Fabrication of lotus-type porous carbon steel slabs by continuous casting technique in nitrogen atmosphere

Makoto Kashihara, Shinsuke Suzuki, Yuki Kawamura, Sang Youl Kim, Hiroshi Yonetani, Hideo Nakajima

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Lotus-type porous carbon steel slabs with long cylindrical pores aligned in one direction were fabricated by the continuous casting technique in a mixture gas of N2 0.8 MPa and Ar 1.7 MPa or in N2 2.5 MPa at various transfer velocities from 2.5 mm•min-1 to 20 mm•min-1. The pore size in lotus carbon steel fabricated in the mixture gas of nitrogen and argon was small and homogeneous, whereas the pore size in nitrogen had bimodal distribution depending on the transfer velocity. The large pores were observed mainly at the edge of the slab, which are considered to be merged of several inclined pores. The porosity depended on nitrogen partial pressure, which is explained by Sieverts' law. The hardness of lotus carbon steel matrix increased, which was attributed to the solid-solution of nitrogen.

Original languageEnglish
Pages (from-to)2377-2382
Number of pages6
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume41
Issue number9
DOIs
Publication statusPublished - 2010 Sep 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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