| Autor: |
Soldatenkov, A. P., Naydenkin, E. V., Shanyavsky, A. A., Mishin, I. P., Eremin, A. V., Bogdanov, A. A., Panin, S. V. |
| Zdroj: |
Physical Mesomechanics; Dec2022, Vol. 25 Issue 6, p537-548, 12p |
| Abstrakt: |
In this work the behavior of near β titanium alloy VT22 treated by radial shear rolling is studied and compared at the mesoscale level under low-frequency (5 Hz, stress ratio 0.1) and high-frequency (20 kHz, stress ratio –1.0) loading at stresses below the yield stress of the material. It is found that, in comparable ranges of applied stresses of 950–600 MPa, the fatigue life of the material at low loading frequency is three orders of magnitude lower than the very high cycle fatigue life at high-frequency loading. This effect is studied by fractographic analysis providing the crack growth stages and lives and the relative crack growth period at the stage of fatigue striation formation, as well as by analyzing mechanical hysteresis loops. The low fatigue life of an ultrafine-grained material is associated with its sensitivity to loading frequency. The material behavior under low-frequency loading is mainly determined by the zones with reduced plasticity, because even at high applied stresses, though below the yield stress, the alloy cannot relax the cyclic loading energy for a long time, which accelerates the fatigue crack nucleation. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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