Fatigue Behavior of Titanium Alloy Ti-4Al-2V under High Cycle Loading at Elevated Temperature
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摘要: 采用旋转弯曲的加载方式完成近α相Ti-4Al-2V钛合金棒材在350℃空气中的常规成组法疲劳试验和升降法疲劳试验,对试验数据进行分析和处理,对疲劳断口进行扫描电子显微镜(SEM)分析。结果表明,Ti-4Al-2V钛合金棒材理论耐久极限应力为339 MPa,稍高于经验公式计算值,材料具有较好抗高周疲劳的性能;与常温试验结果(394 MPa)相比,高温会加速试样的氧化,降低材料的疲劳寿命。
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关键词:
- Ti-4Al-2V钛合金棒材 /
- 高周疲劳 /
- 断口
Abstract: The high cycle fatigue behavior of titanium alloy Ti-4Al-2V rods with near α phase at elevated temperature（350℃） was evaluated.The traditional high cycle fatigue（HCF） tests with groupspecimen as well as the up-and-down tests were performed under bending and rotating loadings at 350℃ in air atmosphere.The experimental data were analyzed and the theoretical S-N curve,the P-S-N curve and the S-N curve for nuclear design were processed,and the fracture morphology was analyzed by SEM.The results indicate that Ti-4Al-2V rods have good resistance to high cycle fatigue and the value is 339 MPa which is slightly higher than the calculated value from the corresponding equation,and elevated temperature accelerated the oxidation of the specimen which decreased the fatigue duration when compared with the result obtained at low temperature which is around 394 MPa.-
Key words:
- Titanium alloy Ti-4Al-2V rods /
- High cycle fatigue /
- Fracture morphology
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