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

Ichiro Seki; Kazuhiro Nagata

doi:10.2355/isijinternational.45.1789

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

Ichiro Seki, Kazuhiro Nagata

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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 language	English
Pages (from-to)	1789-1794
Number of pages	6
Journal	Isij International
Volume	45
Issue number	12
DOIs	https://doi.org/10.2355/isijinternational.45.1789
Publication status	Published - 2005
Externally published	Yes

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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10.2355/isijinternational.45.1789

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title = "Lattice constant of iron and austenite including its supersaturation phase of carbon",

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.",

keywords = "Austenite, High temperature X-ray diffractometry, Lattice parameter, Supersaturation, α-iron, γ-iron",

author = "Ichiro Seki and Kazuhiro Nagata",

year = "2005",

doi = "10.2355/isijinternational.45.1789",

language = "English",

volume = "45",

pages = "1789--1794",

journal = "Transactions of the Iron and Steel Institute of Japan",

issn = "0915-1559",

publisher = "Iron and Steel Institute of Japan",

number = "12",

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TY - JOUR

T1 - Lattice constant of iron and austenite including its supersaturation phase of carbon

AU - Seki, Ichiro

AU - Nagata, Kazuhiro

PY - 2005

Y1 - 2005

N2 - 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.

AB - 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.

KW - Austenite

KW - High temperature X-ray diffractometry

KW - Lattice parameter

KW - Supersaturation

KW - α-iron

KW - γ-iron

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

Abstract

Keywords

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