Abstract
A strain-gradient crystal plasticity framework based on physical dislocation mechanisms is developed for simulation of the experimentally observed grain size e #64256;ect on the low cycle fatigue of a CoCr alloy. Finite-element models of the measured microstructure are pre- sented for both as-received and heat-treated CoCr material, with signi #64257;cantly di #64256;erent grain sizes. Candidate crystallographic slip-based parameters are implemented for prediction of fatigue crack initiation. The measured bene #64257;cial e #64256;ects of #64257;ne grain size on both cyclic stressstrain response and crack initiation life are predicted. The build-up of geometrically necessary dislocations as a result of strain-gradients, leading to grain-size-dependent material hardening, is shown to play a key role.
| Original language | English (Ireland) |
|---|---|
| Journal | Acta Materialia |
| Volume | 78 |
| Publication status | Published - 1 Jan 2014 |
Authors (Note for portal: view the doc link for the full list of authors)
- Authors
- Sweeney, C.A., O'Brien, B. Dunne, F.P.E., McHugh, P.E. Leen, S.B.