Affects of applied stresses on the isothermal and cyclic high-temperature oxidation behavior of superalloys

被引:46
作者
Barnard, B. R. [1 ]
Liaw, P. K. [1 ]
Buchanan, R. A. [1 ]
Klarstrom, D. L. [2 ]
机构
[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[2] Haynes Int Inc, Kokomo, IN 46904 USA
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 527卷 / 16-17期
基金
美国国家科学基金会;
关键词
Nickel-based superalloys; Oxidation; INTERNATIONAL WORKSHOP; ELEVATED-TEMPERATURES; ELECTRONIC RESISTANCE; ALLOYS SUPERALLOYS; KINETICS; NI-20CR; FOILS; DEFORMATION; MECHANISMS; CRACKING;
D O I
10.1016/j.msea.2010.03.050
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this investigation, the affect of applied tensile stresses on the isothermal and cyclic oxidation behavior of nickel-based superalloys was studied. The influence of applied stresses was investigated through measurements of specific mass change, oxide morphology and thickness, degree and depth of internal oxidation, and compositional changes in and around the oxide scales. It was determined that an applied tensile stress generally led to larger Cr/Ni ratios in the oxide scales, greater overall chromium depletion values directly under the oxide scales, lower specific mass change values, and thinner oxide scales. These affects are attributed to a greater concentration of dislocations, defects, etc. in the materials caused by the applied stress. These defects act as fast diffusion paths for the Cr atoms to diffuse to the surface, and thus, cause a reduction in the duration of the less protective transient oxidation period, and promote a faster formation of the protective Cr2O3 layer. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:3813 / 3821
页数:9
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