Abstract : The low cycle fatigue behaviour of a 9Cr1MoNbV martensitic steel has been investigated at 350°C in air and in lead-bismuth eutectic (LBE).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 ofthe 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.
https://hal.univ-lille.fr/hal-02277927
Contributeur : Lilloa Université de Lille
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Soumis le : jeudi 5 septembre 2019 - 10:45:15
Dernière modification le : vendredi 6 septembre 2019 - 01:17:19
Jean Bernard Vogt, Carla Carlé, Jeremie Bouquerel, Ingrid Proriol Serre. Behaviour of short and long cracks in air and in liquid metal in T91 steel. FATIGUE 2018, May 2018, Poitiers, France. ⟨10.1051/matecconf/201816503016⟩. ⟨hal-02277927v2⟩
