Influence of a reactive element on the growth of a thermally grown chromia scale: A grazing emission X-ray fluorescence study

Influence of a reactive element on the growth of a thermally grown chromia scale: A grazing emission X-ray fluorescence study

The oxidation of 55Fe-25Cr-20Ni (wt.%) alloys, with and without added reactive element (RE) Y, were studied using grazing-emission X-ray fluorescence (GEXRF). Samples were studied after isothermal treatments at 750 deg C in 02 and after cyclic-oxidation treatments. In early-stage oxidation, a Nirich...

Full description

Saved in:
Bibliographic Details
Published in:Oxidation of metals Vol. 59; no. 5-6; pp. 469 - 481
Main Authors: KOSHELEV, I. K, PAULIKAS, A. P, URAN, S, BENO, M. B, JENNINGS, G, LINTON, J, VEAL, B. W
Format: Journal Article
Language:English
Published: Heidelberg Springer 01-06-2003
Subjects:
ALLOYS
Applied sciences
Corrosion
Corrosion tests
DISTRIBUTION
Exact sciences and technology
FLUORESCENCE
MATERIALS SCIENCE
Metals. Metallurgy
OXIDATION
Ternary alloy
Oxidation test
Property composition relationship
Oxide layer
X ray fluorescence
Yttrium addition
Hot corrosion
Experimental study
Oxide scale
Chromium oxide
Chromium alloy
Oxidation
Nickel alloy
Iron base alloys
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The oxidation of 55Fe-25Cr-20Ni (wt.%) alloys, with and without added reactive element (RE) Y, were studied using grazing-emission X-ray fluorescence (GEXRF). Samples were studied after isothermal treatments at 750 deg C in 02 and after cyclic-oxidation treatments. In early-stage oxidation, a Nirich scale is formed. The distribution of this early-stage Ni deposit is studied as the scale evolves. The Ni deposit, serving as a marker, remains on the outer scale surface in Y-containing alloys, but is not detectable in scales on Y-free alloys. The results indicate that new chromia scale growth occurs at the outer surface in Y -free alloys but, for Y-containing alloys, new growth occurs away from the outer surface. Thus, a shift in the growth mode is apparently observed at 750 deg C, consistent with higher-temperature observations. However, unlike the high-temperature measurements, scale-growth rates are not significantly affected by the RE.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ANL/MSD/JA-39755
USDOE Office of Science (SC)
DE-AC02-06CH11357
ISSN:0030-770X
1573-4889
DOI:10.1023/A:1023615121997