On the role of surface deformation in the oxidation of NiCr alloys at 340-600 °C

被引:31
作者
Gheno, Thomas [1 ,2 ]
Desgranges, Clara [1 ,3 ]
Martinelli, Laure [1 ]
机构
[1] Univ Paris Saclay, CEA, DEN SCCME CEA, F-91191 Gif Sur Yvette, France
[2] Univ Paris Saclay, ONERA, DMAS, F-92322 Chatillon, France
[3] Safran Tech, Rue Jeunes Bois, F-78772 Magny Les Hameaux, France
关键词
Ni-based alloys; Cold work; Selective oxidation; Diffusion; Dislocations; Grain boundaries; HIGH-TEMPERATURE; COLD WORK; VACANCY CONDENSATION; STAINLESS-STEEL; SELF-DIFFUSION; BEHAVIOR; RESISTANCE; CORROSION; WATER; FE;
D O I
10.1016/j.corsci.2020.108805
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of surface deformation on selective oxidation is studied on a Ni-30Cr alloy prepared by grinding (SiC paper) vs. polishing (diamond suspensions), and oxidized in air at 340-600 degrees C. Imaging and subsurface composition profiling by transmission electron microscopy are combined to investigate the relationships between microstructure, diffusion and oxidation. The depth of deformed material is found to be critical to selective oxidation. Atypical Cr depletion profiles reflect an abrupt change in diffusion properties between the severely deformed subsurface and the bulk. The relative contributions of grain boundary, dislocation and bulk diffusion to the Cr flux are examined based on short-circuit diffusion theory.
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页数:14
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