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Carbon Rich 분위기에서의 KHR45강의 침탄특성 평가 연구
임재균,양기모,임영언,Lim, Jae Kyun,Yang, Gimo,Ihm, Young Eon 한국재료학회 2013 한국재료학회지 Vol.23 No.5
In this study, an HP-mod. type(KHR-45A), which is used as a heater tube material in the pyrolysis process, was evaluated for its carburizing properties. It was confirmed from the microstructural observation of the tubes that the volume fraction of carbide increased and that the coarsening of Cr-carbide generated as a degree of carburization increased. The depth of the hardened layer, which is similar to the thickness of the carburized region of each specimen, due to carburization is confirmed by measurement of the micro-Vickers hardness of the cross section tube, which thickness is similar to that of the carburized region of each specimen. Two types of chromium carbides were identified from the EBSD (electron back-scattered diffraction) image and the EDS (energy-dispersive spectroscopy) analysis: Cr-rich $M_{23}C_6$ in the outer region and Cr-rich $M_7C_3$ in the inner region of tubes. The EDS analysis revealed a correlation between the ferromagnetic behavior of the tubes and the chromium depletion in the matrix. The chromium depletion in the austenite matrix is the main cause of the magnetization of the carburized tube. The method used currently for the measurement of the carburization of the tubes is confirmed; carburizing evaluation is useful for magnetic flux density measurement. The volume fraction of the carbide increased as the measuring point moved into the carburized side; this was determined from the calculation of the volume fraction in the cross-section image of the tubes. These results are similar to the trends of carburization measurement when those trends were evaluated by measurement of the magnetic flux density.
유기금속 화학기상증착법을 이용한 TiO<sub>2</sub> 나노선 제조
허훈회,웬티깅화,임재균,김길무,김의태,Heo, Hun-Hoe,Nguyen, Thi Quynh Hoa,Lim, Jae-Kyun,Kim, Gil-Moo,Kim, Eui-Tae 한국재료학회 2010 한국재료학회지 Vol.20 No.12
$TiO_2$ nanowires were self-catalytically synthesized on bare Si(100) substrates using metallorganic chemical vapor deposition. The nanowire formation was critically affected by growth temperature. The $TiO_2$ nanowires were grown at a high density on Si(100) at $510^{\circ}C$, which is near the complete decomposition temperature ($527^{\circ}C$) of the Ti precursor $(Ti(O-iPr)_2(dpm)_2)$. At $470^{\circ}C$, only very thin (< $0.1{\mu}m$) $TiO_2$ film was formed because the Ti precursor was not completely decomposed. When growth temperature was increased to $550^{\circ}C$ and $670^{\circ}C$, the nanowire formation was also significantly suppressed. A vaporsolid (V-S) growth mechanism excluding a liquid phase appeared to control the nanowire formation. The $TiO_2$ nanowire growth seemed to be activated by carbon, which was supplied by decomposition of the Ti precursor. The $TiO_2$ nanowire density was increased with increased growth pressure in the range of 1.2 to 10 torr. In addition, the nanowire formation was enhanced by using Au and Pt catalysts, which seem to act as catalysts for oxidation. The nanowires consisted of well-aligned ~20-30 nm size rutile and anatase nanocrystallines. This MOCVD synthesis technique is unique and efficient to self-catalytically grow $TiO_2$ nanowires, which hold significant promise for various photocatalysis and solar cell applications.
소진섭(So Jin-Sub),임재균(Lim Jae-Kyun),이대규(Lee Dae-Gyu),남기돈(Nahm Gi-Don),김주원(Kim Ju-Won),최형수(Choi Hyeong-Su),황상주(Whang Sang-Ju),윤차중(Yun Cha-Jung) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
It is said that the effect in wheels of freight car varies with the type of freight, the condition of operation, the braking device, and the type of bogie. The hardness of open wagon, gondola car, propylene car, covered freight car, container car and hopper car has been measured according to the mileage through this research. As a result, the wheel with more mileages after shaving off the wheel tread has a higher hardness than the others in the case of same type of car.
최병학,이범규,장현수,전우일,박용성,임재균,이진희,박찬성,김진표,Choe, Byung Hak,Lee, Bum Gyu,Jang, Hyeon Su,Jeon, Woo Il,Park, Yong Sung,Lim, Jae Kyun,Lee, Jin Hee,Park, Chan Sung,Kim, Jin Pyo 한국재료학회 2017 한국재료학회지 Vol.27 No.3
The aim of this study is to consider the effect hydrogen on dezincification behavior of Cu-Zn alloys. The investigations include microstructural observations with scanning electron microscope and chemical composition analysis with energy dispersive spectrometer. The dezincification layer was found to occur in high pressure hydrogen atmosphere, not in air atmosphere. In addition, the layers penetrated into the inner side along the grain boundaries in the case of hydrogen condition. The shape of the dezincification layers was porous because of Zn dissolution from the ${\alpha}$ or ${\beta}$ phase. In the case of stress corrosion cracks formed in the Cu-Zn microstructure, the dezincification phenomenon with porous voids was also accompanied by grain boundary cracking.
누설자속 측정에 의한 가스배관의 용접결함에 대한 비파괴 탐상
박수영(Soo Yung Park),유권상(Kwon Sang Ryu),김용일(Yong Il Kim),이완규(Wan Kyu Lee),임재균(Jae Kyun Lim),남영현(Young Hyun Nam) 한국가스학회 2008 한국가스학회지 Vol.12 No.2
용접 부위의 결함을 비파괴적으로 탐지하기 위하여 홀센서에 의해 누설자속을 측정할 수 있는 시스템과 4 종류의 용접결함을 갖는 기준시편을 제작하였다. 제작한 시스템으로 시편에 생성시킨 4 종류의 결함에서 누설된 자속을 측정하였고, 신호의 피크-피크 크기와 피크-피크 간의 간격에서 결함의 종류를 구분할 수 있는 가능성을 확인하였다. We have developed a system for nondestructive measurement of the magnetic flux leakage at welding flaws, existing in a gas pipeline by Hall sensor. For measuring the magnetic flux leakage, we designed a reference specimen having four kinds of welding flaws. Magnetic flux leakage is measured around the welding flaws of the specimen. The possibility for classification of different kinds of welding flaws is carried out by means of the peak-peak value and the interval between peak-peak of the magnetic flux leakage.