On the origin of ultra-hardness in bearing steels: two-step bainite transformation processes
On the origin of ultra-hardness in bearing steels: two-step bainite transformation processes
Recent work has demonstrated that bearing steels, which display ultra-hardness and -strength, possess a complex multiscalar microstructure responsible for their properties. This includes blocky retained austenite at the micron level, bainite subunits, and marteniste plates/laths at the submicron level, as well as a complex dispersion of precipitates in the range of tens of nanometres. The harmonious combination of those features leads both to excellent mechanical and rolling contact fatigue properties. This work reviews the microstructure-property relationships associated to those microstructures, and puts them in the context of a novel two-step bainitic treatment, which was demonstrated to display the highest hardness amongst a number of bainitically hardened steels studied. The phase transformations developed throughout the heat treatment of such steels is discussed, and an interpretation of the origin of their exceptional properties is provided.
Bainite, Nanostructured materials, Two-step transformation, Ultra-strong
295-302
Rivera-Díaz-del-Castillo, P. E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
October 2012
Rivera-Díaz-del-Castillo, P. E.J.
6e0abc1c-2aee-4a18-badc-bac28e7831e2
Rivera-Díaz-del-Castillo, P. E.J.
(2012)
On the origin of ultra-hardness in bearing steels: two-step bainite transformation processes.
In AIST Steel Properties and Applications Conference Proceedings - Combined with MS and T'12, Materials Science and Technology 2012.
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Conference or Workshop Item
(Paper)
Abstract
Recent work has demonstrated that bearing steels, which display ultra-hardness and -strength, possess a complex multiscalar microstructure responsible for their properties. This includes blocky retained austenite at the micron level, bainite subunits, and marteniste plates/laths at the submicron level, as well as a complex dispersion of precipitates in the range of tens of nanometres. The harmonious combination of those features leads both to excellent mechanical and rolling contact fatigue properties. This work reviews the microstructure-property relationships associated to those microstructures, and puts them in the context of a novel two-step bainitic treatment, which was demonstrated to display the highest hardness amongst a number of bainitically hardened steels studied. The phase transformations developed throughout the heat treatment of such steels is discussed, and an interpretation of the origin of their exceptional properties is provided.
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Published date: October 2012
Venue - Dates:
2012 AIST Steel Properties and Applications Conference, Held in Conjunction with the Materials Science and Technology 2012 Conference and Exhibition, MS and T 2012, , Pittsburgh, PA, United States, 2012-10-07 - 2012-10-11
Keywords:
Bainite, Nanostructured materials, Two-step transformation, Ultra-strong
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Local EPrints ID: 492365
URI: http://eprints.soton.ac.uk/id/eprint/492365
PURE UUID: e3834ed1-fa8a-490a-8082-05bb10a7593d
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Date deposited: 25 Jul 2024 16:38
Last modified: 26 Jul 2024 02:09
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Author:
P. E.J. Rivera-Díaz-del-Castillo
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