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편정합금계에서 응고조직의 균질화에 미치는 공정조건의 영향 - 균질화수의 계산 및 응용 -
염광현,윤우영,강춘식,이진형,백홍구 ( Kwang Hyun Yum,Woo Young Yoon,Chun Sik Kang,Jin Hyung Lee,Hong Ku Baek ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.5
N/A The miscibility gap in the monotectic system results in a macro segregation due to the gravity. In this study, the homogenization number, H was introduced to predict the condition of producing the homogeneous alloy which has fine, well-distributed minor particles in the matrix. Nucleation, particle growth, surface energy, sedimentation, flotation, and free convection were taken into account to develop the dimensionless H number. The H number was calculated numerically on various g-levels, cooling rates, sample sizes, and alloy compositions. Simulation results showed that homogeneity of the monotectic alloy was affected mainly by miscibility gap(composition), decomposition time and gravity.
Cu-Pb 계에서의 응고 조직에 미치는 공정조건과 합금의 균질화 - 균질화수의 실험적 고찰 -
염광현,백윤길,윤우영 ( Kwang Hyun Yum,Yoon Kil Baek,Woo Young Yoon ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.5
N/A The microstruture of the Cu-Pb monotectic system which solidified under various cooling conditons and gravity coefficients were analyzed. The so called Homogenization number which was comparing the relative influences of gravitational and Marangoni force, nucleation and growth of liquid (or solid) particles, natural convection and dimension of specimen on morphological behaviors of solidified monotectic system could be used successfully to rationalize the microstructures. Under one atmosphere condition, the macrosecregation between Cu and Pb occurred mainly due to the sedimentation (or cooling) time. On the other hand, the gravitational force (Stoke`s force) was the major considering parameter to homogenize the specimen under microgravity condition.