Journal of Japan Foundry Engineering Society
Online ISSN : 2185-5374
Print ISSN : 1342-0429
ISSN-L : 1342-0429
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Volume 73, Issue 1
Displaying 1-28 of 28 articles from this issue
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Research Article
  • High Temperature Oxidation of High Chromium White Cast Iron
    Noboru Miyakawa, Kozo Wakasugi, Mikio Nomura, Michiru Sakamoto, Keisak ...
    2001 Volume 73 Issue 1 Pages 3-8
    Published: January 25, 2001
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.73.3
    JOURNAL FREE ACCESS
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      Atmospheric high temperature oxidation behavior was studied on high chromium cast iron containing 2.2 to 4.1 % C and 19 to 26 % Cr at 953 to 1223 K. Though the Cr content of the matrix in 25 % chromium cast iron was fairly lower than that of stainless steel, the former exhibited a better oxidation resistance than the latter. Cr rich primary and eutectic M7C3, and also secondary carbide suppressed the progress of the oxidation of matrix. 25 % Cr eutectic specimens, composed of fine (matrix + M7C3) eutectic structures, showed the highest oxidation resistance. A protective continuous oxide layer of Cr2O3 was formed on the 25 % Cr specimens, while the oxide layer on the 20 % Cr specimens consisted mostly of Fe2O3.
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  • Influences of Matrix Structure on Notch Effects in Tensile and Fatigue Characteristics of Spheroidal Graphite Cast Iron
    Minoru Hatate, Toshio Shiota, Naoki Takahashi
    2001 Volume 73 Issue 1 Pages 9-13
    Published: January 25, 2001
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.73.9
    JOURNAL FREE ACCESS
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      The influences of the matrix structure on the notch effect in tensile and rotating-bending fatigue characteristics were investigated by using four kinds of spheroidal graphite (SG) cast iron samples whose matrix structures are ferritic, pearlitic, upper bainitic and lower bainitic. While the stress concentration factor (α) was smaller than 2.3, the tensile strength of notched specimens was larger than that of smooth specimens regardless of the matrix structure. This is considered to be due to the plastic constraint effect caused by triaxial stress. All the samples showed that a notched specimen with a larger α resulted in a smaller in fatigue strength than a smooth specimen in all the α ranges examined. A larger decrement in the fatigue strength of a specimen with a larger α is considered mainly due to an earlier occurrence of cracks. The notch effect in the tensile and fatigue strength of SG iron is affected largely by its matrix structure.
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