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Article Dans Une Revue International Journal of Fatigue Année : 2018

On the crystallographic, stage I-like, character of fine granular area formation in internal fish-eye fatigue cracks

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Jérôme Crépin
André Pineau
Anne-Laure Rouffié
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Thilo F Morgeneyer

Résumé

The crystallographic character of fine granular area (FGA) formation from internal particles in martensitic high strength steel has been revealed by an assessment of the plastic zone size at the FGA border. This plastic zone size corresponded to about 3 times the martensite lath width. Tests at different temperatures (20 °C, 200 °C and 400 °C) revealed a decreasing FGA size with increasing temperature at constant applied stress amplitude. As a consequence, the critical stress intensity factor varied as the FGA decreased with temperature. In contrast, the critical plastic zone size remained constant and equal to the sizes of microstructural features. This represents a strong similarity between crystallographic, stage I-like, crack propagation and FGA formation in a vacuum.
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Dates et versions

hal-01633714 , version 1 (22-01-2020)

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Citer

Hayat Abdesselam, Jérôme Crépin, André Pineau, Anne-Laure Rouffié, P. Gaborit, et al.. On the crystallographic, stage I-like, character of fine granular area formation in internal fish-eye fatigue cracks. International Journal of Fatigue, 2018, 106, pp.132-142. ⟨10.1016/j.ijfatigue.2017.09.013⟩. ⟨hal-01633714⟩
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