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A Study of Thermal Stability of Residual Stresses and Fatigue life of Laser Shock Peened Ti-6Al-2Sn-4Zr-2Mo alloy
Summary
This aerospace engineering study examined how laser shock peening—a process that introduces compressive stress into metal surfaces—affects the fatigue life and thermal stability of a titanium alloy used in high-temperature aerospace applications. This is a materials engineering study with no relevance to microplastic pollution.
This is a study of the effects of laser shock peening (LSP) on residual stress generation, thermal stability of the LSP induced residual stresses and the associated fatigue strength enhancement in the temperature range of (315 0 C-538 0 C;600 0 F-1000 0 F) the aerospace alloy .LSP is a novel surface treatment process that has proven to enhance he fatigue strength/life of metallic components is a mechanical surface treatment process that has proven to enhance the fatigue life of components.The findings of this study are useful to assess the application of LSP process for industrial and aerospace components that operate at elevated temperatures.Initial experiments were performed to identify the LSP process parameters (energy) range on Ti-6242 to induce the maximum compressive stress.Results showed that compressive residual stresses increased with increasing energy and remained constant at 800 Mpa, above 8J (8GW/cm 2 ) (saturation).Thermal relaxation studies of the LSP induced residual stresses were conducted on specimens processed at 8GW/cm 2 (at 8 Joules).LSP processed samples were exposed to temperatures of 315 0 C (600 0 F), 482 0 C (900 0 F) and 538 0 C (1000 0 F) for durations of 10 minutes to 100 hours.No appreciable relaxation was observed at 315 0 C even after long exposures.Stresses relaxed to about half the initial value when exposed to 482 0 C for 24 hrs and 538 0 C for 1hr.This suggests that the benefits of LSP can be realized even at 538 0 C. Zener-Wert-Avarami analysis of the kinetics of residual stress relaxation gave an activation enthalpy of 116 KJ/mol, which is in the range reported for self diffusion in Ti-alloys.This suggests that residual stress relaxation is associated with a creep-like mechanism involving rearrangement and annihilation of dislocations by climb.
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