Decarburization of Fe-Cr-C steels during high-temperature oxidation

Journal Article · Wed Jun 01 00:00:00 EDT 1988 · Oxid. Met.; (United States)

DOI:https://doi.org/10.1007/BF00666843· OSTI ID:6053952

Hajduga, M; Kucera, J

Isothermal oxidation temperatures were carried out on Fe-Cr-C steels. The steels containing 0.08, 0.15, 0.17, 0.88, 1.51 and 12.77 wt.% Cr and 0.10, 0.49, 1.19, 0.18, 1.05, and 1.63 wt.% C were oxidized in ambient air at temperatures of 900, 1000, and 1200/degree/C. Steels containing 13.22, 12.90, 12.52, and 12.77 wt.% Cr and 0.15, 0.30, 0.50, and 1.63 wt.% C were heated (1100/degrees/C/3 hr) in a flowing atmosphere of O/sub 2/-N/sub 2/-He in a SETARAM thermobalance. Evidence of decarburization of the steels is given by metallographic observations, by direct measurements of carbon diffusivities from the decarburization profiles in the oxidized samples, and by the results of kinetics measurements. Carbon diffusion coefficients were measured by the standard sectioning method in the samples oxidized in air. A generalized equation for carbon diffusivity in Fe-Cr-C alloys is developed in terms of N/sub Cr/(wt.%),N/sub C/(wt.%), and T(K).

• Research Organization: Univ. of Katowice (Poland)
• OSTI ID: 6053952
• Journal Information: Oxid. Met.; (United States), Vol. 29:5-6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
THERMAL DIFFUSION
STEELS
OXIDATION
AIR
CHEMICAL REACTION KINETICS
CHROMIUM ALLOYS
CORROSIVE EFFECTS
DECARBURIZATION
HELIUM
METALLOGRAPHY
MICROSTRUCTURE
NITROGEN
OXYGEN
SCALING
TEMPERATURE EFFECTS
THERMAL DIFFUSIVITY
ALLOYS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DIFFUSION
ELEMENTS
FLUIDS
GASES
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
NONMETALS
PHYSICAL PROPERTIES
RARE GASES
REACTION KINETICS
THERMODYNAMIC PROPERTIES
360105* - Metals & Alloys- Corrosion & Erosion
360102 - Metals & Alloys- Structure & Phase Studies