Effect of Grain Disorientation on Early Fatigue Crack Propagation in FCC Polycrystals: Dislocation Dynamics Simulations and Corresponding Experimental Validation

3-dimensional dislocation dynamics (DD) simulations are performed, in face-centred cubic bi-crystals, to study the microcrack interaction with first microstructural barrier under high cycle fatigue loading conditions. Based on experimental observations, we presumed that microcracks are blocked by gr...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2016-03, Vol.69 (2), p.477-481
Main Authors: Robertson, C., Prasad Reddy, G. V., Déprés, C., Fivel, M.
Format: Article
Language:English
Subjects:
Chemical Sciences
Chemistry and Materials Science
Corrosion and Coatings
Material chemistry
Materials Science
Metallic Materials
Technical Paper
Tribology
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Summary:3-dimensional dislocation dynamics (DD) simulations are performed, in face-centred cubic bi-crystals, to study the microcrack interaction with first microstructural barrier under high cycle fatigue loading conditions. Based on experimental observations, we presumed that microcracks are blocked by grain boundaries and that subsequent propagation/transmission occurs by the growth of surface relief in a secondary grain adjoining the primary crack. This mechanism is herein called indirect transmission and is found to strongly depend on grain-to-grain disorientation. A semi-analytical model proposed earlier is discussed with the DD simulation results in the context of first-barrier compliance. The proposed model describes the documented experimental results related to the effect of grain size, grain misorientation and microcrack propagation kinetics in fatigued 316L steel polycrystals.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-015-0754-y