《The oxidation of iron-aluminum alloys》.pdf
文本预览下载声明
Oxidation of Metals, Vol. 38, Nos. 1/2, 1992
The Oxidation of Iron-Aluminum Alloys
R. Prescott* and M. J. Graham*
Received June 1, 1991
Thispaper briefly summarizes studies related to the oxidation of Fe-Al alloys.
Emphasis isplaced on oxide phase composition, morphology, and the develop-
ment ofprotective c~-A1203scales on oxidation-resistant Fe-Al alloys both with
and without ternary additions.
KEY WORDS: Fe-A1 alloys; oxidation; scale morphology; ternary additions.
I N T R O D U C T I O N
In order to develop an understanding of the mechanisms involved in the
oxidation of alumina-forming alloys, it is reasonable to begin by examining
the binary Fe-A1 system. Fe-A1 alloys have been of interest since the early
1930% when it was realized that additions of A1 led to improvements in the
scaling resistance of iron and steels. Hauttman I reported that the heat
resistance of steels at 1000~ improved markedly when the A1 content was
raised to between 4-9%. Ziegler 2 noted an improvement in performance
with increasing A1 content in studies on Fe-A1-C alloys and claimed that
alloys with 8% A1 were comparable in oxidation resistance to Ni-Cr alloys.
Other workers also noted that addition of A1 brought about improved scaling
properties in the range 900-1200~ 3 and it was observed that oxidation took
place in accordance with a parabolic rate law. 4 Sykes and Bampfylde 5
concluded that the percentage of A1 required to give complete protection
is dependent on temperature, with 6% A1 being sufficient at 900-1000~
9% is necessary at ll00~ and 11% at 1300~
*Institute for Mi
显示全部