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Damage Mechanisms of Initiating Micro-Pitting on 42CrMo4 Hardened and Tempered Steel

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Abstract:

A deep comprehension of the damage mechanisms involved in contact fatigue should optimize material and heat treatment choice for a specific application. In this work rolling disc-on-disc contact fatigue tests have been performed on a hardened and tempered UNI EN 42CrMo4 . The adopted test method creates the best conditions in order to develop micro-pitting on disc surface. Extensive micro-fractographic examinations have been carried out, on the damaged surfaces, through a scanning electronic microscope (SEM). For this steel, loaded with Hertzian pressure of 1000 MPa, the failure mode is always micro-pitting which begins at the surface, and it is not a sub-superficial damaging. If micro-pits develop, they will coalesce in larger craters. By this way, the probability that micropitting will degenerate into sub-superficial destructive pitting is very high.

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Info:

Periodical:

Key Engineering Materials (Volumes 348-349)

Pages:

869-872

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.348-349.869

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Online since:

September 2007

Authors:

Fabrizio D'Errico, Marco Boniardi, Silvia Barella, Silvia Cincera

Keywords:

Contact Fatigue, Destructive Pitting, Micro-Pitting

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

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