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Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel

Abstract : The low cycle fatigue behaviour of a 9Cr1MoNbV martensitic steel has been investigated at 350 °C in air and inlead–bismuth eutectic (LBE) with low and high oxygen content. Total strain controlled tests were performed from Δεt=0.40% to 1.2%. The material exhibited a pronounced cyclic softening in both environments. LBE reduced the fatigue resistance. LBE accelerated the formation of the long crack by promoting the growth of the first short cracks. A clear change in propagation mode was observed. In air, ductile fatigue striations were observed while in LBE a brittle fracture decorated by voluminous and largely spaced striations were visible. From EBSD analysis, it was concluded that in LBE, the long crack advanced quickly by repeated and discontinuous cleavage.
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https://hal.univ-lille.fr/hal-02310474
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Soumis le : mardi 13 octobre 2020 - 17:30:39
Dernière modification le : mercredi 4 novembre 2020 - 19:04:04

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Jean-Bernard Vogt, Jeremie Bouquerel, Carla Carlé, Ingrid Proriol Serre. Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel. International Journal of Fatigue, Elsevier, 2020, International Journal of Fatigue, ⟨10.1016/j.ijfatigue.2019.105265⟩. ⟨hal-02310474⟩

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