About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Early Stages of Fatigue Crack Initiation in the Cast and Wrought Polycrystalline Nickel-base Superalloy AD730TM |
Author(s) |
Julien Prouteau, Patrick Villechaise, Jonathan Cormier, Loic Signor |
On-Site Speaker (Planned) |
Julien Prouteau |
Abstract Scope |
In polycrystalline nickel-base superalloys, fatigue crack initiation from crystallographic facets is often found to occur within the coarser grains along or near twin boundaries in relation to the plastic slip band activity. The present work focuses on the early stages of fatigue cracks initiation in the polycrystalline nickel base superalloy AD730TM with a model bimodal microstructure chosen for this study. Symmetrical uniaxial tension-compression fatigue tests were performed at room temperature under total strain control. All fracture surfaces analyses showed crystallographic facets. Loading conditions were selected to perform interrupted fatigue tests including the detection and the statistical analysis of crack initiation sites using SEM and EBSD. The first detected cracks were mostly observed in coarse grains clusters in relation with the twin-boundaries. The configurations that favor crack initiation are discussed with the help of some 3D characterizations. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Other, Other |