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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korea Foundry Society
Journal Basic Information
Journal DOI :
The Korean Foundrymens Society
Editor in Chief :
Volume & Issues
Volume 11, Issue 6 - Dec 1991
Volume 11, Issue 5 - Oct 1991
Volume 11, Issue 4 - Aug 1991
Volume 11, Issue 3 - Jun 1991
Volume 11, Issue 1 - Feb 1991
Volume 11, Issue 2 - 00 1991
Selecting the target year
권두언 : 젊은 주조기술자에게 희망을 ……
Lee, Gye-Wan ;
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 179~179
Rapidly Solidified Powder Metallurgy Aluminum Alloys for Aerospace Applications
Cho, S.S. ;
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 181~192
Gravity Tilt Die Casting of Brass
Kim, S.D. ; Lee, Z.H. ;
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 193~196
Long-term Cupolas;a Comparison of the Familiar Furnace Systems.
Park, L.Y. ;
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 197~207
1991년도 연구비 신청
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 207~207
Solidification Characteristics of Squeeze Cast Al Alloy Composites
Kim, Dae-Up ; Kim, Jin ; Park, Ik-Min ;
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 208~216
The solidification behavior of the squeeze cast composites of aluminum alloys reinforced with boron fiber(
) and silicon carbide fibers(
) were investigated. Al-4.5wt%Cu and Al-l0wt%Mg were chosen for the matrix phase of the composites. In the squeeze cast specimen with high thermal difference between fiber and melt, the average secondary dendrite arm spacing(DAS) in reinforced alloy is smaller than that in unreinforced alloy. It was also observed that primary
and non-equilibrium eutectic, which seems to be penetrated and solidified at the final stage of the solidification of the matrix, are irregularly distributed around fibers. It is considered that cold fibers serve as heterogeneous nucleation site. While in the remelted and resolidified specimen without temperature difference, the DAS was not changed with reinforcement and microstructure reveals non-equilibrium eutectic with relatively uniform thickness around fibers. It might be evident the nucleation starts at interfiber region. Microsegregation decreases with the decrease in cooling rate and with reinforcement in the as-squeeze cast specimen. Al-10wt% Mg alloy shows less microsegregation than Al-4.5wt%Cu alloy.
Development and Control Technology of Austempered Ductile Irons with High Strength and High Toughness for Automotive Cam Shaft.
Kim, Jae-Yun ; Kang, Dong-Myoung ; Ahn, Sang-Uk ; Kim, Kwang-Bae ; Kang, In-Chan ;
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 217~227
The present study was conducted to estimate the fatigue crack growth rate of the Mo-Ni alloyed ductile cast iron for the influence of austempering temperature and time. The fatigue crack growth rate was affected by retained austenite. Retained austenite volume were higher with the ductile cast irons which were austempered at
than austempered at
, and the fatigue crack growth rate of the former was lower than that of the latter. Also, the fatigue growth rate of the former was the lowest at austempering for 1 hour and that of the latter was the lowest at austempering for 3 hours.
Effect of Matrix Structures on the Fracture Characteristics of Austempered Ductile Iron
Kim, Chang-Gyu ; Choi, Chang-Ock ;
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 228~235
The Effects of the matrix structures and the amount of the retained austenite in austempered ductile iron(ADI) which contains Ni, Cu and Mo on fracture characteristics were inverstigated. The structures were changed from lower bainite to mixture of Lower and upper bainite, and then to upper bainite as austempering temperature increased. A higher austempering temperature yielded lower tensile strength and hardness, but higher impact valve and
. In addition, the amount of the retained austenite increased with the austempering temperatures. Fracture surface showed a fibrous pattern and a dimple pattern with increasing the retained austenite amount.
Nucleation and Growth of Graphite Crystal of Levitation Melted High Purity Fe-C-Si Alloys
Kim, Young-Jig ; Shur, Su-Jeong ;
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 236~244
This paper describes a study of the nucleation and growth of graphite crystal of levitation melted high purity Fe-C-Si alloys with emphasis on hypereutectic composition. Spherulitic graphite was observed to form at high purity alloy and converted to compacted by changing the starting iron from ultra-pure zone refined iron to 99.95 pct electrolitic iron. Residual C-C clusters might be acting as an effective nucleation site for graphite, and sulphur was the element to prevent graphite from nucleating. The graphite morphology changed from compacted to spherulitic as the sulphur content decreased.
A Study on the Thermal Stresses Analysis of the Flat Mould
Min, Soo-Hong ; Koo, Bon-Kwon ; Kim, Ok-Sam ;
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 245~253
It is known that the analysis of thermal stresses is substantially important in optimal design of casting mould. In this paper unsteady state thermal stresses generated in ingot and mould during the solidification process are analyzed by the two dimensional thermal elasto-plastic analysis. Distribution of temperature and stress of the mould is calculated using the finite element method and compared with experimental result. The significant results obtained in this study are as follows. At the early stage of the casting process, abrupt temperature change was shown in the vicinity of the inner surface of the mould. The largest temperature gradient is occurred at the corner of the mould. In the thermal stress analysis, compressible stress occurred in the inside wall of the mould where as tensile stress on outside wall. Smaller thermal stress is observed at the rounded corner. It is also observed that the shown is influenced by the thickness of the wall. A fairly good coincidence is found between analytical and experimental results, showing that the proposed analytical methodology is reliable.
KOREA CHEMICAL CO., LTD.
Journal of Korea Foundry Society, volume 11, issue 3, 1991, Pages 256~256