|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Identifying Failure Locations in Nickel Based Superalloy R88DT under Cyclic Loadings, via Crystal Plasticity Simulations
||Monica Soare, Shenyan Huang, Shakhrukh Ismonov, Andrew Detor
|On-Site Speaker (Planned)
The current study focuses on developing visco-plastic models for polycrystalline material R88DT, capturing the critical deformation mechanisms at various temperature levels. The polycrystalline nickel – based alloys (as R88DT) are materials of choice for gas turbine disks due to their excellent high temperature properties as strength, creep resistance, corrosion and oxidation resistance as well as long fatigue life. The plasticity models were calibrated on tension and compression tests performed on representative single crystals with controlled crystallographic orientations and validated by comparison with experimental data performed for polycrystalline structures. The models were subsequently used in complex crystal plasticity simulations to identify the special microstructural features with high probability of failure under cyclic loading (as for example annealing twins with high Schmid factors in primary/secondary slip systems), and to dissociate between the crack nucleation locations at low (75F) and high (1200F) temperatures.
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