Journal of the Japan Society of Powder and Powder Metallurgy
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
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Volume 69, Issue 6
June
Displaying 1-11 of 11 articles from this issue
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Paper
  • Analysis of Liquid Phase Sintering of Metal-Glass Mixed Powder by Experiment and Computer Simulation
    Hiroyuki TANAKA, Hideaki MATSUBARA, Hideaki YOKOTA, Toshihiro IGUCHI, ...
    2022 Volume 69 Issue 6 Pages 239-248
    Published: June 15, 2022
    Released on J-STAGE: June 15, 2022
    DOIhttps://doi.org/10.2497/jjspm.69.239
    JOURNAL OPEN ACCESS
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    Liquid phase sintering behavior of metal-glass system is experimentally and numerically analyzed. From the experimental observation, glass wets metal surfaces and assists the metal particles rearrangement, which is very important for annihilating pores. From the experiment, the amount of glass influences not only on the porosity but also on the grain growth behavior significantly. The sintering behavior is well reproduced by computational study by using Monte Carlo method with experimentally obtained surface energies of metal-glass system. The numerical study suggests that the frequency factor of Ostwald should be smaller than that of solid grain growth in this metal-glass powder system. Finally, this study suggests that spatial distribution is very important for grain growth. Although glass prevents the metal particle contact, the glass assists the metal particles rearrangement that contributes to metal grain growth.

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  • Experiment and DEM Simulation on Bending Fracture of Ultra-fine Grained Cemented Carbide
    Hiromu KATO, Hideaki MATSUBARA, Sota TERASAKA, Masayuki TAKADA, Masano ...
    2022 Volume 69 Issue 6 Pages 249-256
    Published: June 15, 2022
    Released on J-STAGE: June 15, 2022
    DOIhttps://doi.org/10.2497/jjspm.69.249
    JOURNAL OPEN ACCESS
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    The fracture of WC-Co cemented carbides with different WC particle sizes was investigated experimentally, and then a discrete element method (DEM) simulation was performed considering such experiments. The bending strength of ultra-fine grained cemented carbide with a WC particle size of 0.4 μm was extremely high. The ultra-fine grained cemented carbide sample after bending test had numerous fracture pieces and the short length of the specimens without fracture. Initial structures consisting of matrix and defect (d) particles were used in the DEM simulations. The DEM simulation results for a sample of 2% d particle, which was considered ultra-fine grained cemented carbide by comparison with experimental results, were as follows: The sample with the highest load at fracture, the most d particle bond-breaking, and the shortest length of remaining specimen without particle bond breaking was the 2% d sample. The DEM simulation was considered to be very useful in understanding the ultra-fine grained cemented carbide’s strength and fracture behavior.

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    Editor's pick

    2022 JSPM Distinguished Paper Award

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