Materials, Vol. 18, Pages 2484: Fatigue Life Anisotropy of API 5L X42 Pipeline Steel in Axial Force-Controlled Tests

Materials doi: 10.3390/ma18112484

Authors:
Manuel A. Beltrán-Zúñiga
Jorge L. González-Velázquez
Diego I. Rivas-López
Héctor J. Dorantes-Rosales
Carlos Ferreira-Palma
Felipe Hernández-Santiago
Fernando Larios-Flores

Fatigue endurance anisotropic behavior was evaluated for an API 5L X42 pipeline steel through axial force-controlled fatigue tests amongst Longitudinal, Diagonal, and Circumferential directions. This study shows that fatigue life anisotropy is mainly controlled by pearlite banding degree (Ai) and ferritic grain orientation (Ω12). Also, it is foreseen that the observed behavior can be related to the dislocation arrays generated by the cyclic loading in relation to microstructure orientation, and the interactions of the fatigue crack tip with the microstructure during the crack propagation stage.

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Manuel A. Beltrán-Zúñiga www.mdpi.com