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Variation of Rotating Bending Fatigue Characteristics by UNSM on Ti-6Al-4V
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 Title & Authors
Variation of Rotating Bending Fatigue Characteristics by UNSM on Ti-6Al-4V
Suh, Chang-Min; Pyoun, Young-Sik; Suh, Min-Soo;
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 Abstract
In order to analyze feasibility of replacing a conventional 6-mm Ti bar with a 5-mm bar, a series of rotating bending fatigue tests were carried out on Ti-6Al-4V bars by strengthening the fatigue performance using a special technique called UNSM (Ultrasonic Nanocrystal Surface Modification). The results of S-N curves clearly showed that the performance of the 5-mm titanium specimen was similar to that of the 6-mm specimen when the UNSM treatment was applied. The 5-mm treated specimen converged with small scattering band into the linear line of the non-treated 6-mm one. Below the fatigue life of cycles, the UNSM treatment did not show any significant superiority in the bending stress and fatigue life. However, over the fatigue life of cycles, the effect of UNSM was superior for each fatigue life, and the bending stress became longer and higher than that of the untreated one. In the case of 6-mm Ti-bar with UNSM, the fatigue limit was about 592 MPa, and there was fatigue strength increase of about 30.7% at the fatigue life of cycles compared to the untreated 6-mm bar. Therefore, the compressive residual stress made by the UNSM in Ti-6Al-4V increased the fatigue strength by more than 30%.
 Keywords
Rotating bending fatigue test;S-N curve;Ultrasonic nanocrystal surface modification technology;Compressive residual stress;
 Language
Korean
 Cited by
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