The role of slip transfer at grain boundaries in the propagation of microstructurally short fatigue cracks in Ni-based superalloys. (15th March 2019)

• Record Type: Journal Article
• Authors: Jiménez, M.; Ludwig, W.; Gonzalez, D.; Molina-Aldareguia, J.M.
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 261
• Page End: 265
• Publication Date: 2019-03-15
• Subjects: X-ray synchrotron radiation -- Grain boundary -- High cycle fatigue -- Superalloy -- Microstructurally short crack propagation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.11.008
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Crack initiation and propagation under high-cycle fatigue conditions have been investigated for a polycrystalline Ni-based superalloy by in-situ synchrotron assisted diffraction and phase contrast tomography. The cracks nucleated along the longest coherent twin boundaries pre-existing on the specimen surface, that were well oriented for slip and that presented a large elastic incompatibility across them. Moreover, the propagation of microstructurally short cracks was found to be determined by the easy slip transfer paths across the pre-existing grain boundaries. This information can only be obtained by characterization techniques like the ones presented here that provide the full set of 3D microstructural information. Graphical Abstract: