Thermal activation of fatigue crack growth: analysing the mechanisms of fatigue crack propagation in superalloys
Starink, M.J. and Reed, P.A.S. (2008) Thermal activation of fatigue crack growth: analysing the mechanisms of fatigue crack propagation in superalloys. Materials Science and Engineering: A, 491, (1-2), 279-289. (doi:10.1016/j.msea.2008.02.016).
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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.
|Keywords:||activation energy, N18, U720Li, RR1000, nickel superalloy, fatigue crack propagation, turbine disc alloys, creep, oxidation, fractography, thermal activation, diffusion, creep-fatigue|
|Subjects:||T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
T Technology > TN Mining engineering. Metallurgy
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
|Date Deposited:||05 Feb 2008|
|Last Modified:||08 Jun 2012 12:20|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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