OXIDATION OF HIGH-CHROMIUM NI-CR ALLOYS

被引:69
作者
ECER, GM [1 ]
MEIER, GH [1 ]
机构
[1] UNIV PITTSBURGH,DEPT MET & MAT ENGN,PITTSBURGH,PA 15260
来源
OXIDATION OF METALS | 1979年 / 13卷 / 02期
关键词
high temperature; kinetics; mechanisms; nickel-chromium alloys; oxidation;
D O I
10.1007/BF00611976
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The oxidation of binary Ni-Cr alloys containing 44 and 50 wt. % Cr has been studied over a range of oxygen partial pressures at temperatures between 800 and 1100°C. The effects of cold work, surface preparation, and distribution of the Cr-rich second phase have been studied. The oxidation behavior is complex and cannot be described by a single model. The oxide grows by short-circuit diffusion as well as bulk transport through Cr2O3scales. The scale-growth mechanism includes extensive metal-oxide separation requiring Cr vapor transport to the scale, compressive stresses within the oxide which result in scale bulging and cracking, and the formation of a second oxide layer which results in voids being incorporated into the scale. Any factor which reduces the oxide grain size, such as cold work, finer distribution of the Cr-rich α phase or reduced oxygen pressure, results in an increased oxidation rate of binary alloys because of an increased number of grain-boundary short-circuit diffusion paths. © 1979 Plenum Publishing Corporation.
引用
收藏
页码:119 / 158
页数:40
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