Fatigue crack initiation in as forged Ti-6Al-4V bars with macrozones present

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Abstract

Macrozones are regions containing grains with similar orientations, which in titanium alloys are detrimental to the fatigue properties. In this study, an investigation regarding the effect of the macrozone characteristics on the crack initiation under four-point bending fatigue cycling tests on an as-forged Ti–6Al–4V bar with macrozones present has been carried out. The macrozone characteristics studied in this paper include the Schmid factors of grains within the macrozone, the misorientation between two macrozones or a macrozone and its adjacent area and the angle of the interface versus loading axis. In this study, fatigue crack was initiated within two adjacent macrozones or within a macrozone and its adjacent region with high Schmid factors. Misorientation crack factors are introduced to combine all the above influencing factors and crack initiation on the interface. Fatigue crack initiation mechanism around macrozones has been studied and discussed. The texture index is introduced as a single value to represent the sharpness of the microtexture of a macrozone.
Original languageEnglish
Pages (from-to)288 - 297
Number of pages10
JournalInternational Journal of Fatigue
Volume80
DOIs
Publication statusPublished - 2015

Cite this

@article{81a599ff981140c9a0331c3f9e4c119c,
title = "Fatigue crack initiation in as forged Ti-6Al-4V bars with macrozones present",
abstract = "Macrozones are regions containing grains with similar orientations, which in titanium alloys are detrimental to the fatigue properties. In this study, an investigation regarding the effect of the macrozone characteristics on the crack initiation under four-point bending fatigue cycling tests on an as-forged Ti–6Al–4V bar with macrozones present has been carried out. The macrozone characteristics studied in this paper include the Schmid factors of grains within the macrozone, the misorientation between two macrozones or a macrozone and its adjacent area and the angle of the interface versus loading axis. In this study, fatigue crack was initiated within two adjacent macrozones or within a macrozone and its adjacent region with high Schmid factors. Misorientation crack factors are introduced to combine all the above influencing factors and crack initiation on the interface. Fatigue crack initiation mechanism around macrozones has been studied and discussed. The texture index is introduced as a single value to represent the sharpness of the microtexture of a macrozone.",
author = "Kai Zhang and Kun Yang and Aijun Huang and Xinhua Wu and Davies, {Chris Huw John}",
year = "2015",
doi = "10.1016/j.ijfatigue.2015.05.020",
language = "English",
volume = "80",
pages = "288 -- 297",
journal = "International Journal of Fatigue",
issn = "0142-1123",
publisher = "Elsevier",

}

Fatigue crack initiation in as forged Ti-6Al-4V bars with macrozones present. / Zhang, Kai; Yang, Kun; Huang, Aijun; Wu, Xinhua; Davies, Chris Huw John.

In: International Journal of Fatigue, Vol. 80, 2015, p. 288 - 297.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Fatigue crack initiation in as forged Ti-6Al-4V bars with macrozones present

AU - Zhang, Kai

AU - Yang, Kun

AU - Huang, Aijun

AU - Wu, Xinhua

AU - Davies, Chris Huw John

PY - 2015

Y1 - 2015

N2 - Macrozones are regions containing grains with similar orientations, which in titanium alloys are detrimental to the fatigue properties. In this study, an investigation regarding the effect of the macrozone characteristics on the crack initiation under four-point bending fatigue cycling tests on an as-forged Ti–6Al–4V bar with macrozones present has been carried out. The macrozone characteristics studied in this paper include the Schmid factors of grains within the macrozone, the misorientation between two macrozones or a macrozone and its adjacent area and the angle of the interface versus loading axis. In this study, fatigue crack was initiated within two adjacent macrozones or within a macrozone and its adjacent region with high Schmid factors. Misorientation crack factors are introduced to combine all the above influencing factors and crack initiation on the interface. Fatigue crack initiation mechanism around macrozones has been studied and discussed. The texture index is introduced as a single value to represent the sharpness of the microtexture of a macrozone.

AB - Macrozones are regions containing grains with similar orientations, which in titanium alloys are detrimental to the fatigue properties. In this study, an investigation regarding the effect of the macrozone characteristics on the crack initiation under four-point bending fatigue cycling tests on an as-forged Ti–6Al–4V bar with macrozones present has been carried out. The macrozone characteristics studied in this paper include the Schmid factors of grains within the macrozone, the misorientation between two macrozones or a macrozone and its adjacent area and the angle of the interface versus loading axis. In this study, fatigue crack was initiated within two adjacent macrozones or within a macrozone and its adjacent region with high Schmid factors. Misorientation crack factors are introduced to combine all the above influencing factors and crack initiation on the interface. Fatigue crack initiation mechanism around macrozones has been studied and discussed. The texture index is introduced as a single value to represent the sharpness of the microtexture of a macrozone.

U2 - 10.1016/j.ijfatigue.2015.05.020

DO - 10.1016/j.ijfatigue.2015.05.020

M3 - Article

VL - 80

SP - 288

EP - 297

JO - International Journal of Fatigue

JF - International Journal of Fatigue

SN - 0142-1123

ER -