http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
논문 : 기계적 성질 ; 도금용 고강도 강판의 강도에 미치는 합금원소의 영향
윤정봉 ( Jeong Bong Yoon ),장세기 ( Se Ky Chang ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.7
The effect of alloying elements on the mechanical properties was investigated to develop the high strength sheet steel for hot dip coating. Silicon and manganese were known as the elements deteriorating the wettability of molten zinc by oxide film formed during annealing. Therefore, phosphorous and titanium were added as solid solution and precipitation hardening element, respectively. The increase of strength by 0.01% addition of alloying element was as follows : 10.3MPa by P. 22.6MPa by Ti+14.7MPa by Ti+Nb. 0.77 MPa by Mn and 7.7MPa by C. An addition of phosphorous and titanium resulted in providing high strength steels and reducing amount of manganese addition.
윤정봉 ( Jeong Bong Yoon ),김성일 ( Sung Il Kim ),김인배 ( In Bae Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2008 대한금속·재료학회지 Vol.46 No.10
Conventional bake-hardenable(BH) steels should be annealed at higher temperatures because of the addition of Ti or/and Nb which forms carbides and raises recrystallization start temperature. In this study, the development of new BH steels without Ti or Nb addition has been reviewed. The new BH steels have nearly same mechanical properties as the conventional BH steels even though it is annealed at lower temperature. The steels also show smaller deviation of the mechanical properties than that of the conventional BH steels because of the conarol of solute carbon content during steel making processes. The deviation of mechanical properties in conventional BH steels is directly dependent on the deviation of solute carbon which is greatly influenced by the amount of the carbide formers in conventional BH steels. Less alloy addition in the newly developed BH steels gives economical benefits. By taking the advantage of sulfur and/or nitrogen which scarenge in Interstitial-Free or conventional BH steels, fine manganese sulfides or nano size copper sulfides were designed to precipitate, and result in refined ferrite grains. Aluminum nitrides used as a precipitation hardening element in the developed steels were also and resull in fine and well dispersed. As a result, the developed steels with less production cost and reduced deviation of mechanical properties are under commercial production. Note that the developed BH steels are registered as a brand name of MAFE(R) and/or MAF-E(R).
고순도강의 기계적 성질에 미치는 탄소 및 황 함량의 영향
윤정봉 ( Jeong Bong Yoon ),김성일 ( Sung Il Kim ),김인배 ( In Bea Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.6
To lower the annealing temperature and the deviation of the mechanical properties of bake hardening steels, high purity steels were investigated. The steels were characterized by treating at low recrystallization temperature. It was confirmed that the strengthening originated from the solid solution of carbon and the ferrite grain refinement by fine MnS precipitates as carbon and sulfur contents increased in high purity steels. However, it was observed that there was no more increase of strength in steels containing over 40 ppm of carbon. It was considered that the excess carbon formed either the carbon cluster or the low temperature unstable carbides which had the negligible effect on the strengthening because they were reported to be highly coherent with the matrix. The carbon cluster and unstable carbides could be transformed to the stable cementite during bake hardening treatment. MnS was not observed in the high purity steel containing 5 ppm S, resulting in very coarse recrystallized grains and good ductility. As sulfur content increased, the recrystallized grain size decreased due to the formation of the fine MnS precipitates. (Received January 7, 2009)
윤정봉 ( Jeong Bong Yoon ),조항식 ( Hang Sik Cho ),박영도 ( Yeong Do Park ),김양도 ( Yang Do Kim ),김영석 ( Young Seok Kim ),오원태 ( Weon Tae Oh ),남대근 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.3
The interfacial adhesion properties of enamel-coated, alloyed steels were in detail characterized by spectroscopic techniques. The surfaces of alloyed steels existed as oxidized states of Fe3O4. Therefore, the oxidized surfaces of the steels significantly interacted with the coated enamels for the adhesion. Ti-alloyed steel showed many micro-boundaries during thermal treatment and these micro-boundaries might cause the decline of the interfacial adhesion between enamel and steel. The depth profiles of enamel-coated, alloyed steels were investigated by GDS (glow discharge spectroscopy) and Ti component was found to be related to the interfacial adhesion between enamel and steel.
윤정봉 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.12
The strip temperature during cold rolling has been estimated by a mathematical model established in the present work. The model was evaluated on a selected steels of which compressive yield strength can be related to the total reduction ratio in terms of σ_c=A+B·γ_t (A and B are material constants) The followings are the results drawn. 1. The strip temperature after finishing cold rolling can be estimated by (수식) 2. The mean value of the difference between the estimated and the measured strip temperature was corresponded to 5.9% of the absolute value measured on the selected steel. 3. It has been found that the best effective way to control the strip temperature is the rolling schedule design.
선택적 자궁동맥 색전술을 이용하여 자궁경부 임신을 보존적으로 치료한 1예
허정수,이기수,정봉진,윤정신,정의중,황진석,권중혁 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.5
자궁경부임신은 자궁경관 내에 수정란이 착상하는 자궁외임신의 한 형태로서, 드물고 생명을 위협하는 경우이다. 자궁경관은 주로 섬유 조직으로 구성되며 자궁경부임신은 경관 조직 내 노출된 혈관으로부터 대량 출혈을 유발할 수 있다. 과거에는 자궁경부임신이 생명을 위협하는 출혈로 인해 흔히 자궁 적출술을 시행하였다. 최근에는 생식력 보존을 희망하는 경우에 있어서 소파 수술 전에 자궁동맥 색전술을 포함한 몇 가지 보존적 치료가 가능하게 되었다. 저자들은 자궁경부임신을 소파수술 전 선택적 자궁동맥 색전술을 시행하여 성공적으로 치료한 1예를 간단한 문헌 고찰과 함께 보고하는 바이다.