Effect of beta flecks on low-cycle fatigue properties of Ti-10V-2Fe-3Al |
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Authors: | Zeng Weidong Zhou Yigang Yu Hanqing |
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Affiliation: | (1) Northwestern Polytechnical University, College of Materials Science and Engineering, 710072 Xi’an, Shaanxi, China |
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Abstract: | The effect of beta flecks on low-cycle fatigue (LCF) properties was investigated at room temperature for a high-temperature
(α + β)-processed and also a β-processed Ti-10V-2Fe-3Al alloy. For both the (α + β)-processed and the β-processed material, beta flecks had a significant influence on LCF and tensile properties. The materials with beta flecks
showed a loss in LCF life and ductility. Larger beta flecks resulted in lower LCF life and ductility. It seemed that β-forged material contained much smaller beta flecks but had a similar detrimental effect on LCF properties as the (α + β)-processed one. Based on the diffusion calculation, it could be concluded that chemical composition inhomogenieties could
not be reduced by using beta forging in the 820 °C β region. Extensive light microscopy and scanning electron microscopy (SEM) observations showed that beta flecks were susceptive
to crack nucleation and propagation. |
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Keywords: | beta flecks intergranular cracking low-cycle fatigue Ti-10V-2Fe-3 Al alloy |
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