Heat dissipation and fatigue crack kinetic features of titanium alloy Grade 2 after laser shock peening

Abstract

The work is devoted to experimental investigation of the laser shock peening (LSP) effect on fatigue crack propagation and heat dissipation at the crack tip in specimens made of titanium alloy Grade 2 with a stress concentrator. It is shown that the LSP can lead both to positive and negative effect on fatigue lifetime. The effective processing scheme, which includes stress concentrator zone, was proposed. This type of treatment forms an optimal residual stress field, which slows down the crack initiation and propagation processes. The effective LSP processing scheme reduces the value of effective stress intensity factor and, as a consequence, effects on intensity of plastic deformation at the crack tip. This effect can be visualized by measurement of heat flux from the crack tip area. Both heat flux from the crack tip and duration of crack initiation are less in the LSP processed specimens. Microstructural investigations of LSP treated material near fatigue crack path have shown that structural defects (twins) that appear on the surface of the material as a result of LSP do not have a significant effect on the fatigue crack propagation, and the configuration of the residual stresses field created by LSP plays a decisive role. © 2022, Gruppo Italiano Frattura. All rights reserved.