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백민숙,강법성,백경철,김병일,윤동주,Baek, Min-Sook,Kang, Pub-Sung,Baek, Kyeong-Cheol,Kim, Byung-Il,Yoon, Dong-Joo 한국재료학회 2015 한국재료학회지 Vol.25 No.11
Super alloys, which can be divided into three categories, i.e. Ni-base, Co-base, and Fe-base alloys, are widely used for high temperature applications. Since superalloys contain many alloying elements and precipitates, their chemistry and processing parameters need to be carefully designed. In this study, we designed a new Ni alloy to prevent corrosion due to water vapor and gases at high temperatures. The new alloy was designed using the theoretical value of the resulting energy electronic state calculation($DV-X{\alpha}$ method). The components that were finally used were Cr, Mo, and Ti, with Ni as a base. For these alloys, elements were selected in order to compare their values with that of the average theoretical basis for an Inconel 625 alloy. Finally, two kinds of Ni alloy were designed: Ni-28Cr-4Mo-2Ti and Ni-20Cr-10Mo-1Ti.
백민숙(Min-Sook Baek),김용철(Yong-Cheol Kim),백경철(Kyeong-Cheol Baek),곽준섭(Joon-Seop Kwak),윤동주(Dong-Joo Yoon) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.3
In this study, the material used in the hot dip galvanizing equipment was poorly corrosion-resistant, so it was performed to solve the cost and time problems caused by equipment replacement. The theoretical calculation was performed using the DV-Xα method(Discrete Variational Local-density approximation method). The alloy (STS4XX series) of the equipment currently used has a martensite phase. Therefore, the theoretical calculation was performed by applying P4 / mmm, which is a tetragonal structure. The new alloy was chosen by designing theoretical values close to existing materials. Considering elements that contribute to corrosion, most have high prices. Therefore, the design was completed by adjusting the content using only the components of the reference material in the theoretical design. The final design alloys were chosen as D6 and D9. Designed D6 and D9 were dissolved and prepared using an induction furnace. After the heat treatment process was completed, the corrosion rate of the alloys was confirmed by using the potentiodynamic polarization test. The surface of the prepared alloys were processed horizontally and then polished to # 1200 using sand paper to perform potentiodynamic polarization test. Domestic products: 4.735 mpy (mils / year), D6: 0.9166 mpy, D9: 0.3372 mpy, alloys designed than domestic products had a lower corrosion rate. Therefore, the designed alloy was expected to have better erosion resistance.
이정렬(Lee, Jung Lyul),남수용(Nam, Soo Yong),백경철(Baek, Kyungchul) 한국연안방재학회 2014 한국연안방재학회 학술발표대회 논문집 Vol.2014 No.-
태풍이 통과할 때마다 각 해안은 침수 피해만큼 침식에 대한 우려가 날로 심각해지고 있다. 특히 연안역에 다양한 어항이나 항만 시설들이 들어서면서 태풍의 통과로 형성되는 다양한 파향 변화에 대하여 예기치 못한 심각한 침식이 유발되기도 한다. 본 연구에서는 DICEM 풍파 모형의 결과와 비디오 모니터링 자료를 분석하여 우리나라에 영향을 미치는 태풍의 진로 유형을 5가지로 구분하고 태풍의 통과에 따른 서해안, 남해안, 동해안마다의 파향 변화의 특성 조사를 통하여 침식 취약성을 분석한다.