Analysis of oxidation kinetics in Xe-implanted AISI 446 steel

Journal Article · Sat Mar 31 23:00:00 EST 1990 · Scripta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-716X(90)90234-8· OSTI ID:5548660

Srinivasan, V ^[1]

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1. Universal Energy Systems, Inc., Dayton, OH (US)

Three stages of oxidation are exhibited by most metals and alloys when exposed to air or oxygen at high temperatures for a long enough time. These stages are transient, steady state and break-away oxidation. The transient oxidation has faster kinetics, and its extent depends on the test conditions and the (substrate) alloy composition. The oxides formed during the transient period are normally non-protective, such as NiO, Co- or Fe{sub 3}O{sub 4}/Fe{sub 2}O{sub 3} on Ni-, Co- and Fe-base alloys. The steady state scaling in many metals and complex alloys follows parabolic rate kinetics after the transient period, and is associated with the formation of protective oxides such as Cr{sub 2}O{sub 3} and Al{sub 2}O{sub 3}. Only a limited number of pure metals and alloys exhibit parabolic rate kinetics from the initiation of the oxidation reaction. Therefore, parabolic kinetics may be established in complex alloys at any time, t = t{sub p} during the transient period, where t{sub p} marks the time of initiation of parabolic rate kinetics and the measurable formation of protective scales in chromia of alumina formers. During the transient period, the weight gain measured at t {gt} t{sub p} is thus the sum of the weight of transient oxides and that of oxides which give rise to steady state parabolic rates. This paper reports on an attempt made to determine accurately the parabolic rate constant for Xe- implanted AISI 446 steel from the weight gain data and to show that the larger the weight gain during the transient stage, the longer is the exposure required to obtain an accurate estimate of the parabolic rate constant from the conventional kinetics plot between the square of the weight gain per unit area and the time.

• OSTI ID: 5548660
• Journal Information: Scripta Metallurgica; (United States), Journal Name: Scripta Metallurgica; (United States) Vol. 24:4; ISSN 0036-9748; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALLOYS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COBALT ALLOYS
COBALT BASE ALLOYS
COBALT COMPOUNDS
COBALT OXIDES
CORROSION
CORROSION PROTECTION
CRYSTAL STRUCTURE
ELEMENTS
FLUIDS
GASES
GRAIN SIZE
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
ION IMPLANTATION
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
MATERIALS
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
NICKEL COMPOUNDS
NICKEL OXIDES
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
RARE GASES
REACTION KINETICS
SIZE
STEELS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENT COMPOUNDS
XENON