About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Effects of Frequency and Dwell on the Fatigue Crack Propagation in Single Crystal Ni-based Superalloy CMSX-4 at Intermediate Temperatures |
Author(s) |
Joseph Doyle, Angelos Evangelou , Nong Gao, Edward Saunders, Jane Woolrich, Mark Hardy, Philippa Reed |
On-Site Speaker (Planned) |
Joseph Doyle |
Abstract Scope |
Ni-based single crystal superalloys are used as turbine blades due to their excellent combination of high temperature mechanical properties and corrosion resistance. The effects of oxidation and dwell will influence fatigue crack propagation rates and damage mechanisms at elevated temperatures. In this work the effects of frequency on the fatigue crack growth rate have been studied on CMSX-4 at intermediate service temperatures (450-550°C) through a series of frequency scan tests to obtain the transition from cycle to time dependent crack growth. Tests were conducted on single edge notched bend bars in air at a load ratio 0.1 at constant ΔK. Frequencies tested range from high frequency 5Hz to low frequency long dwell waveforms. Fatigue crack propagation mechanisms have been compared between each frequency using a combination of optical microscopy, scanning electron microscopy and Alicona IFM to characterise the fracture surfaces and assess fatigue and time dependent failure mechanisms. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Characterization, Other |