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박영태,권성원,강전홍 ( Y . T . Park,S . W . Kwon,J . H . Gang ) 한국센서학회 1996 센서학회지 Vol.5 No.3
A L DT is an electromechanical transducer that produces an electrical output proportional to The displacement of separate movable core. A convential LDT in construction has a disadvantage which the measurement range to the length ratio is small. This paper proposed a new type LDT, which improved methodes of construction. The proposed LDT and a conventional LVDT with the same dimension are simulated by FE. In the process of the simulation and construction, the performance of two type LVDTs are evaluated. Linearity error of a conventional LVDT was ±3 % in measuring range of ±5 mm and linearity error of the proposed LVDT was ±0.5 % in the same range. It was evident from the theoritical relationships and the experimental results that the proposed LVDT has been better performance than a convential type.
Incoloy 825 합금의 기계적 성질에 미치는 열간단조비의 영향
박영태 ( Y. T. Park ),정영훈 ( Y. H. Jeong ),강창룡 ( C. Y. Kang ) 한국열처리공학회 2016 熱處理工學會誌 Vol.29 No.6
This study was carried out to investigate the effect of hot forging ratio on the microstructure and mechanical properties of incoloy 825 alloy. Hot forging was carried out at the forging ratio of 0%, 60% and 90% respectively in a range of 900℃~1,140℃ and followed solution treatment was conducted at 1,000℃ for 1 hr. In all the specimens of hot forged of 0%, 60% and 90%, precipitates were not observed. The average grain size of 0% specimen is 82 μm and that of 60% and 90% is 56 μm and 31 μm, respectively. The range of grain size in the 0% specimen is uneven in 182 μm to 31 μm, but the grain size of 90% specimen is uniform. With increasing hot forging ratio, the mechanical properties such as tensile strength, elongation, hardness increased and impact toughness increased by grain refinement. (Received September 1, 2016; Revised September 7, 2016; Accepted September 21, 2016)
Incoloy 825 합금의 기계적 성질에 미치는 열처리의 영향
박영태 ( Y. T. Park ),김도훈 ( D. H. Kim ),강창룡 ( C. Y. Kang ) 한국열처리공학회 2017 熱處理工學會誌 Vol.30 No.3
This study was carried out to investigate the effect of heat treatment on the microstructure and mechanical properties in 90% hot forged Incoloy 825 alloy. With increasing solution treatment temperature, the grain size increased and the volume fraction of total precipitates decreased, and the precipitates disappeared at 1,000℃. With increasing aging time at 700℃, the volume fraction of precipitate increased and the precipitates size increased. Most of the precipitates consist Cr<sub>23</sub>C<sub>6</sub> carbide, and a small amount of TiC carbide was also observed. With decreasing solution treatment temperature and increasing aging time, tensile strength and hard-ness increased, and the elongation and impact value decreased. With increasing aging time, the impact value decreased sharply by the increased of the precipitate size. (Received March 17, 2017; Revised March 27, 2017; Accepted March 31, 2017)