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플라즈마 침탄한 저탄소 Cr-Mo강의 피로특성에 관한 연구
박경봉,신동명,이창열,이경섭,Park, Kyeong-Bong,Sin, Dong-Myung,Lee, Chang-Youl,Lee, Ktung-Sub 한국재료학회 2000 한국재료학회지 Vol.10 No.7
The carburizing behavior and fatigue properties of the plasma carburized low carbon Cr-Mo steel(0.176C-1.014Cr-0.387Mo) have been investigated. The effective case depth in plasma carburized steel increased up to 50% in comparison with that of gas carburizing, and this case depth increased with the increasing surface carbon content. With increasing time in plasma carburizing, the surface carbon content increased but its increasing rate decreased. Fatigue properties were studied in terms of microstructure, case depth, retained austenite and residual stress near the surface. The fatigue limit of the plasma carburized steel was higher than that of gas carburized one. The initiation of microcracks and initial crack propagation were retarded due to a relatively little surface and internal oxidation layer in plasma carburized steel. Fractography showed the crack initiated at the surface, and transgranular fracture at surface layer was more predominant in plasma carburized steel compared to that of gas carburized steel. 플라즈마 침탄한 저 탄소 Cr-Mo 강(0.176C-1.014Cr-0.387Mo)의 침탄 특성과 피로성질을 고찰하였다. 플라즈만 침탄한 시편의 유효경화깊이는 가스 침탄한 시편에 대해 상대적으로 침타나시간이 짧고 침탄온도가 낮음에도 불구하고 50%정도까지 증가되었다. 플라즈만 침탄시 유효경화깊이의 증가는 표면탄소농도의 증가와 같은 경향을 보였으며, 표면탄소농도의 증가와 같은 경향을 보였으며, 표면탄소농도의 증가율이 침탄시간의 증가에 따라 감소하였다. 플라즈만 침탄간의 피로한도는 가스 침탄강의 경우보다 높았다. 이를 표면근처의 미세구조, 경화깊이 잔류, 오스테나이트와 압축잔류응력으로 조사한 결과 경화깊이와 압축잔류응력의 차이가 거의 없었다. 따라서 플라즈만 침탄의 피로강도 향상은 가스침탄에 비해 표면이 상승층이 저감되어 표면에서의 미소균열의 발생 및 초기 균열 전파과정이 지연 되어진 것으로 판단된다. 파단면 관찰결과 표면에서 균열이 시작되고 플라즈마 침탄의 경우 입내파괴가 현저하였다.
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정화식(Jung Hwa-Sic),박경봉(Park Kyeong-Bong),박재홍(Park. Jae-Hong) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The passenger side entrance door is very important system that make boarding and getting off the passengers. During the passenger door closing there is some obstacles between door panels passenger door can detect the obstacle and obstacle is remained between door panels vehicle can no possible to move. But passenger door can not detect the obstacle if obstacle is too thin such as clothes and belts. So anti-drag system is applied the to make detect these thin obstacle. Therefore we survey the characteristic function and its activation scenario of anti-drag system and present the passenger door system that latest applied anti-drag system that can be a help to make design
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철도차량 바닥 구조 해석 (Structural analysis for floor structure of Rolling Stock)
김용태(Yong-Tae Kim),김명수(Myeong-Soo Kim),박경봉(Kyeong-Bong Park),박재홍(Jea-Hong Park) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5
The noise and vibration which are occurred by equipment and rail under the train are directly delivered to passenger and effect on comfort. For this reason, Floating floor structure has been applied to Rolling Sotck for minimizing the noise and vibration. And in respect of Floating floor, the strength is an important design element. Because the train has many heavy equipments and accommodates lots of passenger. At the early design stage of Floating floor, different joint type and thickness of plywood, etc. were applied and some problem happened. To solve the problems and apply to the future projects, the standard model of Floating floor structure was required. To find optimum design and standard model for Floating floor structure of Rolling Stock, the applied Floating floor models were analysed by CAE (computer-aided engineering)
ScienceON
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