Sammanfattning
The presence of grain boundaries in the microstructure of metallic materials causes heterogeneous distributions of dislocation density. In the present contribution, the evolution of dislocation density is viewed as a reaction-diffusion system, involving mobile and immobile dislocations. Gradient effects are introduced by making the immobilization of dislocations sensitive to presence of grain boundaries. The model provides a macroscopic yield stress behavior of Hall-Petch type, without explicitly incorporating a yield stress dependence on the grains size. In addition, the model is employed in a cellular automaton algorithm, allowing a polycrystalline microstructure to evolve due to dynamic recrystallization, confirming that the introduced gradients provide important additions to recrystallization modeling.
Originalspråk | engelska |
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Sidor | 211-214 |
Status | Published - 2012 |
Evenemang | 25th Nordic Seminar on Computational Mechanics, 2012 - Lund, Lund, Sverige Varaktighet: 2012 okt. 25 → 2012 okt. 26 Konferensnummer: 25 |
Konferens
Konferens | 25th Nordic Seminar on Computational Mechanics, 2012 |
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Förkortad titel | NSCM |
Land/Territorium | Sverige |
Ort | Lund |
Period | 2012/10/25 → 2012/10/26 |
Ämnesklassifikation (UKÄ)
- Maskinteknik