Fabrication of lotus-type porous carbon steel via continuous zone melting and its mechanical properties |
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Authors: | M Kashihara H Yonetani T Kobi SK Hyun S Suzuki H Nakajima |
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Affiliation: | aMori Seiki Co. Ltd., 201, MIDAI, Iga, Mie 519-1414, Japan;bThe Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan |
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Abstract: | Lotus-type porous carbon steel (lotus carbon steel) AISI1018 rods with long cylindrical pores aligned in one direction were fabricated using the continuous zone melting technique under nitrogen gas pressure of 2.5 MPa. The porosity decreased with increasing transference velocities of 40–160 μm s−1. Tensile tests of the fabricated lotus-type carbon steel rods were performed. The elongation of lotus carbon steel increased after normalizing at 1200 K. The tensile strength and the Young's modulus decreased with increasing porosity. In contrast, the yield strength of lotus carbon steel did not decrease, even with a porosity of 20%, compared with that of non-porous carbon steel. This superior characteristic is attributed to solid-solution strengthening by solute nitrogen. |
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Keywords: | Lotus-type porous carbon steel Nitrogen Porous metals Porosity Continuous zone melting Tensile strength Yield strength Young's modulus Solid-solution hardening |
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