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Nanoindentation Analysis of Evolved Bearing Steel under Rolling Contact Fatigue (RCF).

Abdullah, M.U., Khan, Z. A. and Kruhoeffer, W., 2020. Nanoindentation Analysis of Evolved Bearing Steel under Rolling Contact Fatigue (RCF). In: 2020 STLE Tribology Frontier Virtual Conference, 9-13 November 2020, USA (Virtual), 22 - 23.

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Abstract

The bearing material operated under RCF is subjected to the triaxial stress state where work hardening followed by softening has been reported under the contact track. Such nonconformities (hardening/softening along with microstructural alterations) create complexities to model the cyclic hardening of bearing material under RCF. Current study presents a semi-empirical approach to evaluate the evolved subsurface response of bearing material with the help of a three-faced pyramidal Berkovich nanoindenter employing expanding cavity model for strain hardening materials. The expanding cavity model converts the localized measured hardness change to flow stresses which have been evolved during strain-hardening and microstructural phase changes of the bearing material. Moreover, to evaluate the representative stress-strain curve of the altered microstructure, a 5um spherical indenter was employed in a cyclic loading manner. The use of the spherical indenter with the integration of Field and Swain numerical model enables to extract the representative flow curve of the material at highly localized areas which cannot be possible even with miniature uniaxial tension/compression test.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Nanoindentation Analysis ; Evolved Bearing Steel ; Rolling Contact Fatigue ; Microstructural alterations ; Bearing material ; Numerical model
Group:Faculty of Science & Technology
ID Code:34808
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:16 Nov 2020 09:38
Last Modified:16 Nov 2020 09:38

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