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온간 ECAP 법에 의해 제조된 5083 Al 합금의 미세조직과 기계적 특성
강석봉,강효경,김향욱,Bachelard, L . 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.5
The microstructure and mechanical properties have been investigated on a commercial 5083 aluminum alloy processed by the equal-channel angular pressing (ECAP) at 473K. The microstructure of a single pass sample consisted of elongated subgrains. Increasing the number of pass led to very fine equilibrium grains having high angle grain boundaries. The 0.2% yield stress and hardness after a single pass increased greatly, and then kept constant with additional straining. On the other hand, the elongation to failure of a single pass sample decreased a little to compare with sample before ECAP, but there was no further reduction with additional straining. Recrystallization partially occurred in ECAPed 5083 aluminum alloy when annealed at 523K for 1 hr, and completely finished when annealed only at 573K for 1 hr. With increasing the number of pass, the onset temperature of recrystallization decreased and the rate of softening increased.
강석봉,김형욱,이수태 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.2
Aging behavior of Al-Mg-Si alloys with high silicon content was investigated in the present study. Excess silicon leads to unique aging behavior. The Al-Mg-Si alloys show seven exothermic peaks in DSC thermogram. These peaks seem to be induced by the formation of clustering of Si and Mg atoms, G-P zone, unknown small precipitates, β$quot; phase, B' phase, Si particle and β phase. The content of excess Si has no relationship with the precipitation of β$quot; phase and B' phase, but it affected on the formation of Si particles. Natural aging has a distinct influence on the subsequent precipitation process. It is proposed that the formation of stable silicon clusters during natural aging is the major reason for such an effect.
퍼스널 컴퓨터를 利用한 鐵筋콘크리트 構造設計의 電算化에 關한 硏究
강석봉 울산대학교 1984 연구논문집 Vol.15 No.2
本 論文은 準備計算, 構造解析, 部材設計로 이루어지는 鐵筋콘크리트 構造設計 過程을 퍼스널 컴퓨터를 利用하여 電算化하였다. 構造解析 方法은 컴퓨터 容量, 入力資料量等을 爲해 平面骨組에 對한 直剛性度法을 使用하였고 部材設計는 슬라브, 보, 기둥, 獨立基礎를 韓國 鐵筋콘크리트 規準에 맞도록 設計하였다. 主 프로그램과 資料處理 補助프로그램의 活用으로 여러 骨組와 荷重狀態에 對한 代案檢討가 容易하게 되었다. This paper proposes a personal computer program for the automation of the RC structural design process which consists of the preparatory calculation, the structural analysis and the member design. The direct stiffness method for plane frame is used for the reason of the computer capacity limit and the efficiency of data handling. Slabs, girders, columns and isolated spread footings are designed in accordance with the Korean Standard Building Code for RC. This program, with the aid of the subsidiary program for data handling, facilitates the process of reviewing alternatives and decision making.