Thermal activation of fatigue crack growth: analysing the mechanisms of fatigue crack propagation in superalloys
A method for deriving apparent activation energies, Eapp, for fatigue crack growth (FCG) is presented. It is shown how these Eapp values can be used to analyse the main underlying mechanism causing the progression of the crack. The Eapp values for fatigue crack growth in air and vacuum, and with and...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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2008-09.
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| Online Access: | Get fulltext |
| LEADER | 01175 am a22001333u 4500 | ||
|---|---|---|---|
| 001 | 50250 | ||
| 042 | |a dc | ||
| 100 | 1 | 0 | |a Starink, M.J. |e author |
| 700 | 1 | 0 | |a Reed, P.A.S. |e author |
| 245 | 0 | 0 | |a Thermal activation of fatigue crack growth: analysing the mechanisms of fatigue crack propagation in superalloys |
| 260 | |c 2008-09. | ||
| 856 | |z Get fulltext |u https://eprints.soton.ac.uk/50250/1/Thermal_activation_FCG_-_Starink_%2526_Reed_2008.pdf | ||
| 520 | |a A method for deriving apparent activation energies, Eapp, for fatigue crack growth (FCG) is presented. It is shown how these Eapp values can be used to analyse the main underlying mechanism causing the progression of the crack. The Eapp values for fatigue crack growth in air and vacuum, and with and without a dwell are obtained for a range of Ni based superalloys for turbine disc applications. The apparent activation energies range from about zero to about 300kJ/mol. The analysis allows identification of alloys that are prone to FCG through diffusion controlled mechanisms, notably grain boundary oxidation or grain boundary creep, as well as alloys that are nearly immune to FCG by grain boundary oxidation or creep. | ||
| 655 | 7 | |a Article | |