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이재경(Jae Kyung Lee),최정길(Jeong Kil Choi),홍준표(Chun Pyo Hong) 한국주조공학회 1999 한국주조공학회지 Vol.19 No.2
N/A It was found through the experimental approach for Al alloys that long freezing range alloys (LFRA) have a tendency to show the dispersed porosity distribution over the casting. In the present numerical analysis, the prediction parameters used in short freezing range alloys (SFRA), such as t_f, G and G/√R are not applicable to describe the porosity formation for LFRA. Thus fluid critical solid fraction, fs-critical was utilized as a prediction parameter to evaluate the porosity formation for LFRA quantitatively. It was shown that the calculated results using fs-critical were in good agreement with those of test castings with the cylindrical geometry. It was concluded that fs-critical successfully predicts the detailed porosity formation behavior for LFRA in correlation with the concept of potential shrinkage. (Received February 5, 1999)
주형하강식 일방향 응고시 결정성장에 미치는 Grain Selector 의 영향
이재경,최학규,홍준표 ( Jae Kyung Lee,Hack Kyu Choi,Chun Pyo Hong ) 한국주조공학회 1989 한국주조공학회지 Vol.9 No.2
N/A This study was carried out on single crystal growth in the mold-withdrawal type unidirectional solidification. The effects of grain selectors on the microstructural morphology were investigated. A two-dimensional heat transfer model was developed to simulate the relationship between thermal parameters and growth morphology. Single crystal can be grown by proper design of grain selector in this method.
파라메트릭 모델에 의한 주강의 수축공 결함 예측의 Quality Criteria
이재경,최정길,홍준표 ( Jae Kyung Lee,Jeong Kil Choi,Chun Pyo Hong ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.1
N/A Criteria functions using the prediction parameters, such as t_f, G and G/√R which can be evaluated from the heat transfer and solidification analyses of castings, are of great importance in the prediction of shrinkage defects in steel castings. The critical values of these prediction parameters are found to be dependent upon the shape and size of castings. A new additional parameter, shrinkage potential, was proposed to evaluate the formation of shrinkage defects quantitatively. A coupling method of the prediction parameters with shrinkage potential was adopted to predict shrinkage defects in steel castings. The calculated results on several castings were compared with the experimental castings. (Received January 14, 1998)
주형하강식 일방향 응고시 결정성장에 미치는 Crystal selector 의 영향
이재경,홍준표 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.7
The effect of crystal selector on the growth morphology of pure Al and Al-Ni eutectic alloys was investigated in the mold-withdrawal type unidirectional solidification. It was concluded that the proper type of crystal selector is effective both for growing single crystals and for controlling microstructures of eutectic composites.