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N/A In Al-Pb monotectic alloys Pb particles are difficult to uniformly distribute over the Al matrix because of the gravity segregation of pb element. Therefore the effects of centrifugally spray casting process on microstructures and distributions of Pb particle were investigated. As the preform thickened the sine of Pb particle became larger, the amount of porosity became lower and microstructures showed the change from spray-deposition microstructures in the lower part of the preform to spray-casting microstructures in the upper part of it. The size of Pb particles, amount of porosity and splat layer boundaries in hot forged preform showed still less than of as-deposited preform
In order to find out the casting conditions of the thin wall stainless steel exhaust manifold for automobile, the melt flow and solidification behavior simulated by the Z-CAST program were evaluated, and experimental casting result on the test casting and exhaust manifold of SSC13 alloy were investigated. From the results of this study, it was shown that the calculated results on fluid flow were in good agreement with practical thin wall test castings under the same casting conditions, as pouring metal is austenitic stainless steel(SSC13) and pouring temperature is 1575, 1630, and 1665℃ respectively. That calculated result with designed thin wall exhaust manifold was predicted filling up into the mold cavity, and practical casting was sound. The solidification simulation was predicted shrinkages at the bosses for original exhaust manifold, and designed it without bosses was predicted no defect. Therefore practical exhaust manifold casting was sound and in good agreement with calculated solidification results.
N/A Particle reinforced metal matrix composites(MMCs) via a centrifugal spray-cast deposition(CSD) process were fabricated by injecting second phase particles(Al₂O₃<40 )㎛, W<17.3 ㎛) into copper melt on the atomizing disc. Compositing modes were investigated by combining microstructures and mathematical modeling between Cu droplets and the reinforced particles injected. The Cu/W_P powders were shown that the W particles penetrate and get embedded in the Cu droplets. It is considered that the W particles composite preferentially in Cu melt on the atomizing disc. On the other hand, the Al₂O, particles did not penetrate into the Cu droplets on the atomizing disc but get attached in surface of Cu droplets during the flight. It is considered that the compositing may be attained in the flight distance which the relative velocity between Cu droplet and Al₂O, particle is maximum. The microstructure of the Cu/W_P and the Cu/(Al₂O,)_P composite preform was strongly influenced by compositing modes of droplets, and after subsequent deposition it was comprised as it is called the dispersed type and the cell type of microstructure,respectively. (Received July 24, 1997)
The effects of casting variables and alloying elements on the fluidity of thin wall cast stainless steels were investigated. Melts were poured into the sand molds to produce thin wall test castings. The length of it was 245㎜ and the thickness varied at the interval of 0.5 in the range of 1.6 to 2.6㎜. For the same casting condition, the fluidities of austenitic stainless steel, ferritic, precipitation hardenable and martensite ones were better in the order. The higher the pouring temperature, the shorter the pouring rate and the better the fluidity were. The fluidity was increased with the addition of Cr and decreased with W and Nb.
Ni-Cr-Mo 계 强靭鋼 鑄鋼品에 있어서 容接이음에 의한 機械的 性質이 低下되는 것을 용접時 豫熱과 後列 , 溶接後 Annealing, Quenching 및 Tempering 에 依하여 機械的 性質의 低下를 捕腕 할 수 있다판는 것을 檢사한 것으로써 그 結果는 다음과 같다. 1) 鑄造應力을 逝去한 試片 鎔接後 annealing, quenching 및 Tempering을 한 것에 對한 機械的 性質은 거의 비숫하다. 2) Annealing 에 전衣하여 연결 부의 應力을 逝去할 수 있으며 이에 應用된 過程을 鑄鋼品의 抉부급 脯修 에도 安全하게 應用될 수 있을 것이다. Generally Ni-Cr-Mo component systems decreases the mechanical properties during welding, therefore, in this study the development of mechanical properties during heat treatment after welding was investigated, that results were as follows: 1) The differences of mechanical properties between the specimen relieved casting stress and the one annealed, quenched. and tempered after welding didn't find. 2) The stress in parts received heat could be relieved by annealing treatment, and also this could be applied in the repair of defect in castings.