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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korea Foundry Society
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Journal DOI :
The Korean Foundrymens Society
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Volume & Issues
Volume 26, Issue 6 - Dec 2006
Volume 26, Issue 5 - Oct 2006
Volume 26, Issue 4 - Aug 2006
Volume 26, Issue 3 - Jun 2006
Volume 26, Issue 2 - Apr 2006
Volume 26, Issue 1 - Feb 2006
Selecting the target year
Basis of Gating System & Risering on Iron Castings for Primary Engineers - Part V -
Matsuda, Masao ;
Journal of Korea Foundry Society, volume 26, issue 5, 2006, Pages 197~204
A Study on the Structural Controlling of Al-Si Alloy by Using Electromagnetic Vibration
Choi, Jung-Pyung ; Kim, Ki-Bae ; Nam, Tae-Woon ; Yoon, Eui-Pak ;
Journal of Korea Foundry Society, volume 26, issue 5, 2006, Pages 205~210
The structural control of Al-Si alloy, which was not studied among various electromagnetic processing of materials, was considered applying the alternating current and direct current magnetic flux density. The main aim of the present study is to investigate the effects of electromagnetic vibration on the macro and microstructure of Al-Si alloy in order to develop a new process of structural control in Al-Si alloy. When the electromagnetic vibration is conducted for changing the shape of primary aluminum, at low frequency(>60Hz), the shape of dendrite is changed speroidal shape. When the electromagnetic vibration is conducted for changing the shape of eutectic silicon, the fact that a morphological change of the eutectic silicon from coarse platelet flakes to fine fiber shape is observed and the improvement of the mechanical properties is achieved with EMV (Electro Magnetic Vibration) process at high frequency(>500Hz).
Development of Thixoextrusion Process for Light Alloys - Part 1. Microstructural Control of Light Alloys for Thixoextrusion
Kim, Shae-K. ; Yoon, Young-Ok ; Jang, Dong-In ; Jo, Hyung-Ho ;
Journal of Korea Foundry Society, volume 26, issue 5, 2006, Pages 211~216
The study for thixoextrusion process of 7075, 7003 Al wrought alloys and AZ31 Mg wrought alloy was carried out with respect to reheating rate, isothermal holding temperature and time with an emphasis to the effect of homogenization on thixotropic micro-structures during the partial remelting, especially in the low liquid fraction ($f_L<0.2$). The liquid fraction and average grain size with respect to reheating profile such as reheating rate, isothermal holding temperature and time were almost uniform. It is considered very useful for thixoextrusion in terms of process control such as billet temperature control and actual extrusion time. Micro-structural controls of 7075, 7003 Al wrought alloys and AZ31 Mg wrought alloy before and after homogenization were available and thixotropic microstructures were obtained in both specimens.
Development of Thixoextrusion Process for Light Alloys - Part 2. Thixoextrusion Process for Light Alloys
Kim, Shae-K. ; Yoon, Young-Ok ; Jang, Dong-In ; Jo, Hyung-Ho ;
Journal of Korea Foundry Society, volume 26, issue 5, 2006, Pages 217~221
The main emphasis of this study was to utilize thixoextrusion process for improving extrudability of 7075, 7003 Al wrought alloys and AZ31 Mg wrought alloy. The results of thixbextrusion experiments about microstructures and extrusion pressures were compared with conventional hot extrusion results. The maximum extrusion pressure of thixoextrusion was greatly decreased compared with that of conventional hot extrusion. It was pointed out that the extrusion temperature dependence of the maximum extrusion pressure was large and the influence of extrusion temperature on the improvement of extrudability was remarkable in thixoextrusion. This will contribute to extrudability in terms of extrusion pressure, which in turn means that shorter process time is required and smaller extrusion machine can be applied for the same operation. The elongated grains to extrusion direction were generally observed during conventional hot extrusion, while the thixoextruded microstructures were isotropic.
Fabrication Characteristics of Slag Fiber by 4 Wheel System
Song, Yeong-Hwan ; Seong, Hwan-Goo ; Park, Soo-Han ; Wang, Xiaosong ; Hur, Bo-Young ;
Journal of Korea Foundry Society, volume 26, issue 5, 2006, Pages 222~226
Steel making slag has gained a considerable attraction as one candidate of eco-materials in research fields for recycling resources. Thus, many researches have been performed but were limited to development of substitute for cement being used in the construction field. A little research work also has been done on development of higher value-added materials, including heat resistant and sound absorbing materials. For this reason, the present study were focused on macrostructure characterization of fabricated slag fibers which are applicable to heat resistant materials. The slag fibers were fabricated through a modified melt extraction method. The processing variables employed were the wheel speed and molten slag temperature. The synthesized fibers were characterized by optical microscope and scanning electron microscopy. It was found that the wheel speed of 1400 rpm generated better quality of mineral fibers in terms of the relative amount of shot, diameter and length. This was attributed to the relative extent of contact width between the flowing melt and the rotating wheel. The thickness of the slag fibers also were decreased with increasing the slag melt temperature due mainly to significant decrease in the viscosity of the slag melt. In addition, the lower melt temperature caused an increase in number of shots plus the mineral fibers.
Evaluation on Liquid Formability of Bulk Amorphous Alloys
Joo, Hye-Sook ; Kang, Bok-Hyun ; Kim, Ki-Young ;
Journal of Korea Foundry Society, volume 26, issue 5, 2006, Pages 227~231
Liquid formability of bulk amorphous alloys is known to be very poor due to their high viscosity comparing with conventional metallic materials. It is important to have the fabricating technology of bulk amorphous alloys in order to make the components with complicated shape. Liquid formability includes the mold cavity filling ability and the hot tear(crack) resistance during solidification. A mold made of a commercial tool steel for the formability test was designed. Melting was performed by the arc melting furnace with melting capacity of 200 g in an argon atmosphere. Liquid formability and glass forming ability of Cu base and Ni base bulk amorphous alloys were measured and evaluated. Mold filling ability of Ni-Zr-Ti-Si-Sn alloy was better than that of Cu-Ni-Zr-Ti alloy, however the reverse is the hot tear resistance. Bulk amorphous alloy is very susceptible to crack if partial crystallization occurs during solidification. Crack resistance was thought to be closely related with the glass forming ability.