Fabrication of lotus-type porous carbon steel by the continuous zone melting method and its mechanical properties |
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Authors: | Toshihiko Kujime Soong-Keun Hyun Hideo Nakajima |
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Affiliation: | (1) Graduate School of Engineering, Osaka University, 567-0047 Osaka, Japan;(2) Institute of Scientific and Industrial Research, Osaka University, 567-0047 Osaka, Japan |
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Abstract: | A lotus-type porous carbon steel with cylindrical pores was fabricated by the continuous zone melting method in a pressurized
mixture of hydrogen and helium gases. The porosity increases with increasing partial pressure of the hydrogen gas, while the
pore diameter remains almost constant, independent of the pressure. The ultimate tensile strength of the specimen with cylindrical
pores parallel to the tensile direction is lower than the estimated value, assuming that the strength is decreased in proportion
to the decrease of the cross-sectional area of the specimen, while the yield strength is higher than the estimated value.
The compressive yield strength is also higher than the estimated value. The increase in yield strength is considered to be
due to precipitation strengthening. The tensile strength is increased by quenching and tempering, while the elongation decreases.
Such mechanical properties are discussed in terms of the microstructural analysis. |
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