Fatigue crack growth behavior of beta-annealed Ti-6Al-2Sn-4Zr-xMo (x = 2, 4 and 6) alloys: Influence of microstructure and stress ratio

Jianke Qiu; Xin Feng; Yingjie Ma; Jiafeng Lei; Aijun Huang; David Rugg; Rui Yang

doi:10.1016/j.ijfatigue.2015.10.009

Fatigue crack growth behavior of beta-annealed Ti-6Al-2Sn-4Zr-xMo (x = 2, 4 and 6) alloys: Influence of microstructure and stress ratio

Jianke Qiu, Xin Feng, Yingjie Ma, Jiafeng Lei, Aijun Huang, David Rugg, Rui Yang

Research output: Contribution to journal › Article › Research › peer-review

Abstract

The influence of microstructures (β grain size, α/β colony size and width of α lath) and stress ratios (R = 0.1, 0.7) on fatigue crack growth (FCG) behavior of beta-annealed Ti624x (x = 2, 4 and 6) alloys was investigated. The FCG rate curves, crack paths, and the plastic zone ahead of the crack tip were compared. The reducing FCG resistance from Ti6242 to Ti6246 was found to stem from decreasing α/β colony size. Increasing stress ratio also reduced crack deflection and crack closure, and thus decreased the FCG resistance. The relevant mechanisms were discussed in terms of K_max and crack closure effect.

Original language	English
Pages (from-to)	150-160
Number of pages	11
Journal	International Journal of Fatigue
Volume	83
DOIs	https://doi.org/10.1016/j.ijfatigue.2015.10.009
Publication status	Published - 1 Feb 2016
Externally published	Yes

Keywords

Crack closure
Fatigue crack growth
Microstructure
Stress ratio
Ti624x

Cite this

Qiu, J., Feng, X., Ma, Y., Lei, J., Huang, A., Rugg, D., & Yang, R. (2016). Fatigue crack growth behavior of beta-annealed Ti-6Al-2Sn-4Zr-xMo (x = 2, 4 and 6) alloys: Influence of microstructure and stress ratio. International Journal of Fatigue, 83, 150-160. https://doi.org/10.1016/j.ijfatigue.2015.10.009

Qiu, Jianke ; Feng, Xin ; Ma, Yingjie ; Lei, Jiafeng ; Huang, Aijun ; Rugg, David ; Yang, Rui. / Fatigue crack growth behavior of beta-annealed Ti-6Al-2Sn-4Zr-xMo (x = 2, 4 and 6) alloys : Influence of microstructure and stress ratio. In: International Journal of Fatigue. 2016 ; Vol. 83. pp. 150-160.

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title = "Fatigue crack growth behavior of beta-annealed Ti-6Al-2Sn-4Zr-xMo (x = 2, 4 and 6) alloys: Influence of microstructure and stress ratio",

abstract = "The influence of microstructures (β grain size, α/β colony size and width of α lath) and stress ratios (R = 0.1, 0.7) on fatigue crack growth (FCG) behavior of beta-annealed Ti624x (x = 2, 4 and 6) alloys was investigated. The FCG rate curves, crack paths, and the plastic zone ahead of the crack tip were compared. The reducing FCG resistance from Ti6242 to Ti6246 was found to stem from decreasing α/β colony size. Increasing stress ratio also reduced crack deflection and crack closure, and thus decreased the FCG resistance. The relevant mechanisms were discussed in terms of Kmax and crack closure effect.",

keywords = "Crack closure, Fatigue crack growth, Microstructure, Stress ratio, Ti624x",

author = "Jianke Qiu and Xin Feng and Yingjie Ma and Jiafeng Lei and Aijun Huang and David Rugg and Rui Yang",

year = "2016",

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doi = "10.1016/j.ijfatigue.2015.10.009",

language = "English",

volume = "83",

pages = "150--160",

journal = "International Journal of Fatigue",

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Qiu, J, Feng, X, Ma, Y, Lei, J, Huang, A, Rugg, D & Yang, R 2016, 'Fatigue crack growth behavior of beta-annealed Ti-6Al-2Sn-4Zr-xMo (x = 2, 4 and 6) alloys: Influence of microstructure and stress ratio' International Journal of Fatigue, vol. 83, pp. 150-160. https://doi.org/10.1016/j.ijfatigue.2015.10.009

Fatigue crack growth behavior of beta-annealed Ti-6Al-2Sn-4Zr-xMo (x = 2, 4 and 6) alloys : Influence of microstructure and stress ratio. / Qiu, Jianke; Feng, Xin; Ma, Yingjie; Lei, Jiafeng; Huang, Aijun; Rugg, David; Yang, Rui.

In: International Journal of Fatigue, Vol. 83, 01.02.2016, p. 150-160.

Research output: Contribution to journal › Article › Research › peer-review

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T1 - Fatigue crack growth behavior of beta-annealed Ti-6Al-2Sn-4Zr-xMo (x = 2, 4 and 6) alloys

T2 - Influence of microstructure and stress ratio

AU - Qiu, Jianke

AU - Feng, Xin

AU - Ma, Yingjie

AU - Lei, Jiafeng

AU - Huang, Aijun

AU - Rugg, David

AU - Yang, Rui

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AB - The influence of microstructures (β grain size, α/β colony size and width of α lath) and stress ratios (R = 0.1, 0.7) on fatigue crack growth (FCG) behavior of beta-annealed Ti624x (x = 2, 4 and 6) alloys was investigated. The FCG rate curves, crack paths, and the plastic zone ahead of the crack tip were compared. The reducing FCG resistance from Ti6242 to Ti6246 was found to stem from decreasing α/β colony size. Increasing stress ratio also reduced crack deflection and crack closure, and thus decreased the FCG resistance. The relevant mechanisms were discussed in terms of Kmax and crack closure effect.

KW - Crack closure

KW - Fatigue crack growth

KW - Microstructure

KW - Stress ratio

KW - Ti624x

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