| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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| Presentation Title |
Deformation Mechanisms and Crack Initiation Sites in Haynes 244® Under Low-Cycle Fatigue |
| Author(s) |
Ignacio Escobar-Moreno, Zheng Ye, Eugenia Nieto-Valeiras, Biaobiao Yang, Victoria A. Tucker, Michael S. Titus, Javier Llorca |
| On-Site Speaker (Planned) |
Javier Llorca |
| Abstract Scope |
Haynes 244® is a Ni-based superalloy that contains 40 vol. % of coherent Ni2(Cr,Mo,W) precipitates with lenticular shape. The deformation mechanisms of this alloy as well as the preferential crack initiation sites under strain-controlled fully-reversed cyclic deformation were investigated at 23ºC. Activation of slip and twinning was monitored by means of electron back-scatter diffraction, conventional slip trace analysis as well as high-resolution digital image correlation in samples subjected to different number of fatigue cycles. In addition, lamella were extracted by focus ion beam machining of selected locations to analyze the activation of slip and twinning in the transmission electron microscope. In addition, crack initiation locations in the microstructure were found by means of scanning electron microscopy analysis of the sample surface after different number of fatigue cycles. Cracks nucleated within the grains (intragranular cracks) as well as at grain/twin boundaries where either transfer or blocking of the deformation traces occurred. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Copper / Nickel / Cobalt, |