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김성오,최진일 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.12
To study the effect of silicon additions on the boronized depth, hardness and wear of the boronized layer, an electro-boronizing on the substrate such as electrolytic iron, ferritic and austenitic stainless steel has been carried out at the current density of 0.5A/㎠ and in the temperature range of 800-1000℃ for 1-5 hours. the findings from the experiment are summarized as follows. 1) Increased boronize depth was obtained with increased addition of silicon. excess silicon addition, however, inhibited the buronizing due to the increased viscosity of electrolyte. 2) Deeper boronized layer was resulted with ferritic than austenitic stainless steel. the boronized depth of the both stainless steels, however, were only one-third that of the electrolytic iron. 3) Wear resistance of the substrates was improved markedly by boronizing, showing the best result in the ferritic followed by austenitic stain-less steel and electrolytic iron.
Second Order Model for Free Surface Convection
김성오(Seong-O Kim) 한국전산유체공학회 1997 한국전산유체공학회지 Vol.2 No.2
VOF 방법에 의한 자유표면 유동계산의 정확성을 개선하기 위해 이차정도 모델을 개발하였다. 개발된 이차원 모델의 정확성을 비교하기 위하여 여러 가지 크기의 원형 및 Solitary wave 형상의 자유표면 유동을 통하여 기존에 개발된 두 가지의 일차정도 모델과 비교하였다. 비교결과 반경이 큰 원과 같이 곡률이 작은 형상의 경우에는 일차정도 모델도 비교적 정확한 결과를 보여주고 있으나 작은 반정의 원형이나 Solitary wave 와 같이 곡률이 큰 형상의 경우 일차정도 모델은 많은 오차를 보여주는 반면에 이차정도 모델은 어느 경우에나 매우 정확한 결과를 보여준다.
Second Order method for Free Surface Convectiona
김성오(Seong-O. Kim) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
To improve the numerical analysis of free surface convection and its reconstruction, a second-order algorithm was developed based on the volume of fraction method. The second-order method is compared with the first-order methods through the simulation of the convection for various sizes circles and solitary waves. For the small curvature of a free surface, e. g. circles with a large diameter, the first order method such as the FLAIR's and the centered slope method, show relatively good predictions. However, for large curvature configurations, the first order methods show large distortion of free surface. On the contrary, the second-order model always shows powerful prediction capabilities of free surface convection.