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Behaviour of short and long cracks in air and in liquid metal in T91 steel
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.
Keywords :
cycle fatigue behavior
Littérature citée [9 références]
https://hal.univ-lille.fr/hal-02277927
Contributeur : Lilloa Université de Lille Connectez-vous pour contacter le contributeur
Soumis le : jeudi 5 septembre 2019 - 10:45:15
Dernière modification le : vendredi 6 août 2021 - 09:48:05
Contributeur : Lilloa Université de Lille Connectez-vous pour contacter le contributeur
Soumis le : jeudi 5 septembre 2019 - 10:45:15
Dernière modification le : vendredi 6 août 2021 - 09:48:05
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