Slip Activity of Persistent Slip Bands in early Stages of Fatigue Life of Austenitic 316L Steel

Abstract:

Flat specimen of 316L steel was cyclically pre-deformed with constant plastic strain amplitude to early stage of fatigue life relevant to the period of cyclic strain localization and fatigue crack initiation. To document slip activity and reversibility/irreversibility of persistent slip bands (PSBs) in situ experiments in the high-resolution SEMFEG under special imaging conditions were performed. The half-and full-cycle slip activity and distribution of plastic strain within PSBs in individual grains were investigated via slip steps generated in half-and full-cycle deformation after intermediate vibration polishing. After completion of in situ tests the surface topography in identical locations was quantitatively documented using atomic force microscopy (AFM).

• Periodical: Key Engineering Materials (Volumes 592-593)
• Pages: 785-788
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.592-593.785
• Online since: November 2013
• Authors: Jiří Man, Anja Weidner, Petr Klapetek, Jaroslav Polák
• Keywords: 316l Steel, Half-Cycle Deformation, Persistent Slip Band (PSB), Slip Activity, Slip Reversibility

References

[1] J.M. Finney and C. Laird: Phil. Mag. Vol. 31 (1975), p.339.

[2] H. Mughrabi: Metall. Mater. Trans. A Vol. 40A (2009), p.1257.

[3] J. Man, K. Obrtlík and J. Polák: Phil. Mag. Vol. 89 (2009), p.1295.

[4] J. Man, P. Klapetek, O. Man et al.: Phil. Mag. Vol. 89 (2009), p.1337.

[5] A. Shyam and W.W. Milligan: Acta Mater. Vol. 53 (2005) p.835.

[6] H. Mughrabi: Acta Mater. Vol. 61 (2013), p.1197.

[7] C. Wejdemann and O.B. Pedersen: Mater. Sci. Eng. A Vol. 387–389 (2004), p.556.

[8] A. Weidner, R. Beyer, C. Blochwitz et al.: Mater. Sci. Eng. A Vol. 435–436 (2006), p.540.

[9] A. Weidner, C. Blochwitz, W. Skrotzki et al.: Mater. Sci. Eng. A Vol. 479 (2008), p.181.

[10] A. Weidner, J. Man, W. Tirschler et al.: Mater. Sci. Eng. A Vol. 492 (2008), p.118.