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- 저자 : 김태영(Kim T.Y) (검색결과 94 건)
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자동차 부품 정밀가공면의 소성스트레인 측정을 위한 새로운 기법의 개발
김태영(T. Y. Kim),반야풍(Y. Iino),문상돈(S. D. Mun) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
Metal cutting leaves a plastically deformed layer in the precision machined surface in motor parts, such as torsion beam, rear axle and hole of engin piston. This residual phenomenon affects in various forms the physical properties of machined components such as the fatigue strength. the dimensional instability, microcracks and the stress corrosion cracking. There is an alternative way to determine the residual strain in plastically deformed materials by measuring the plastically deformed layer after a subsequent recrystallization process.<br/> The purpose of this investigation is to explore a new technique for measuring plastic strain in machining applications, and in particular, to find the effect of cutting parameters, on the plastic strains in motor parts.<br/>
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미결정 FeZrN 박막의 자기특성 및 내식성에 미치는 Cr 첨가 효과
김태영(T. Y. Kim),강남석(N. S. Kang),송기창(K. C. Song),조삼제(S. J. Cho),안동훈(D. H. Ahn) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.2
With the variation of Cr content and N₂ flow ratio, the soft magnetic properties, corrosion resistance and reactivity of the sputtered nanocrystalline FeZrCrN thin flims were investigated. In case of FeZrCrN thin films, a saturation magnetization was decreased with increasing N₂ flow ratio. In addition, good soft magnetic properties were obtained at the flow ratio of 3% N₂. The Fe_(64.9)Zr_(8.8)Cr_(5.8)N_(20.5) nanocrystalline thin film after annealing at 550℃ exhibited the saturation magnetization of 12.5kG, low coercivity of 0.4 Oe and high permeability of 2600 at 5㎒. Films containing up to 7.5% Cr showed an enhanced corrosion resistance and reduced reactivity with the bonding glass without degradation of soft magnetic properties, although the saturation magnetization was decreased slightly with the Cr addtion.
ScienceON
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