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알루미늄의 첨가와 열처리가 연강의 응력부식성질에 미치는 영향
김신,변수일 한국부식학회 1981 Corrosion Science and Technology Vol.10 No.1
The effects of Al addition and heat treatment on the stress corrosion behaviour of mild steel (0.03∼0.04%) in the aqueous solution containing 860g Ca(NO₃)₂ 4H₂O and 30g NH₄NO₃ per liter of solution was studied at the boiling temperature (11℃) using constant strain method (U-bend specimen). The resistance to SCC (stress corrosion cracking) of mild steel was studied with various Al contents of 0%, 0.04%, 0.45%, 0.65%, 0.96%, 1.28% and 1.52% by weight after annealing at 1150℃ for 1h, then furnace-cooled to room temperature. The effect of heat treatments (furnace-cooled, oil-quenched, water-quenched, and water-quenched then tempered at 500f7 for 1h) m the resistance to SCC was studied with the specimens of 0.04% and 0.45% Al content. Induction period, crack propagation period and rate were determined by extrapolation of measured maximum crack depth at different exposure time to the corrosive environment. In this study incluction period and crack propagation rate are considered to be toe measure of resistance to SCC of mild steel. All specimens showed 1 or up to 3 crack on an U-bend specimen which propagated along grain boundary (intercrystalline SCC). For furnace-cooled specimens the resistance to SCC increased as Al content increased from 0% up to 0.65%, then decreased up to 1.52% Al. The two staged variation of the resistance to SCC in mild steel was discussed in terms of tendency of Al nitride formation and grain size of specimens respectively. Tempered specimens with Al contents 0.04% and 0.45% skewed higher resistance to SCC than water-quenched and this is considered to be due to the decrease in carbon concentration at the grain boundary.
김신 한국기업경영학회 2007 기업경영연구 Vol.14 No.2
글로벌기업은 다음과 같은 점에서는 전략적 통섭이 가능하다고 사료된다. 첫째, 글로벌기업의 전략유형을 분석한 결과 9개 글로벌 자동차기업이 표방하는 글로벌전략은 모두를 통섭하는 공통적인 전략을 수립하고 있음이 드러났다. 둘째, 글로벌 자동차기업의 글로벌전략의 목적은 새로운 시장창출 및 새로운 수요창출에 있음이 분석되었다. 셋째, 글로벌 자동차 기업들의 최대 목표는 해외거점기업에서의 생산과 효율성의 제고였다. 넷째, 글로벌거점기업에 생산 원자재와 중간부품공급 및 현지생산이 주요한 전략적 목표임을 알 수 있었다. 다섯째, 글로벌기업의 생존을 위해서는 연구개발 및 새로운 기술 개발이 큰 비중을 가지고 있음이 분석되었다. 여섯째, 새로운 자동차 모델개발이 가장 중요한 글로벌 전략이라는 것이 입증되었다 It seems that the global corporate could communicate strategically on the following points. First, it is appeared that the nine global corporate strategy to communicate with each other when analyzed strategic pattern of global company. Second, it is analyzed that the first purpose of global corporate is to create market and new demand. Third, the main goal of the global corporate is to make efficiency high and to increase productivity on the foreign offshore firm. Fourth, it is discovered that the main purpose of global offshore firm is supplying compartment and producting in host country. Fifth, it is analyzed that R&D and new technology development is representing major share for survival of global corporate. Sixth, it is proved that the most important global strategy is the development of new automobile model.