On the origin of ultra-hardness in bearing steels:Two-step bainite transformation processes

Rivera-Díaz-del-Castillo, P. E J (2012) On the origin of ultra-hardness in bearing steels:Two-step bainite transformation processes. In: Materials Science and Technology Conference and Exhibition 2012, MS and T 2012. UNSPECIFIED, USA, pp. 1094-1101. ISBN 9781622766536

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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.

Item Type:
Contribution in Book/Report/Proceedings
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2500/2501
Subjects:
ID Code:
125544
Deposited By:
Deposited On:
25 May 2018 12:32
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 10:49