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저온 분사 공정을 이용해 적층된 INCONEL 718의 계면접합 저해요인 분석
김재익(Jaeick Kim),이승태(Seungtae Lee),이창희(Changhee Lee) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.6
The cost for maintenance (replacement cost) of Ni-superalloy components in plant industry is very expensive because of high unit price of INCONEL 718. A development of repairing technology using kinetic spray process can be very helpful for reducing the maintenance cost. However, it is very difficult to produce welldeposited INCONEL 718 layer showing high interfacial bond strength via kinetic spraying. Thus, INCONEL 718 was deposited on SCM 440 substrate and the interfacial properties were investigated, in order to elucidate the cause of hindrance to the bonding between INCONEL 718 layer and SCM 440 substrate. As a result, it was revealed that the dominant obstacle to the interfacial bonding was excessive compressive residual stress accumulated in the coating layer, resulting from low plastic-deformation susceptibility of INCONEL 718. Nevertheless, the bonding state was enhanced by the post heat-treatment through relieving the residual stress and generating a diffusion/metallurgical bonding between the INCONEL 718 deposit and SCM 440 substrate.
저온 분사 공정을 통하여 형성된 Al/Ni 복합소재 코팅의 특성 평가
변경준,김재익,이창희,김시조,이성,Byun, GyeongJun,Kim, JaeIck,Lee, Changhee,Kim, SeeJo,Lee, Seong 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.5
Shaped charge(SC) ammunition is a weapon that penetrates directly the target by made jet from metal liner on impacting at a target. In SC, the liner occupies significantly important role causing an explosion and penetration of the target. The Al-Ni composite coating was deposited on copper liner in a solid state via kinetic spraying to improve the explosive force. The mechanical properties, reactivity and microstructure were investigated to confirm the possibility of kinetic sprayed Al/Ni composite coating as a reactive liner material. Reactive liner using Al/Ni composite exhibited much enhanced reactivity than pure copper liner due to Self-propagating High-temperature Synthesis (SHS) reaction with significantly improved adhesive bond strength. Especially, among the Al/Ni composite coatings, AN11 (the Al versus Ni atomic percent ratio is 1:1) showed the greatest reactivity due to its widest reaction area between deposited Al and Ni.
함정 전투체계 함상시험을 위한 지원장비 설계 및 검증 연구
정영란,김철호,한웅기,김재익,김현실,Jung, Youngran,Kim, Cheolho,Han, Woonggie,Kim, Jaeick,Kim, Hyunsil 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.3
The Shipyard Test of Naval Combat System depends on external factors, such as weather conditions and availability of its sensor-weapon, due to the need of on-board sensor-weapon during the test. This paper suggests the Supportive Equipment using virtual simulator for Shipward Test, in case of the unavailability of the on-board sensor-weapon or the test support force(aircraft, surface ship etc.), to pre-check the functions of the combat system as well as to prepare the Shipyard Test. To mock the real sensor-weapon functions as similar as possible, the Supportive Equipment for Shipyard Test was verified by the Verification and Validation process, which is usually performed while developing models in the Modeling & Simulation field.