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열처리에 따른 Zircaloy-4 Tube의 부식특성에 관한 연구
이동복,최송천 成均館大學校 科學技術硏究所 1994 論文集 Vol.45 No.1
열처리에 따른 Zircaloy-4 tube의 부식 특성을 조사하기 위하여 pilger된 시편, 수냉된 시편, 열처리된 시편에 대해, 500℃, 102 기압의 증기하에서의 부식 시험을 실시하였다. 주어진 시험조건하에서 수냉된 시편과 pilger된 시편은 좋은 nodular 부식 저항을 보였으나, 열처리된 시편은 나쁜 nodular 부식 저항을 가졌다. To investigate the effect of heat treatment on the corrosion behavior of water-quenched, heat -treated, and as-pilgered Zircaloy-4 tubes, corrosion testing was conducted at 500℃ in 102 atm of steam atmosphere. Under these given conditions, water-quenched and as-pilgered and the grains become bigger and equiaxed. Heat treated specimens exhibited improved resistance to nodular corroson, while heat- treated specimens had poor nodular corrosion resistance.
遼末女眞社會의 構成 (Ⅰ) : 黑水와 黑水靺鞨 Focused on River Hei-shui˘(黑水) and Hei-shui˘-mo-he (黑水靺鞨)
李東馥 淸州大學校 1984 論文集 Vol.17 No.1
The people who founded Chin (金) dynasty were Sheng-nuzhens (生女眞). The main part of Sheng-nuzhens were Hei-shui-mo-he-rens (黑水靺鞨人) who had been living on the lower part of River Song-hua(松花江) in the east side of I-lan (依蘭) ever since both the period of Sui (隋) and Tang (唐) dynasty. The reason why the people were called Hei-shui-mo-he was due to the fact they lived around River Hei-shul(黑水). River Hei-shui has customarily been recognized as River Hei-long(黑龍江) of today, but in fact it indicates the lower areas of River Song-hua in the east part of I-lan. In the early 10th century, when Bo-hdi(渤海) dynasty had been declined, Hei-shuimo-he-rens, who had lived in the lower areas of River Song-hua at that time, expanded their power and pushed into Manchuria(滿洲). Their expansion of influence was much active around the time when Bo-hai dynasty was to be declined. When the Hei-shui-mo-he-rens advanced into the whole areas of Manchuria in the late period of Liao dynasty, they became the essential and major part of the people who founded the Sheng-nuzhen society.
High-Temperature Oxidation of AZ91-0.3%Ca-0.1%Y Alloy in Air
이동복,Muhammad Ali Abro,유봉선 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.4
AZ91 magnesium alloys containing 0.3% Ca and 0.1% Y were cast, and their oxidation behavior was investigatedbetween 425 and 600 °C in atmospheric air to examine roles of Ca and Y during oxidation. During casting, Caformed Al2Ca particles intergranularly, and reduced the amount of Al12Mg17 particles, while most of yttriumexisted as Al2Y particles inter- and intra-granularly in the alloy. The AZ91 alloy oxidized fast above 425 °C, leadingto complete ignition. By contrast, AZ91-0.3Ca-0.1Y alloy oxidized very slowly up to 550 °C. Calcium, whichis more active than Mg, preferentially oxidized to CaO at the surface of the MgO-rich oxide to suppress the oxidation,evaporation and diffusion of Mg during the initial oxidation stage. Such suppression was due to the quitelow vapor pressure and high stoichiometry of CaO. Calcium also suppressed the formation of less oxidation-resistantAl12Mg17 through forming oxidation-resistant Al2Ca in the alloy from the initial oxidation stage.