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Title: Rolling and Rolling-Sliding Contact Fatigue Failure Mechanisms in 32 CrMoV 13 Nitrided Steel—An Experimental Study
Authors: Coelho, Luís 
Batista, António C. 
Nobre, João Paulo 
Marques, Maria José 
Keywords: rolling contact fatigue; nitriding; X-ray diffraction; residual stresses; fatigue failure mechanisms
Issue Date: 2021
Publisher: MDPI
Serial title, monograph or event: Applied Sciences (Switzerland)
Volume: 11
Issue: 21
Abstract: The aim of this work is to characterize the rolling and rolling-sliding contact fatigue failure mechanisms on the 32CrMoV13 nitrided steel. During rolling contact fatigue tests (RCF), two general features were observed: specimens presenting short lives and rough and sharpened spalling damage and specimens presenting long lives and only microspalling marks. It was possible to determine a contact fatigue limit of 3 GPa. During rolling-sliding contact fatigue tests (RSCF), a clearly different behaviour between the two specimens in contact has been observed: the driver shows circumferential and inclined cracks and only inclined cracks appear in the follower. This behaviour can be understood if the effect of the residual stress state in near-surface layers is considered. Before RCF tests, the residual stresses are compressive in all near-surface layers. After RCF tests, strong residual stress relaxation and even reversing behaviour was observed in the axial direction, which facilitates the surface crack initiation in the circumferential direction at rolling track borders.
ISSN: 2076-3417
DOI: 10.3390/app112110499
Rights: openAccess
Appears in Collections:I&D CFis - Artigos em Revistas Internacionais

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