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Experimental investigation on HCF strength affected by predamage from LCF of a near alpha titanium alloy

Published online by Cambridge University Press:  31 October 2014

Huang Jia ,
Luo Yinyin ,
Shi Duoqi ,
Yang Xiaoguang ,
Yu Huichen  and
Zhao Pengtao
Huang Jia
Affiliation:
School of Energy and Power Engineering, Beihang University, Beijing 100191, China
Luo Yinyin
Affiliation:
Shanghai Electric Power Equipment Co., Ltd., Shanghai Steam Turbine Factory, Shanghai 200240, China
Shi Duoqi*
Affiliation:
School of Energy and Power Engineering, Beihang University, Beijing 100191, China
Yang Xiaoguang
Affiliation:
School of Energy and Power Engineering, Beihang University, Beijing 100191, China
Yu Huichen
Affiliation:
Beijing Institute of Aeronautical Materials, Beijing 100095, China
Zhao Pengtao
Affiliation:
Beijing Institute of Aeronautical Materials, Beijing 100095, China
*
a)Address all correspondence to this author. e-mail: shdq@buaa.edu.cn
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Abstract

The feasibility of an accelerated test method on revealing the high cycle fatigue (HCF) limit stresses of a near alpha titanium alloy was successfully verified firstly during the rotary bending tests. The stress-controlled low cycle fatigue (LCF) tests at room temperature were then carried out over a range of maximum stresses and stress ratios to reveal the basic LCF strength. Finally, the core emphasis was focused on the influences of the predamage from LCF loadings on the subsequent HCF limit stresses corresponding to the life of 106 cycles. A total of eight levels of predamage from LCF with different stress levels, stress ratios, and proportions of LCF life were introduced, which resulted in obvious deterioration of the HCF stress limits (even under only 2% of expected LCF life). The fracture analysis exhibited that there were typical LCF failure characteristics in crack initiation regions of specimens under prior LCF loadings.

Keywords

titanium alloypredamagefatiguemicrostructurefracture
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 22 , 28 November 2014 , pp. 2748 - 2755
Copyright
Copyright © Materials Research Society 2014 

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References

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