The air oxidation of an austenitic Fe-Mn-Cr stainless steel for fusion-reactor applications

Journal Article · Tue Apr 01 04:00:00 EST 1986 · Oxid. Met.; (United States)

DOI:https://doi.org/10.1007/BF00655899· OSTI ID:5185850

Douglass, D L; Asmundis, C; Gesmundo, F

The oxidation in air of an austenitic Fe-Mn-Cr steel containing 17.8 Mn, 9.5 Cr, 1.0 Ni, 0.27 C, and 0.03 N was studied over the range 700-1000/sup 0/C. Oxidation of surface-abraded samples at ''low'' temperatures 700-750/sup 0/C, resulted in only Mn/sub 2/O/sub 3/ containing dissolved chromium, except at corners, where large nodules containing spinel and mangano-wustite was formed. The Mn/sub 2/O/sub 3/ layer grew into the substrate forming a globular-type film. No internal oxidation was observed beneath the Mn/sub 2/O/sub 3/ film at either 700 or 750/sup 0/C. Samples oxidized in the ''high temperature'' region of 800-1000/sup 0/C exhibited vastly different behavior, forming thick stratified scales at long times (24 hour), the scales consisting of a very thin outer layer of Mn/sub 2/O/sub 3/, Fe-Mn spinel beneath the outer layer, and a thick layer of mangano-wustite and a chromium-containing spinel. No chromium was found in the outer two layers. A thin layer of nearly pure Fe/sub 2/O/sub 3/ formed between Mn/sub 2/O/sub 3/ and the outer spinel. Quasiparabolic kinetics were observed. A model for the breakdown of protective films is proposed which involves internal oxidation.

• Research Organization: Univ. of California, Los Angeles, CA
• OSTI ID: 5185850
• Journal Information: Oxid. Met.; (United States), Journal Name: Oxid. Met.; (United States) Vol. 25:3; ISSN OXMEA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
AIR
ALLOYS
AUSTENITIC STEELS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COHERENT SCATTERING
CORROSION PRODUCTS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DIFFRACTION
ELECTRON MICROSCOPY
FLUIDS
GASES
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
MANGANESE COMPOUNDS
MANGANESE OXIDES
MATERIALS
MATERIALS TESTING
MICROSCOPY
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PASSIVATION
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
REACTION KINETICS
SCALING
SCANNING ELECTRON MICROSCOPY
SCATTERING
STAINLESS STEELS
STEELS
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
TESTING
THERMONUCLEAR REACTOR MATERIALS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION