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HomeKey Engineering MaterialsKey Engineering Materials Vols. 378-379Internal Fatigue Failure Mechanism of High...

Internal Fatigue Failure Mechanism of High Strength Steels in Gigacycle Regime

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Abstract:

Gigacycle fatigue behavior in high-strength steels tested under rotary bending fatigue was summarized in this paper. Characteristic of the very high cycle fatigue is to be caused the transition of fracture mode from surface-induced fracture to subsurface inclusion-induced one. In the vicinity of an inclusion at the origin of internal crack, granular-bright-facet (GBF) area was formed during extremely long fatigue cycles. It was pointed out that the formation of GBF area was an important factor for the control of the internal fatigue fracture in gigacycle regime. The GBF area revealed a very rough granular morphology compared with the area outside the GBF inside the fish-eye zone, and was related to the carbide distribution in the microstructure of the matrix. From the detailed observation of fracture surface and computer simulation by FRASTA method, the GBF area formation mechanism in a gigacycle fatigue regime was proposed as the ‘dispersive decohesion of spherical carbide model’.

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Advances in Understanding the Fatigue Behavior of Materials

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Periodical:

Key Engineering Materials (Volumes 378-379)

Pages:

65-80

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.378-379.65

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Cite this paper

Online since:

March 2008

Authors:

Kazuaki Shiozawa, Lian Tao Lu

Keywords:

Failure Mechanism, Fractography, High Strength Steel (HSS), Inclusion, Internal Fracture, Surface Fracture, Very High Cycle Fatigue (VHCF)

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