期刊
MATERIALS CHARACTERIZATION
卷 123, 期 -, 页码 349-353出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.12.002
关键词
Severe plastic deformation; Grain boundary segregation; Carbide dissolution; Nanocrystalline structure; Rolling contact fatigue
类别
资金
- German Federal Ministry of Education and Research (BMBF) [03SF0535]
Atom probe tomography was employed to characterize the microstructure and C distribution in the white etching area (WEA) of a martensitic 100Cr6 bearing steel subjected to rolling contact fatigue. Different from its surrounding matrix where a plate-like martensitic structure prevails, the WEA exhibits equiaxed grains with a uniform grain size of about 10 nm. Significant C grain boundary enrichment (>7.5at.%) and an overall higher C concentration than the nominal value are observed in the WEA. These results suggest that the formation of WEA results from severe local plastic deformation that causes dissolution of carbides and the redistribution of C. (C) 2016 Elsevier Inc. All rights reserved.
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