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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.
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).
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.