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마찰교반프로세스를 이용한 금속기 복합소재 제조 및 특성
최돈현,연윤모,정승부,Choi, Don-Hyun,Yeon, Yun-Mo,Jung, Seung-Boo 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.5
Friction stir processing (FSP), developed based on the basic principles of friction stir welding(FSW), a solid-state joining process originally developed for various metal alloys, is an emergingmetalworking technique that can provide localized modification and control of microstructures in near-surface layers of processed metallic components. The FSP causes intense plastic deformation, material mixing, and thermal exposure, resulting in significant microstructural refinement, densification, and homogeneity of the processed zone. The FSP technique has been successfully used for producing the fine-grained structure and surface composite, modifying the microstructure of materials, and synthesizing the composite and intermetallic compound in situ. In this review article, the current state of the understanding and development of FSP is addressed.
김광석,최돈현,정승부 한국마이크로전자및패키징학회 2014 마이크로전자 및 패키징학회지 Vol.20 No.2
Technology for high power devices has made impressive progress in increasing the current density of powersemiconductor, system module, and design optimization, which realize high power systems with heterogeneous functionalintegration. Depending on the performance development of high power semiconductor, packaging technology of highpower device is urgently required for efficiency improvement of the device. Power device packaging must provide superiorthermal management due to high operating temperature of power modules. Here we, therefore, review critical challengesof typical power electronics packaging today including core assembly processes, component materials, and reliabilityevaluation regulations.
마찰교반접합된 알루미늄 합금의 내식 특성에 관한 연구 동향
안병욱,최돈현,연윤모,정승부,Ahn, Byung-Wook,Choi, Don-Hyun,Yeon, Yun-Mo,Jung, Seung-Boo 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.2
Aluminum alloys have been considered for substantial use in these industries. This ensues from their attractive strength to weight ratio, superb formability, apposite weldability and acceptable corrosion resistance. Depending on the specific application, corrosion behavior is a significant factor of a welded joint. In this study, recent researches in the view of corrosion resistance of friction stir welded aluminum alloys are briefly reviewed.
안병욱,최돈현,연윤모,정승부,Ahn, Byung-Wook,Choi, Don-Hyun,Yeon, Yun-Mo,Jung, Seung-Boo 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.2
Ferritic stainless steels are widely used in the construction industry and in exhaust manifolds due to their low cost and relatively superior stress corrosion cracking resistance and pitting corrosion resistance compared to austenite stainless steels. Ferritic stainless steels are currently welded by various welding process including gas tungsten arc welding (GTAW), electron resistance welding (ERW) and laser beam welding. However, when these stainless steels are welded by fusion welding, some problems occur in the fusion zone (FZ) and heat affected zone (HAZ). First, the ductility of the weld is reduced due to the grain growth in the FZ and HAZ. Second, as its HAZ is frequently sensitized during welding, corrosion resistance deteriorates in this region due to the Cr depletion zone. To prevent these problems, it is recommended that ferritic stainless steels be welded with a low heat input. In this study, recent researches in the view of friction stir welded ferritic stainless steels are briefly reviewed.