Enhanced internal oxidation as trigger for breakaway oxidation of Fe-Cr alloys in gases containing water vapor

被引：148

作者：

Essuman, E.

Meier, G. H.

Zurek, J. ^{[1
]}

Haensel, M.

Singheiser, L.

Quadakkers, W. J.

机构：

[1] Forschungszentrum Julich, IEF 2, D-52428 Julich, Germany

[2] Univ Pittsburgh, Pittsburgh, PA USA

来源：

SCRIPTA MATERIALIA | 2007年 / 57卷 / 09期

关键词：

chromia; iron alloys; hydrogen; oxidation;

D O I：

10.1016/j.scriptamat.2007.06.058

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Binary Fe-Cr alloys were studied with respect to isothermal oxidation behavior at 900 degrees C in Ar-O-2, Ar-H2O and Ar-H-2-H2O gas mixtures. Chromium in solution exhibits a higher tendency to become internally oxidized in the gases containing water vapor than in the Ar-O-2 gas because of hydrogen dissolution in the alloy. This mechanism explains why Fe-Cr alloys with intermediate Cr contents (e.g., 10-20 wt.%) exhibit protective chromia-rich scale formation in dry gases but tend to form breakaway-type Fe-rich oxides in wet gases. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：845 / 848

页数：4

共 19 条

[11] Effect of water vapour on growth and adherence of chromia scales formed on Cr in high and low PO2-environments at 1000 and 1050°C [J].