http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
고온 저주기 피로에 의한 STS 304 압연강재의 특성연구
김치환 ( C. H. Kim ),박영민 ( Y. M. Park ),배문기 ( M. K. Bae ),신동철 ( D. C. Shin ),김대원 ( D. W. Kim ),김태규 ( T. G. Kim ) 한국열처리공학회 2019 熱處理工學會誌 Vol.32 No.1
In this study, strain-controlled low cycle fatigue test for hot rolled STS304 steel was carried out at 400oC and 600oC, respectively. High temperature fatigue test was done using an electric furnace attached on the hydraulic fatigue test machine. The results of this study show that STS304 hot rolled steel has excellent static strength and fatigue characteristics. The hysteresis loop at half life was obtained in order to calculate the elastic and plastic strain. Also, Relationship between strain amplitude and fatigue life was examined in order to predict the low cycle fatigue life of STS304 steel by Coffin-Manson equation. (Received January 7, 2019; Revised January 14, 2019; Accepted January 24, 2019)
DLC 박막의 전기전도성, 투과율 및 가스베리어 특성에 관한 연구
박새봄 ( S. B. Park ),김치환 ( C. H. Kim ),김태규 ( T. G. Kim ) 한국열처리공학회 2018 熱處理工學會誌 Vol.31 No.4
In this study, the electrical conductivity, transmittance and gas barrier properties of diamond-like carbon (DLC) thin films were studied. DLC is an insulator, and has transmittance and oxygen gas barrier properties varying depending on the thickness of the thin film. Recently, many researchers have been trying to apply DLC properties to specific industrial conditions. The DLC thin films were deposited by PECVD (Plasma Enhanced Chemical Vapor Deposition) process. The doping gas was used for the DLC film to have electrical conductivity, and the optimum conditions of transmittance and gas barrier properties were established by adjusting the gas ratio and DLC thickness. In order to improve the electrical conductivity of the DLC thin film, N<sub>2</sub> doping gas was used for CH<sub>4</sub> or C<sub>2</sub>H<sub>2</sub> gas. Then, a heat treatment process was performed for 30 minutes in a box furnace set at 200℃. The lowest sheet resistance value of the DLC film was found to be 18.11 kΩ/cm<sup>2</sup>. On the other hand, the maximum transmittance of the DLC film deposited on the PET substrate was 98.8%, and the minimum oxygen transmission rate (OTR) of the DLC film of C<sub>2</sub>H<sub>2</sub> gas was 0.83. (Received July 10, 2018; Revised July 20, 2018; Accepted July 29, 2018)