Lattice constant of iron and austenite including its supersaturation phase of carbon

Ichiro Seki, Kazuhiro Nagata

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)

Abstract

Electrolytic iron powder was heated into γ-iron phase and carburized in austenite and its supersaturation phase under the gas mixture of CO and CO2 with carbon activity of 0.1 to 1.0. The spacing of lattice planes of iron was measured using a high temperature X-ray diffractometry (XRD), which gradually increased with time and arrived at a constant value. The carbon concentration in samples after experiment was measured by a combustion-infrared absorptiometry. The lattice constants, a0 (nm), of α-iron, γ-iron and austenite including its supersaturation phase of carbon have been determined as follows; α-iron: a0=1.602×10 -9T2+2.059×10-6T+0.2860 (295 to 1 183 K) γ-iron: a0=8.1593×10-6T+0.35519 (1 183 to 1 550 K) Austenite: a0=0.35519+8.1593×10-6T+1. 7341×10-3C (0 to 3.35 masss% and 1 452 to 1 550 K) where T and C are temperature (K) and carbon concentration (mass%), respectively.

Original languageEnglish
Pages (from-to)1789-1794
Number of pages6
JournalIsij International
Volume45
Issue number12
DOIs
Publication statusPublished - 2005
Externally publishedYes

Keywords

  • Austenite
  • High temperature X-ray diffractometry
  • Lattice parameter
  • Supersaturation
  • α-iron
  • γ-iron

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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