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Joonoh Moon,Chang‑Hoon Lee,Hyo‑Haeng Jo,Sung‑Dae Kim,Hyun‑Uk Hong,Jun‑Ho Chung,Bong Ho Lee 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4
The microstructural evolution and fire-resistant properties in the weld heat-affected zone (HAZ) of Mo and Mo + Nb-addedfire-resistant steels were investigated. For this purpose, three Fe-0.1 wt%C-1.5 wt%Mn-0.1 wt%Si steels containing variousMo and Nb contents were prepared. HAZ samples were experimentally simulated using a Gleeble simulator at a welding heatinput of 30 and 300 kJ/cm. The yield strength of the HAZ samples was higher than those of base steels at both room temperatureand 600 ℃, whereas a greater decrease in the yield strength at 600 ℃ compared to that at room temperature occurred inthe HAZ samples than in the base steels, indicating that the fire-resistance deteriorated in the HAZs as compared to the basesteels. This is due to the formation of hard phases such as bainite and martensite in the HAZs, i.e., bainite and martensitephase have very high yield strength with high dislocation density at room temperature, while their strengths decrease rapidlyat high temperature due to a great annihilation and recovery of dislocations at high temperature. In addition, the fire-resistanceof the HAZ improved as the heat input was increased. The alloying of Mo and Nb improved the fire-resistance of both the basesteels and the HAZs. Finally, the changes in the microstructures of the base steels and the HAZs upon alloying and the heatinput and corresponding effects on the fire-resistance were carefully explored and discussed through transmission electronmicroscopy analyses, atom probe tomography analyses, and calculations of continuous cooling transformation diagrams.
제왕절개술 후 복부반흔 피하조직에 발생한 자궁내막증 2예
박태선 ( Park Tae Seon ),허인석 ( Heo In Seog ),이효원 ( Lee Hyo Won ),조윤영 ( Jo Yun Yeong ),박종배 ( Park Jong Bae ),강행지 ( Kang Haeng Ji ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.4
Endometriosis is generally confined to the pelvic viscera and the peritoneum, but it can proliferate in other areas like pleura, skin, extremities, lung, gallbladder, stomach, kidney and surgical scar. Scar endometriosis usually occurs in the surgical sca
광주지역 황사시 미세먼지 유입경로별 중금속 오염도 평가
양윤철,이세행,박병훈,조광운,윤상훈,박지영,장동,정지효,배석진,정숙경,Yang, Yoon-Cheol,Lee, Se-Haeng,Park, Byoung-Hoon,Jo, Gwang-Un,Yoon, Sang-Hoon,Park, Ji-Young,Jang, Dong,Chong, Ji-hyo,Bae, Seok-Jin,Jeong, Suk-Kyoung 한국환경과학회 2020 한국환경과학회지 Vol.29 No.1
The purpose of this study is to investigate the relationship of fine dust PM<sub>10</sub> and heavy metals in PM<sub>10</sub> in Asian dust flowing into Gwangju from 2013 to 2018. The migration pathways of Asian dust was analyzed by backward trajectory analysis using HYSPLIT (Hybrid Single Particle Lagrangian Integrated Trajectory) model, and the change of heavy metal concentration and heavy metal content per 1 ㎍/㎥ of fine dust PM<sub>10</sub> in Gwangju area were analyzed. Also, the characteristics of the heavy metals were analyzed using the correlation between the heavy metals in PM<sub>10</sub>. As a result of analyzing Asian dust entering the Gwangju region for 6 years, the average concentration of PM<sub>10</sub> measured in Asian dust was 148 ㎍/㎥, which was about 4.5 times higher than in non-Asian dust, 33 ㎍/㎥. A total of 13 Asian dust flowed into the Gwangju during 6 years, and high concentration of PM10 and heavy metals in that were analyzed in the C path flowing through the Gobi/Loess Plateau-Korean Peninsula. As a result of the correlation analysis, in case of Asian dust, there was a high correlation between soil components in heavy metals, so Asian dust seems to have a large external inflow. On the other hand, in case of non-Asian dust, the correlation between find dust PM<sub>10</sub> and artificial heavy metal components was high, indicating that the influence of industrial activities in Gwangju area was high.
초고강도 자동차용 강의 환원정전류인가에 따른 산화 거동 변화 연구
하헌영 ( Heon-young Ha ),김혜진 ( Hye-jin Kim ),문준오 ( Joonoh Moon ),이태호 ( Tae-ho Lee ),조효행 ( Hyo-haeng Jo ),이창근 ( Chang-geun Lee ),유병길 ( Byung-kil Yoo ),양원석 ( Won-seog Yang ) 한국부식방식학회 2017 Corrosion Science and Technology Vol.16 No.6
The change in the oxidation behavior of three types of B-added ultrahigh strength martensitic steels containing Ti and Nb induced by applying constant cathodic current was investigated. In a 3% NaCl+0.3% NH<sub>4</sub>SCN solution, the overall polarization behavior of the three alloys was similar, and degradation of the oxide film was observed in the three alloys after applying constant cathodic current. A significant increase in the anodic current density was observed in the Nb-added alloy, while it was diminished in the Ti-added alloy. Both Ti and Nb alloying decreased the hydrogen overpotential by forming NbC and TiC particles. In addition, the thickest oxide film was formed on the Ti-added alloy, but the addition of Nb decreased the film thickness. Therefore, it was concluded that the remarkable increase in the anodic current density of Nb-added alloy induced by applying constant cathodic current density was attributed to the formation of the thinnest oxide film less protective to hydrogen absorption, and the addition of Ti effectively blocked the hydrogen absorption by forming TiC particles and a relatively thick oxide film.