Effects of shot-peening and re-shot-peening on four-point bend fatigue behavior of Ti–6Al–4V
| Autor: | Chi-Sing Man, X.P. Jiang, Michael Shepard, Tongguang Zhai |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Materials science
business.industry Mechanical Engineering Alloy Titanium alloy Test method Structural engineering engineering.material Condensed Matter Physics Shot peening Fatigue limit Compressive strength Mechanics of Materials Residual stress engineering General Materials Science Ti 6al 4v Composite material business |
| Zdroj: | Materials Science and Engineering: A. :137-143 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2007.01.156 |
| Popis: | The application of shot-peening to improve performance and reduce scatter in the high cycle fatigue regime is common in aerospace production practice. Frequently, aerospace components are re-shot-peened during refit to “restore” compressive stresses that may have redistributed in service. Since shot-peening is an impact process that can cause various surface artifacts, it is not clear what effect this re-shot-peening process has on fatigue properties. In the current study, the effects of shot-peening and re-shot-peening on the profile of surface residual stress and the four-point bend fatigue behavior of Ti–6Al–4V(wt.%) alloy were investigated at room temperature and 150 °C. A step-test method was used to determine the fatigue strength of the shot-peened and re-shot-peened specimens in different conditions. Shot-peening improved the fatigue strength of the alloy from about 65% σ y to 71% σ y ( σ y is the yield strength of this alloy at room temperature). The fatigue limits of the shot-peened Ti–6Al–4V alloy at room temperature and 150 °C were found to be almost identical. Residual stresses did not seem to redistribute significantly under the fatigue loading at room temperature and 150 °C. Both shot-peening and re-shot-peening significantly enhanced the fatigue strength over that of the un-shot-peened alloy. No negative effects of re-shot-peening were observed. |
| Databáze: | OpenAIRE |
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