Abstract
The effect of ultrasonic shot peening (USSP) was studied on microstructural modification in the surface region and low cycle fatigue (LCF) behavior of the Ti–6Al–4V alloy, at room temperature. Nanostructure of 17–25 nm was developed in surface region of the alloy by USSP. Fatigue life of the USSPed samples was found to increase progressively with decrease in strain amplitude to much larger extent in comparison with those of the non-USSPed ones. Fatigue life of the USSPed sample was enhanced by four times at the lowest strain amplitude of ±0.60%. There was cyclic softening from the beginning until the failure, at the high strain amplitudes (Δεt/2≥ ±0.80%) whereas cyclic hardening was exhibited during the initial 100 cycles, followed by softening at the lower strain amplitudes (Δεt/2 ≤ ±0.70%). Deformation structure of the samples, tested at different strain amplitudes was analysed using TEM. The results are discussed in terms of increase in the resistance of the material against crack initiation due to grain refinement in the surface region and the associated compressive stresses induced from USSP.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.