The effect of forging texture and machining parameters on the fatigue performance of titanium alloy disc components

Daniel Suárez Fernández; B. P. Wynne; P. Crawforth; K. Fox; M. Jackson

doi:10.1016/j.ijfatigue.2020.105949

The effect of forging texture and machining parameters on the fatigue performance of titanium alloy disc components

Daniel Suárez Fernández, B. P. Wynne, P. Crawforth, K. Fox, M. Jackson

Mechanical And Aerospace Engineering

Research output: Contribution to journal › Article

Abstract

The Mechanisms of fatigue failure in Ti-6Al-2Sn-4Zr-6Mo forged discs are investigated: the effects of forging and machining operations on fatigue are decoupled. A four-point bend fatigue testing approach enabled the crack initiation and propagation characteristics to be studied at multiple locations around the disc periphery. Fatigue performance variation (of ~60%) at different positions, and crack initiation and propagation behaviour were linked to the heterogeneous crystallographic texture - developed during upstream forging. Downstream machining processes were found to increase fatigue life, regardless of the cutting speed. However, circumferential fatigue heterogeneity, inherent from the forging stage was still evident even after machining.

Original language	English
Article number	105949
Number of pages	13
Journal	International Journal of Fatigue
Volume	142
Early online date	18 Sep 2020
DOIs	https://doi.org/10.1016/j.ijfatigue.2020.105949
Publication status	E-pub ahead of print - 18 Sep 2020

Keywords

forging
low cycle fatigue
machining
titanium alloys

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10.1016/j.ijfatigue.2020.105949

Suarez-Fernandez-etal-IJF-2020-The-effect-of-forging-texture-and-machining-parametersFinal published version, 17.9 MBLicence: CC BY 4.0

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Suárez Fernández, D., Wynne, B. P., Crawforth, P., Fox, K., & Jackson, M. (2021). The effect of forging texture and machining parameters on the fatigue performance of titanium alloy disc components. International Journal of Fatigue, 142, [105949]. https://doi.org/10.1016/j.ijfatigue.2020.105949

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abstract = "The Mechanisms of fatigue failure in Ti-6Al-2Sn-4Zr-6Mo forged discs are investigated: the effects of forging and machining operations on fatigue are decoupled. A four-point bend fatigue testing approach enabled the crack initiation and propagation characteristics to be studied at multiple locations around the disc periphery. Fatigue performance variation (of ~60%) at different positions, and crack initiation and propagation behaviour were linked to the heterogeneous crystallographic texture - developed during upstream forging. Downstream machining processes were found to increase fatigue life, regardless of the cutting speed. However, circumferential fatigue heterogeneity, inherent from the forging stage was still evident even after machining.",

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