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- W2002022095 abstract "The creep performance of 〈001〉-orientated CMSX-4 superalloy single crystals at temperatures beyond 1000°C is analysed. Rafting of the γ′ structure occurs rapidly, e.g. for the 1150°C/100 MPa tests rafting is completed within the first 10 h. At this stage and for a considerable time thereafter the creep strain rate decreases with increasing strain, implying a creep hardening effect which is absent at lower temperatures when the kinetics of rafting is less rapid. Once a critical strain ε* of (0.7±0.3)% is reached, the creep strain increases dramatically and failure occurs within a few tens of hours. It is demonstrated that methods of interpretation which, assume a proportionality between the creep strain rate and creep strain, are unable to account for creep hardening which occurs as a consequence of rafting. A modification is proposed which accounts for the blocking of the glide/climb of {111}〈11̄0〉 creep dislocations which occurs as the number of vertical γ channels is reduced and cellular dislocation networks become stabilized. Consequently, failure must be taken to be associated with creep cavitation, which occurs predominantly around casting porosity. It is emphasized that more work is required to quantify the interaction between the various creep damage mechanisms." @default.
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- W2002022095 title "Creep of CMSX-4 superalloy single crystals: effects of rafting at high temperature" @default.
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