Mechanisms of carburization and melting of iron by CO gas

研究成果: Article査読

17 被引用数 (Scopus)


Mechanisms of carburizing and melting iron in CO atmosphere with carbon activity of unity have been studied at a temperature range of 1 486-1 664 K, i.e. above the eutectic temperature of the Fe-C system. The behavior of melting iron was observed in situ by a confocal scanning laser microscope incorporated with an infrared image furnace. Carburization to γ-iron is controlled by the mixed rate-determining step, which consists of the carbon diffusion in γ-iron and chemical reaction at the gas-solid interface. The diffusion coefficient of carbon in γ-iron was determined from the carbon concentration profiles as follows, D/m2s-1=2.0×10-6 exp(-112.0×103/RT) (1 486-1 664 K) where R is the gas constant, 8.314 JK-1 mol-1. The mechanism of iron melting by carburization is discussed according to the analogous treatment to the heterogeneous nucleation theory. An incubation time is necessary for melting iron, where the in cubation time is the time required for the carbon concentration to reach the supersaturated concentration from the solidus concentration of carbon.

ジャーナルIsij International
出版ステータスPublished - 2001

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学


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