superheating showed fine secondary dendrite arm spacing. The highest tensile strength, yield strength, elongation and hardness were shown in cast of pouring 700℃ following addition of flux 1 and 3, after superheating to 900℃, and these values were increased when T4 heat treatment was conducted as well.
Al-7Si 합급의 결정립 미세화에 미치는 TiC 첨가의 영향
한윤성 ( Yun Sung Han ),최창옥 ( Chang Ock Choi ) 한국주조공학회 2003 한국주조공학회지 Vol.23 No.2
N/A Al-Ti-C grain refiner form a relatively new alternative to the existing class of Al-Ti-B type grain refiners for achieving fine equiaxed structures in aluminum alloys during casting and solidification. The present study was carried out to investigate the influence of Al-Ti-C master alloys on the grain structure of Al-7Si alloys. The present study also investigates the relationship between grain refining efficiency and concentrations of Fe and Si in hypo-eutectic Al-Si alloys using Al-3Ti-0.13C master alloys. It is found that several parameters affect significantly the grain refining performance in silumin alloys. the present study reports the influence of various parameters such as alloy content, master alloy addition level, melt holding time and superheat on the grain refining efficiency in Al-7Si alloys.