High-temperature ultra-high cycle fatigue test of TC17 titanium alloy

LI Jiu-kai; LIU Yong-jie; WANG Qing-yuan; HOU Fang

doi:10.13224/j.cnki.jasp.2014.07.008

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High-temperature ultra-high cycle fatigue test of TC17 titanium alloy

更新时间：2026-07-07

- High-temperature ultra-high cycle fatigue test of TC17 titanium alloy
- Issue 7, (2014)
- 作者机构：
  
  1. 四川大学建筑与环境学院能源工程安全与灾害力学教育部重点实验室,成都,610065
  2. 四川大学空天科学与工程学院,成都,610065
- 作者简介：
- 基金信息：
- DOI：10.13224/j.cnki.jasp.2014.07.008
  CLC：
- Published：2014
- 稿件说明：
移动端阅览
李久楷, 刘永杰, 王清远, 侯方. TC17钛合金高温超高周疲劳实验[J]. 航空动力学报, 2014, (7): 1567-1573. doi: 10.13224/j.cnki.jasp.2014.07.008

LI Jiu-kai, LIU Yong-jie, WANG Qing-yuan, et al. High-temperature ultra-high cycle fatigue test of TC17 titanium alloy[J]. 2014, (7).
李久楷, 刘永杰, 王清远, 侯方. TC17钛合金高温超高周疲劳实验[J]. 航空动力学报, 2014, (7): 1567-1573. doi: 10.13224/j.cnki.jasp.2014.07.008 DOI：

LI Jiu-kai, LIU Yong-jie, WANG Qing-yuan, et al. High-temperature ultra-high cycle fatigue test of TC17 titanium alloy[J]. 2014, (7). DOI： 10.13224/j.cnki.jasp.2014.07.008.

摘要

自主研发了高温超声疲劳（20 kHz）实验系统，并完成了TC17钛合金在室温、200℃和350℃条件下的疲劳性能实验研究.结果表明：TC17钛合金的动态弹性模量随温度升高呈线性减小.S-N曲线在室温下呈直线下降趋势，但在200℃和350℃条件下，S-N曲线在疲劳寿命为107周次处出现明显的拐点.断口分析表明疲劳裂纹萌生于试件表面或次表面，没有发现裂纹萌生于内部的情形，TC17钛合金的裂纹萌生可不依赖于试件内部的夹杂物或缺陷.高温不仅促进了裂纹的萌生还促进了裂纹的扩展.

Abstract

A high-temperature ultrasonic fatigue testing system was self-developed to evaluate the ultra-high cycle fatigue properties of TC17 titanium alloy. Ultrasonic (20 kHz) fatigue tests were performed at room temperature

200℃ and 350℃

respectively. The result shows that dynamic modulus of elasticity of TC17 titanium alloy decreases linearly with increasing temperature. The S-N curve presents a continuously descending shape at room temperature. While at 200℃ and 350℃

inflexion points of S-N curves can be observed clearly at fatigue life of 107 cycles. In addition

the results show that the fatigue cracks initiate from the surface or sub-surface of specimen and the interior crack initiation is not found. It indicates that the crack initiation of TC17 titanium alloy can be independent of interior inclusion or defect. Both the crack initiation and the crack propagation are promoted at high-temperature.

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