Very high cycle fatigue rupture mode at high temperatures of Ni-based superalloys coated with a slurry aluminide - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Journal of Fatigue Année : 2024

Very high cycle fatigue rupture mode at high temperatures of Ni-based superalloys coated with a slurry aluminide

Résumé

The failure mode in the very high cycle fatigue (VHCF) regime of four different nickel-based single-crystal (SX) superalloys coated with a slurry aluminide has been investigated at high temperature (1,000 °C) and under fully-reversed conditions (Rε = -1). The 3rd generation superalloy CMSX-4 Plus presented a lifetime one to two order(s) of magnitude higher than AM1, CMSX-4 and Rene N5 for the same applied alternating stress (180 MPa). The crack initiation zones were distinct. CMSX-4 Plus samples failed from the interdiffusion zone (IDZ) while AM1, CMSX-4 and Rene N5 samples failed from casting pores close to the IDZ. The interaction between the casting pore, the IDZ and the rough zone is believed to control the premature crack initiation. A new crack initiation mode in VHCF for coated specimens is proposed in this article and the competition between crack initiation from a casting pore or from the surface is considered and discussed.
Fichier non déposé

Dates et versions

hal-04432098 , version 1 (01-02-2024)

Identifiants

Citer

Luciana Maria Bortoluci Ormastroni, Thomas Kepa, Alice Cervellon, Patrick Villechaise, Fernando Pedraza, et al.. Very high cycle fatigue rupture mode at high temperatures of Ni-based superalloys coated with a slurry aluminide. International Journal of Fatigue, 2024, 180, pp.108107. ⟨10.1016/j.ijfatigue.2023.108107⟩. ⟨hal-04432098⟩
7 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More