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

Ichiro Seki, Kazuhiro Nagata

    Research output: Contribution to journalArticlepeer-review

    64 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

    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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