Fabrication of lotus-type porous carbon steel via continuous zone melting and its mechanical properties

M. Kashihara*, H. Yonetani, T. Kobi, S. K. Hyun, S. Suzuki, H. Nakajima

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)112-118
Number of pages7
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Issue number1-2
Publication statusPublished - 2009 Oct 25
Externally publishedYes


  • Continuous zone melting
  • Lotus-type porous carbon steel
  • Nitrogen
  • Porosity
  • Porous metals
  • Solid-solution hardening
  • Tensile strength
  • Yield strength
  • Young's modulus

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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