Oxidation behavior of Fe-25Cr-20Ni-2.8Si during isothermal oxidation at 1,286 K; Life-time prediction

被引：72

作者：

Bauer, R. ^{[1
,2
]}

Baccalaro, M. ^{[3
,4
]}

Jeurgens, L. P. H. ^{[1
]}

Pohl, M. ^{[4
]}

Mittemeijer, E. J. ^{[1
,2
]}

机构：

[1] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

[2] Inst Phys Met, Stuttgart, Germany

[3] Robert Bosch GmbH, CR ARM, Stuttgart, Germany

[4] Ruhr Univ Bochum, Inst Mat & Mat Testing, Bochum, Germany

来源：

OXIDATION OF METALS | 2008年 / 69卷 / 3-4期

关键词：

breakaway oxidation; chemical failure; austenitic steels; depletion modeling; lifetime prediction;

D O I：

10.1007/s11085-008-9097-y

中图分类号：

TF [冶金工业];

学科分类号：

0806 [冶金工程];

摘要：

The oxidation behavior of an austenitic steel, type 1.4841, with a Cr content of 25 wt% and a high-Si content of 2.8 wt% was studied during isothermal oxidation at 1,286 K in air. A thick, crystalline Cr2O3 layer, on top of a much thinner, amorphous SiO2 layer, developed on the alloy substrate. After formation of a closed Cr2O3 scale, parabolic growth kinetics prevailed as long as the associated constant, steady-state Cr concentration in the alloy at the substrate/oxide interface of about 13 +/- 1 wt% was maintained. Upon prolonged oxidation, successive cracking and spallation of the thickening oxide scale eventually led to breakaway oxidation, because the "bulk-"Cr concentration in the interior of the alloy dropped below the critical value required to 'heal' the protective oxide layer after oxide spallation. Application of a lifetime prediction model of the alloy substrate under isothermal oxidation conditions allowed determination of the breakaway-oxidation time as a function of alloy-sheet thickness, by employing the Cr volume-diffusion coefficient in the alloy and the parabolic growth-rate constant, both determined in the present study by fitting calculated to experimental Cr-depletion profiles for various oxidation times.

引用

页码：265 / 285

页数：21

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