Journal of Japan Foundry Engineering Society
Online ISSN : 2185-5374
Print ISSN : 1342-0429
ISSN-L : 1342-0429
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Volume 72, Issue 8
Displaying 1-6 of 6 articles from this issue
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Research Article
  • Purification of Molten Non-combustible Magnesium Alloy
    Shigeru Akiyama, Hidetoshi Ueno, Michiru Sakamoto
    2000 Volume 72 Issue 8 Pages 521-524
    Published: August 25, 2000
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.72.521
    JOURNAL FREE ACCESS
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      The purification of molten noncombustible magnesium alloy was examined. After atmospheric melting, large amounts of inclusion suspended in the molten alloy were observed and identified as magnesium oxide by optical microscopy and X-ray analysis. It was difficult to remove these oxide inclusions from the molten alloy by a simple filtration technique using a stainless steel mesh, because the inclusions choked up the mesh. However, it was found that the oxide inclusions rose in the metal surface and could be removed simply from the molten metal, when the molten alloy was retained in a vacuum chamber. The content of the hydrogen gas dissolved within the molten metal remarkably decreased after the removal of the oxide inclusions. This vacuum process was effective for purifying the molten non-combustible magnesium alloy, significantly improving the tensile strength of purified alloy.
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  • Prediction of Solidification Behavior in AC8C Alloy by Thermodynamic Calculation
    Kenichi Ohsasa, Mayumi Shoji, Toshio Narita
    2000 Volume 72 Issue 8 Pages 525-529
    Published: August 25, 2000
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.72.525
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      The solidification behavior of an AC8C aluminum base multi-component alloy was investigated by means of thermal analysis and a quenching experiment. The solidification sequence of the aluminum base multi-component alloy was calculated by using the Thermo-Calc software, and the obtained results were compared with the experimental results. The calculated solidification sequence is as follows : Al rich fcc solid solution crystallizes as the primary phase, then followed by the precipitation of Si as the second, Fe13Al4 as the third, Mg2Al as the fourth phases and the solidification is completed by the L→fcc + Si + Fe13Al4 + Mg2Al + Al2Cu invariant eutectic reaction. The calculated solidification behavior of the alloy agreed well with the experimental result and demonstrates the efficiency of the thermodynamic calculation for predicting the solidification behavior of aluminum base multi-component alloys.
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  • Shrinkage Characteristics of Al-Si-Cu Ternary Alloys
    Hironori Ogura, Hirokazu Naka, Takanobu Suzuki, Mayuki Morinaka
    2000 Volume 72 Issue 8 Pages 530-534
    Published: August 25, 2000
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.72.530
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      In order to clarify the factors determining exterior shrinkage and interior shrinkage of Al-Si-Cu ternary alloys, investigations were carried out by a Tatur mold and shrinkage measurement. Findings are as follows. 1) Increasing the contents of silicon and copper reduced the liquidus surface. 2) Si < 4 %, the semisolid surface was decreased exponentially when silicon content was increased from zero to 4 %. 3) Si> 4 %, the semi-solid surface decreased slowly when copper content was increased from zero to 8 %. 4) The broader the semi-liquid temperature range of an alloy the larger was exterior shrinkage ratio of the alloy. 5) It can be concluded that the exterior shrinkage is determined by the semi-liquid temperature range, while the interior shrinkage is determined by the alloy contents and semi-liquid temperature range.
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  • Layer Formation of Deformed Spheroidal Graphite in Friction Welding of Spheroidal Graphite Cast Iron to Mild Steel
    Wenzhi Huang, Hiroshi Horie, Mitsuru Nakamura, Toshinori Kowata, Masay ...
    2000 Volume 72 Issue 8 Pages 535-540
    Published: August 25, 2000
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.72.535
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      Layer formation of deformed spheroidal graphite (LDSG) in the friction welding of spheroidal graphite cast iron (FCD) to mild steel (S20C) was examined. Friction welding was carried out under various welding conditions of friction pressure, friction time and rotational speed. The dimensions of the test piece were 15 mm in diameter and 70 mm in length.
      Micro and macroscopic observations and scanning electron microscopic observation were performed to clarify the formation of LDSG. The initial formation position, shape and weight of LDSG in the friction welding process were also examined.
      LDSG was formed away from the rotational center of the specimen at the initial stage of friction welding, and moved to the rotational center of the specimen during friction welding. The shape and weight of LDSG was dependent on the friction welding conditions. Appropriate welding conditions reduced the amount of LDSG in the joints of FCD and S20C.
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