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주조 합금 Alloy 718에서 미세조직과 인장특성에 미치는 열처리의 영향
도정현 ( Jeong-hyeon Do ),김인수 ( In-soo Kim ),최백규 ( Baig-gyu Choi ),정중은 ( Joong-eun Jung ),정인용 ( In-yong Jung ),조창용 ( Chang-yong Jo ) 한국주조공학회 2016 한국주조공학회지 Vol.36 No.5
The effect of various types of heat-treatment on the mechanical properties of cast Alloy 718 has been investigated. Cast Alloy 718 bars were subjected to ‘standard heat-treatment`_(SHT), ‘HIP (Hot Isostatic Pressing) heat-treatment`_(HHT), and ‘HIP-sim-ulated heat-treatment`_(HS). In the absence of long time high temperature heat-treatment, a small amount of Laves phase remained in the ‘SHT` specimen, and needle shaped δ precipitated in the vicinity of the Laves phase. Due to the formation of the Laves and δ phases in the ‘SHT` specimen, it exhibited lower tensile properties than those of the others_specimens. On the other hand, the Laves phase was completely dissolved into the matrix after ‘HHT` and ‘HS` treatments. It is known that isostatic pressure reduces the self-diffusion coefficient, because of the lower self-diffusivity under HIP conditions in the interdendritic region, Nb segregation and the high amount of γ” precipitation that occurs. Due to the higher fraction of coarse γ” phases, the ‘HHT` treated Alloy 718 showed excellent tensile strength.
니켈기 초내열합금의 열간노출에 따른 미세조직 및 기계적 특성 변화
김인수 ( In-soo Kim ),최백규 ( Baig-gyu Choi ),정중은 ( Joong-eun Jung ),도정현 ( Jeong-hyeon Do ),정인용 ( In-yong Jung ),조창용 ( Chang-yong Jo ) 한국주조공학회 2016 한국주조공학회지 Vol.36 No.5
The microstructural evolution of a cast Ni base superalloy, IN738LC, has been investigated after long term exposure at several temperatures. Most of the fine secondary γ` particles resolved after 2000 hour exposure at 816℃. At higher temperatures of 871℃ and 927℃, secondary γ` resolved after 1000 hours of exposure, and cuboidal primary γ` grew with exposure time. During the ther-mal exposure, σ phase formed at all tested temperatures, and η phase was observed around interdendritic regions due to carbide degeneration. The influence of microstructural evolution during thermal exposure on the mechanical properties has been analyzed. The effects of γ` particle growth are more pronounced on the high temperature creep properties than on the room temperature tensile properties.
진단에서 38mg 저용량 요소(13C-urea) 캡슐을 이용한 요소호기검사의 유용성
전훈재 ( Jeon Hun Jae ),김용식 ( Kim Yong Sig ),진윤태 ( Jin Yun Tae ),김한겸 ( Kim Han Gyeom ),현진해 ( Hyeon Jin Hae ),정인식 ( Jeong In Sig ),최명규 ( Choe Myeong Gyu ),김상우 ( Kim Sang U ),이인석 ( Lee In Seog ),박경신 ( Park 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<목적> Helicobacter pylori 감염의 비침습적 기준 진단법인 요소호기검사법(UBT)은 1987년 개발된 이후 진단기기의 개선과 요소용량, 검사시간, 시험식 등의 다양한 인자를 포함한 연구를 통해 진단의 정확도 및 편리성이 개선되어 왔다. 그러나 요소 75mg을 복용 후 30분에 호기를 채취하는 기존의 방법은 요소가 고가이며 검사 시간이 오래 걸리는 단점이 있다. 저자들은 최근 국내 바이오벤처인 ㈜메디켐스에서 개발, 상용화를 진행 중인, 요