Fatigue Fracture Behavior of Bearing Steel GCr15 in Very High Cycle Regime

Abstract:

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In order to investigate the fatigue behaviors in very high cycle fatigue regime of bearing steel GCr15 (Chinese standard), cantilever-type rotary bending fatigue test was carried out, by using an hourglass-shaped specimen. As a result, the S-N data were classified into surface grinding flaw or inclusion induced fracture mode, subsurface inclusion without ‘granular-bright-facet’ (GBF) area induced fracture mode and subsurface inclusion with GBF area induced fracture mode. Formation of a GBF area was clearly observed in the vicinity of subsurface inclusion on the fracture surface ruptured at high- cycle fatigue regime. The cause of the S-N curves of GCr15 obtained by this experiment continuously decreased, which is different from the common ‘duplex S-N’ curve. Experiments on fracture surface was carried out based on the ‘dispersive decohesion of spherical carbide’ model aimed to clarify the mechanism of the formation of GBF area.

Info:

Periodical:

Advanced Materials Research (Volumes 44-46)

Edited by:

Z.Y. Shen, M.N. James, W.D. Li, and Y.X. Zhao

Pages:

119-126

DOI:

10.4028/www.scientific.net/AMR.44-46.119

Citation:

J. W. Zhang et al., "Fatigue Fracture Behavior of Bearing Steel GCr15 in Very High Cycle Regime", Advanced Materials Research, Vols. 44-46, pp. 119-126, 2008

Online since:

June 2008

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Price:

$35.00

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