20kHz下TC17钛合金超高周疲劳性能研究

高潮; 程礼; 彭桦; 申景生; 邱辰霖; 刘延杰

20kHz下TC17钛合金超高周疲劳性能研究

1.
空军工程大学工程学院, 西安 710038
2.
重庆大学通信工程学院, 重庆 400044

基金项目: 国家自然科学基金(50975284); 维修预研基金(5132701)

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出版历程
- 收稿日期: 2011-05-22
- 修回日期: 2012-02-12
- 刊出日期: 2012-04-28

Investigation of ultra-high cycle fatigue behavior of TC17 alloy at a frequency of 20kHz

1.
The Engineering Institute, Air Force Engineering University, Xi’an 710038, China
2.
School of Communication Engineering, Chong Qing University, Chongqing 400044, China

摘要

摘要: 应用基于压电超声疲劳试验技术开发的20kHz弯曲疲劳试验系统,完成了室温下TC17合金超高周疲劳试验.结果表明:在疲劳循环大于10⁷周次时,试样仍会发生疲劳断裂,疲劳强度随循环次数的增加而下降,并不存在明显的疲劳极限.TC17合金的应力-寿命(S-N)曲线在10⁷~10⁹周次的范围内为连续下降型.光学显微镜发现,TC17合金的疲劳破坏主要起源于试样表面.当存在夹杂物时,疲劳裂纹从距离表面很近的夹杂物处萌生,能谱分析表明夹杂物的成分主要是铝的氧化物.
- 弯曲疲劳 /
- 超高周疲劳 /
- 应力-寿命 (S-N) 曲线 /
- TC17合金 /
- 疲劳强度
Abstract: The bending fatigue system was developed using the piezoelectric ultrasonic fatigue testing technology and experimental investigation of the ultra-high cycles fatigue life for TC17 alloy subjected to bending fatigue deformation has been conducted.The experimental resultes show that the specimens were tested to failure in the range of 10⁷-10⁹ cycles and the fatigue limit decreases with the increasing number of cycles between 10⁷ and 10⁹ for R=-1.0 and there was no obvious fatigue limit.The S-N curve for TC17 is a continuous decline curve between 10⁷ and 10⁹ cycles.The fractographic study showes that fatigue failures are mostly initiated at the surface of the test specimens.When there are subsurface inclusions,fatigue cracks initiated from subsurface inclusions,and the composition of inclusions is mainly oxides of aluminums.
- bending fatigue /
- ultra-high cycles fatigue /
- S-N(stress-number of cycles to failure) curve /
- TC17 alloy /
- fatigue strength

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参考文献(14)

[1]	Marines I,Dominguez G,Baudry G,et al.Fatigue and fracture crack growth of aluminum alloys at very high numbers of cycles[J].International Journal of Fatigue,2003,25(10):37-46.
[2]	Papakyriacou M,Mayer H,Pypen C,et al.Fatigue behaviour of dup1ex phase alloys in the very high cycle regime[J].Mater. Sci. Eng. A,2001,308(1):43-52.
[3]	Stanzl-Tschegg S E,Mayer H.How and why the fatigue S-N curve does not approach a horizontal assymptote[J].International Journal of Fatigue,2001,23(Supplement):231-237.
[4]	McEvily A J,Nakamura T,Oguma H,et al.On the mechanism of very high cycle fatigue in Ti-6Al-4V[J].Scripta Materialia,2008,59:1207-1209.
[5]	USDepartment of Defense.MIL-HDBK,1783BW/CHANGE2, engine structural integrity programs(ENSIP)[S].Washington:US Department of Defense,2004.
[6]	Morrissey R,Nicholas T.Staircase testing of a titanium alloy in the gagacycle regime[J].International Journal of Fatigue,2006,28:1577-1582.
[7]	周承恩,洪友士.GCrl5钢超高周疲劳行为的实验研究[J].机械强度,2004,26(Supplement):157-160. ZHOU Chengen,HONG Youshi.Experimental investigation on very-high-cycle fatigue of GCr15 steel[J].Journal of Mechanical Strength,2004,26(Supplement):157-160.(in Chinese)
[8]	XUE Hongqian,TAO Hong,WANG Qingyuan,et al.Development of a three-point bending fatigue testing methodology at 20kHz frequency[J].International Journal of Fatigue,2007,29:2085-2093.
[9]	唐维维,王弘.超声弯曲疲劳实验方法及其应用[J].力学与实践,2008,30(6):43-46. TANG Weiwei,WANG Hong.Method of ultrasonic bending fatigue and application[J].Mechanics in Engineering,2008,30(6):43-46.(in Chinese)
[10]	Ritchie R O,Boyce B L,Campbell J P,et al.Thresholds for high-cycle fatigue in a turbine engine Ti-6Al-4V alloy[J].International Journal of Fatigue,1999,21:653-662.
[11]	McEvily A J,Nakamura T,Oguma H,et al.On the mechanism of very high cycle fatigue in Ti-6Al-4V[J].Scripta Materialia,2008,59:1207-1209.
[12]	Zuo J H,Wang Z G,Han E H.Effect of microstructure on ultra-high cycle fatigue behavior of Ti-6Al-4V[J].Materials Science and Engineering A,2008,473:147-152.
[13]	Lanning D B,Nicholas T,Haritos G K.Effect of plastic prestrain on high cycle fatigue of Ti-6Al-4V[J].Mechanics of Materials,2002,34:127-134.
[14]	Pollak R D.Analysis of methods for determining high cycle fatigue strength of a material with investigation of Ti-6Al-4V gigacycle fatigue behavior.Wright-Patterson AFB OH:Air Force Institute of Technology,2005:50-55.