Effect of alloy grain size and silicon content on the oxidation of austenitic Fe-Cr-Ni-Mn-Si alloys in pure O sub 2
- Massachusetts Inst. of Tech., Cambridge (United States)
Austenitic Fe-18Cr-20Ni-1.5 Mn alloys containing 0, 0.6, and 1.5 wt% Si were produced both by conventional and rapid solidification processing. The isothermal and cyclic oxidation resistance of the alloys were studied at 900C in pure O{sub 2} to elucidate the role of alloy microstructure and Si content on oxidation properties. The conventionally-processes, large-grained alloy that contained no silicon formed Fe-rich nodules during oxidation. The nodule formation was effectively eliminated by either reducing the alloy grain size by rapid solidification or by adding Si to the alloy. The lowest weight grains were achieved when a continuous silica layer formed between the alloy and the external chromia scale. The formation of the continuous silica layer required a combination of fine alloy grain size and high Si content. The presence of S in the alloy was found to be detrimental to oxide scale adherence when the silica layer was continuous.
- OSTI ID:
- 5345028
- Journal Information:
- Oxidation of Metals; (United States), Vol. 36:3-4; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM ALLOYS
GRAIN SIZE
OXIDATION
IRON BASE ALLOYS
MANGANESE ALLOYS
NICKEL ALLOYS
SILICON
METALLURGICAL EFFECTS
CHEMICAL COMPOSITION
CHROMIUM OXIDES
EXPERIMENTAL DATA
FRAGMENTATION
MICROSTRUCTURE
OPTICAL MICROSCOPY
PROTECTIVE COATINGS
SCANNING ELECTRON MICROSCOPY
SILICA
SILICON ADDITIONS
SOLIDIFICATION
SULFUR
TEMPERATURE RANGE 1000-4000 K
TRANSMISSION ELECTRON MICROSCOPY
WEIGHT MEASUREMENT
X-RAY DIFFRACTION
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
COATINGS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
INFORMATION
IRON ALLOYS
MICROSCOPY
MINERALS
NONMETALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SCATTERING
SEMIMETALS
SILICON ALLOYS
SILICON COMPOUNDS
SILICON OXIDES
SIZE
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
360105* - Metals & Alloys- Corrosion & Erosion
360102 - Metals & Alloys- Structure & Phase Studies