Subsurface Crack Initiation and Propagation Mechanisms in Very High Cycle Regime

Wen Jie Song; Wei Li

doi:10.4028/www.scientific.net/AMR.482-484.1524

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 482-484Subsurface Crack Initiation and Propagation...

Subsurface Crack Initiation and Propagation Mechanisms in Very High Cycle Regime

Abstract:

Rotary bending fatigue test was adopted to study the subsurface fracture property of a low alloy steel in very high cycle regime. As a result, the subsurface crack initiation and propagation with fine granular area (FGA) induced by subsurface incision is the predominant reason for fatigue facture of this low alloy steel in very high cycle regime of N>10⁶, which can be divided into three stages to discuss: (I) small crack propagation inside of FGA, (II) stable crack propagation in the fish-eye region outside of FGA and (III) final catastrophic fracture outside of fish-eye. The crack growth rate in the first stage is lower than 10^-11m/cycle, which means that the progress of FGA formation is extremely slow and consumes the great majority of total fatigue life. The interior stress intensity factor range corresponding to subsurface inclusion and the stress intensity factor ranges of FGA and fish-eye (ΔK_int-th, ΔK_FGA and ΔK_fish-eye) can be regarded as the threshold values of controlling subsurface crack propagation in these three stages, respectively.

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Periodical:

Advanced Materials Research (Volumes 482-484)

Pages:

1524-1529

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.482-484.1524

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Online since:

February 2012

Authors:

Wen Jie Song, Wei Li

Keywords:

Fatigue, Fine Granular Area (FGA), Fish-Eye, Subsurface Crack

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