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FeTaNC 초미세결정박막의 반응가스 분압에 따른 자기특성 변화
고태혁(T. H. Koh),신동훈(D. H. Shin),김형준(H. J. Kim),남승의(S. E. Nam),안동훈(D. H. Ahn) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.3
Magnetic properties and microstructures of FeTaNC thin films, which were deposited by magnetron reactive sputtering method, were investigated as a function of CH₄ and N₂ gas partial pressures. Magnetic properties of FeTaNC films depended on total reactive gas pressure as well as CH₄/N₂ pressure ratios. For reactive gas partial pressures of 5~10%, optimum magnetic properties were observed in the FeTaNC films with proper CH₄/N₂ ratio. On the other hand, at 15 % of gas partial pressure, FeTaN and FeTaC films showed superior properties to FeTaNC films. Above 15%, the magnetic properties of films rapidly degraded due to an excess incorporation of C and/or N atoms. Excellent soft magnetic properties of 17 kG of Bs, 0.3 Oe of Hc, and 4000 of μ′ (at 5 ㎒) were obtained in the FeTaNC films. High permeabilities of FeTaNC films could be explained by the Fe lattice distortion caused by N atoms, hence reduction of magnetic anisotopy. While precipitated TaN and TaC particles effectively supress the growth of α-Fe grains leading to a good soft magentic properties, FeN and FeC phases such as Fe₃N, Fe₄N, Fe_xC have detrimental effects.
온간상태에서 비틀림변형에 의한 Cementite 의 구상화
남승의,이동녕 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.2
Spheroidization of cementite in eutectoid steel by concurrent warm torsional deformation has been studied with emphasis of the effects of the strain rate and the inter-lamellar spacing. Complete spheroidization could be achieved in 3 minutes when the strain rate and the deformation temperature were 1.76 percent/sec 700℃ respectively. The rate of the sphsroidization increased with increasing temperature at a given strain rate and lameller spacing. The coarse pearlite was more easily spheroidizad than the fine pearlite when other conditions were same.
이상 스테인리스강의 냉간가공 및 열처리에 의한 내식성 및 기계적 성질의 변화
김영식,남승의,박용수,황충호 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.7
Effects of cold work and aging treatment on corrosion and microhardness of duplex stainless steels were studies employing weight-loss tests, polarization tests and micronardness test. Degree of cold work applied were 15%, 30% and 40%, and temperatures for aging were 475℃, 600℃ and 800℃. Cold work enhanced the corrosion resistance, and this fact was attributed to decrease in the amount of ferrite and change in its configuration. Cold work higher than 15% was detrimental, because increase in defect concentration counteracted against the beneficial effects of ferrite. Aging treatment improved the corrosion resistance and the hardness. Spinodal decomposition at 475℃ and ferrite-austenite transformation at higher temperatures were attributed to the improvements. Applying 30% cold work followed by aging heat treatment at 475℃ was found the best in treating the duplex stainless steels studied.