Compressive Residual Stresses and Associated Surface Modifications Induced in Ti6Al4V by Laser Shock Processing

Abstract:

Laser shock processing (LSP) is increasingly applied as an effective technology for the improvement of metallic materials’ mechanical and surface properties in different types of components, mostly as a means of enhancement of their fatigue life behavior. As reported in previous contributions by the authors, a main effect resulting from the application of the LSP technique consists in the generation of relatively deep compression residual stresses fields into metallic components allowing an improved mechanical behaviour. In this paper, the special case of Ti6Al4V alloy is considered from a more fundamental point of view, with specific consideration of the microstructural changes and residual stresses fields justifying those macroscopic effects. From a concrete point of view, the effect of the application of different typical LSP intensities on the microstructure and residual stresses fields introduced in this material and their possible correlation to the associated surface effects are analyzed.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 1408-1413
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.1408
• Online since: November 2016
• Authors: José Luis Ocaña*, J.L. González-Carrasco, M. Lieblich, S. Barriuso, J.A. Porro, L. Ruiz de Lara, M. Díaz, J.A. Santiago
• Keywords: Corrosion, Laser Shock Processing, Mechanical Properties, Microstructure, Residual Stress, Surface Properties

References

[1] C. Rubio-González et al.: Mat. Sci. Eng. A, 386, 291-295 (2004).

[2] U. Sánchez-Santana et al.: Wear, 260, 847-854 (2006).

[3] C.S. Montross et al.: Int. J. of Fatigue, 24, 1021-1036 (2002).

[4] S.R. Mannava et al.: Int. J. Struct. Integ. 2, 101-113 (2011).

[5] Y. Sano et al.: Nucl. Inst. Meth. Phys. Res. B, 121, 432-436 (1997).

[6] C. Rubio-González et al.: Mat. Sci. Eng. A, 528, 914-919 (2011).

[7] J.L. Ocaña et al.: Materials Science Forum, 638-642, 2446-2451 (2010).

[8] J.L. Ocaña et al.: Materials Science Forum, 706-709, 2565-2570 (2012).

[9] S. Barriuso et al.: Wear 270, 634–639 (2011).

[10] M. Lieblich et al.: J. Mech. Behaviour of Biomedical Mat., 54, 173–184 (2016).

[11] K.Y. Luo et al.: Mat. Sci. Eng. A, 528, 4783-4788 (2011).

[12] A.Y. Chen et al.: Acta Materialia, 59, 3697–3709 (2011).