Surface Slip Markings Of Fatigue-Tested Materials Hardened By Precipitates: Dislocation Dynamics Approach

Abstract:

Fatigue simulations are performed by using the new parallel discrete dislocation dynamics code. The effects of particles (shearable or non-shearable) on the fatigue properties, e.g. the cyclic mechanical response and the surface markings, are presented. The simulated results are found to represent the features observed in the experiments well. Fatigue of materials containing both shearable and non-shearable particles (bimodal case) is also simulated. The Orowan loops accumulated around the non-shearable particles promote a dispersion of the slips by a local cross slip, and the fatigue features of the bimodal case are in between those of the shearable and the non-shearable particle case.

• Periodical: Solid State Phenomena (Volume 119)
• Pages: 99-102
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.119.99
• Online since: January 2007
• Authors: Chan Sun Shin, Marc Fivel, Christian F. Robertson, Wheung Whoe Kim
• Keywords: Dislocation Dynamics, Fatigue, Precipitation-Hardened Material, Surface Steps

References

[1] S. Suresh: Fatigue of Materials (Cambridge University Press, United Kingdom 1998).

[2] C. Déprés, C.F. Robertson and M. Fivel: Phil. Mag. Vol. 84 (2004), p.2257.

[3] C. Déprés, C.F. Robertson and M. Fivel: Phil. Mag. Vol. 86 (2006), p.79.

[4] C. Shin, M. Fivel, M. Verdier and S.C. Kwon: J. Comp. Phys. in press.

[5] C. Shin, M.C. Fivel, M. Verdier and C. Robertson: Mat. Sci. Eng. A. Vol. 400-401 (2005), p.166.

[6] J.P. Hirth and J. Lothe: Theory of Dislocations (Krieger Publishing Company, Florida 1992).

[7] D.M. Barnett: Phil. Mag. Vol. 51 (1985), p.383.

[8] V. Gerold and D. Steiner: Scrip. Metal. Vol. 16 (1982), p.405.

[9] M. Clavel and A. Pineau: Mat. Sci. Eng. Vol. 55 (1982), p.157.