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경사냉각판을 이용한 반응고 알루미늄 합금의 미세조직 및 성형성 평가
황범규,김순국,김덕현,임수근 한국주조공학회 2019 한국주조공학회지 Vol.39 No.5
This study investigated the microstructure properties of A356 and AC8A alloys with a rheocasting mold using an inclined cooling plate. In addition, a formability evaluation was performed according to the solid fraction. Regardless of the position, the overall microstructure was shown to be uniform and a finer crystal structure was obtained as the solid fraction increased. The study confirmed that the molding pattern changed according to the solid fraction and that the spherical α-Al and eutectic α were identified. The results of the formability according to the solid fraction of A356 and AC8A alloys were similar to the simulation results.
황범규(B. K. Hwang),이영선(Y. S. Lee),문영훈(Y. H. Moon),김대용(D. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
The purpose of this paper is to investigate the effect of annealing treatment on cold formability of magnesium alloy sheet AZ31. The AZ31 sheets with there different thickness (1.0t, 1.6t, 2.0t) were annealed at three different temperatures (345℃, 400℃ and 450℃). The mechanical properties and microstructure evolution of the annealed AZ31 were examined as well as limit dome height (LDH) and compared with those of as received one. The cold formability was enhanced but the strength was deteriorated by the annealing treatment.
고주파 유도 가열을 이용한 열간 파이프 벤딩품(저탄소강)의 기계적 성질 연구
황범규(B. K. Hwang),우타관(T. K. Woo),김두영(D. Y. Kim),문영훈(Y. H. Moon),권용남(Y. N. Kwon),이영선(Y. S. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
Recently, A hot pipe bending process using High-frequency induction heating which has a small bending curvature of the bend without creating a mold having the small bending curvature and the bend production process of the large tube is widely used in the power generation, shipbuilding and plant construction industry. In this study, after the pipe bending using high-frequency induction heating, the quality change of the pipe was analyzed by considering direction. The fatigue endurance test was performed to obtain reliability from the life of the straight part and deformed part on the pipe. Also the tests were performed to obtain the effect of fatigue limit under the microstructure and hardness.
Mg-Al-SUS 클래드 판재의 온간 드로잉성에 대한 해석 기법과 실험적 연구
황범규(B. K. Hwang),이영선(Y. S. Lee),정택우(T. W. Jung),김대용(D. Kim),문영훈(Y. H. Moon) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
The Clad sheet is made roll-bonding process of the one or more material with the different property. Good formability is an essential property in order to deform a clad metal sheet to a part or component. In this study, the mechanical properties and formability of a Mg-Al-SUS clad sheet are investigated. The clad sheet was deformed at elevated temperatures because of its poor formability at room temperature. Tensile tests of the each material and clad sheet were performed at various temperatures and at various strain rates. The limited draw ration (LOR) was obtained using a deep drawing test to measure the formability of the clad sheet. A finite element (FE) analysis was performed to predict formability of the cup drawing product, one_layer model and three_layer model.