Carbide dissolution in bearing steels
Carbide dissolution in bearing steels
The conditions leading to precipitate dissolution in a variety of bearing steels are studied. Computational thermodynamics and kinetics are employed to determine the microstructural effects leading to precipitate instability, and further dissolution. It is found that there exists a characteristic threshold value of the driving force that induces dissolution and that carbon migration from cementite towards the dislocation strain fields can play a dominant role. Microstructures not fully precipitated and far from their equilibrium volume fraction appear to be much more stable than their fully developed counterparts. An explanation to the occurrence of lenticular carbides engulfing white etching bands and areas is provided. It is discussed how dislocation development and migration in the neighbourhood of ferrite/carbide interfaces control carbide dissolution.
Bearing steels, Carbide dissolution, Cementite decomposition, Rolling contact fatigue, Severe plastic deformation
364-372
Kang, J.-H.
20c8628b-58fc-473d-b1e5-067f988b8bd0
Rivera-Díaz-Del-Castillo, P.E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
February 2013
Kang, J.-H.
20c8628b-58fc-473d-b1e5-067f988b8bd0
Rivera-Díaz-Del-Castillo, P.E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
Abstract
The conditions leading to precipitate dissolution in a variety of bearing steels are studied. Computational thermodynamics and kinetics are employed to determine the microstructural effects leading to precipitate instability, and further dissolution. It is found that there exists a characteristic threshold value of the driving force that induces dissolution and that carbon migration from cementite towards the dislocation strain fields can play a dominant role. Microstructures not fully precipitated and far from their equilibrium volume fraction appear to be much more stable than their fully developed counterparts. An explanation to the occurrence of lenticular carbides engulfing white etching bands and areas is provided. It is discussed how dislocation development and migration in the neighbourhood of ferrite/carbide interfaces control carbide dissolution.
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More information
Accepted/In Press date: 10 September 2012
e-pub ahead of print date: 27 October 2012
Published date: February 2013
Keywords:
Bearing steels, Carbide dissolution, Cementite decomposition, Rolling contact fatigue, Severe plastic deformation
Identifiers
Local EPrints ID: 492477
URI: http://eprints.soton.ac.uk/id/eprint/492477
ISSN: 0927-0256
PURE UUID: da263409-1ca9-41b8-87bf-6a8d396e5fe0
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Date deposited: 29 Jul 2024 16:59
Last modified: 30 Jul 2024 02:06
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Author:
J.-H. Kang
Author:
P.E.J. Rivera-Díaz-Del-Castillo
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