Subsurface Depletion and Enrichment Processes During Oxidation of a High Chromium, Laves-Phase Strengthened Ferritic Steel

被引：20
作者：
Asensio, C. [1 ]
Chyrkin, A. [1 ]
Niewolak, L. [1 ]
Konoval, V. [2 ]
Hattendorf, H. [3 ]
Kuhn, B. [1 ]
Singheiser, L. [1 ]
Quadakkers, W. J. [1 ]
机构：
[1] Forschungszentrum Julich GmbH, Inst Energy & Climate Res IEK 2, D-52425 Julich, Germany
[2] NASU, Inst Problems Mat Sci, UA-03680 Kiev, Ukraine
[3] ThyssenKrupp VDM, D-58791 Werdohl, Germany
来源：
ELECTROCHEMICAL AND SOLID STATE LETTERS | 2011年 / 14卷 / 08期
关键词：
diffusion; oxidation; phase equilibrium; precipitation hardening; steel; ALLOY; CREEP; TRANSFORMATIONS; SCALES;
D O I：
10.1149/1.3590258
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
During oxidation of a Laves-phase strengthened ferritic steel at 800 degrees C in Ar/H-2/H2O a precipitate-depleted zone occurs as a result of subscale chromium depletion. In parallel, an enrichment of Laves-phase is found in the immediate vicinity of the scale/alloy interface. Modeling the phase equilibria and diffusion processes for an Fe-Cr-Nb model alloy using Thermo-Calc and DICTRA revealed that this combined enrichment/depletion process can be explained by the influence of alloy chromium concentration on the Nb activity. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3590258] All rights reserved.
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收藏
页码：P17 / P20
页数：4
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