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 journalArticleResearchpeer-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 Kmax and crack closure effect.

Original languageEnglish
Pages (from-to)150-160
Number of pages11
JournalInternational Journal of Fatigue
Volume83
DOIs
Publication statusPublished - 1 Feb 2016
Externally publishedYes

Keywords

  • Crack closure
  • Fatigue crack growth
  • Microstructure
  • Stress ratio
  • Ti624x

Cite this

@article{d991b362cfed47d791acbd4e33657e91,
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",
month = "2",
day = "1",
doi = "10.1016/j.ijfatigue.2015.10.009",
language = "English",
volume = "83",
pages = "150--160",
journal = "International Journal of Fatigue",
issn = "0142-1123",
publisher = "Elsevier",

}

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 journalArticleResearchpeer-review

TY - JOUR

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

PY - 2016/2/1

Y1 - 2016/2/1

N2 - 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.

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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U2 - 10.1016/j.ijfatigue.2015.10.009

DO - 10.1016/j.ijfatigue.2015.10.009

M3 - Article

VL - 83

SP - 150

EP - 160

JO - International Journal of Fatigue

JF - International Journal of Fatigue

SN - 0142-1123

ER -