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Fe-5 mass%Al合金の1073 Kにおける内部酸化・窒化挙動

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J. Jpn Inst. Met. Mater. 63(10) 1311.pdf1.17 MBPDFView/Open
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Title: Fe-5 mass%Al合金の1073 Kにおける内部酸化・窒化挙動
Other Titles: Internal Oxidation and Nitridation Behavior of an Fe-5 mass%Al Alloy at 1073 K
Authors: 林, 重成1 Browse this author →KAKEN DB
成田, 敏夫2 Browse this author
Authors(alt): Hayashi, Shigenari1
Narita, Toshio2
Keywords: iron-aluminum alloy
internal oxidation
internal nitridation
precipitate free zone
corrosion rate
mophology of internal precipitates
Issue Date: Oct-1999
Publisher: 日本金属学会
Journal Title: 日本金属学会誌
Journal Title(alt): Journal of the Japan Institute of Metals
Volume: 63
Issue: 10
Start Page: 1311
End Page: 1316
Publisher DOI: 10.2320/jinstmet1952.63.10_1311
Abstract: The internal oxidation and nitridation behavior of an Fe-5 mass%Al alloy was investigated at 1073 K in oxygen, nitrogen-20 vol%oxygen(mix), and air atmospheres for up to 57.6 ks using thermo-gravimetry, scanning electron microscope, electron probe micro analyzer, and X-ray diffraction analysis. The time dependence of the amount of oxidation showed very high oxidation rate at the initial stage, a transient stage with a rapid rate decrease, and then steady state oxidation. The critical times between the transient and steady states were 900 s in air, and 2 ks in both the mix and in O2. In the “steady state” condition, the oxidation rate in O2 was very slow, while it was relatively faster in the mix and in air. In O2, both a thin duplex (Fe2O3 and Al2O3) and a thick triplex (Fe2O3, Fe3O4, and FeAl2O4) scales formed and the film-like internal oxides grew beneath the thick triplex scale. In the mix and in air a thick scale formed with a triplex structure of Fe2O3, Fe3O4, and FeAl2O4 accompanied by an internal oxidation of duplex FeAl2O4 and Al2O3 zones, which grew perpendicularly to an alloy/scale interface, and spike-like AlN precipitates formed beneath the internal oxidation zone. Further, film-like Al2O3 formed locally at the top of internal AlN precipitates. A precipitate free zone (PFZ) formed between the internal oxidation and nitridation zone, and a formation mechanism for the PFZ was proposed.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 林 重成

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