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

Research output: Contribution to journalArticle

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 languageEnglish
Article number105949
Number of pages13
JournalInternational Journal of Fatigue
Volume142
Early online date18 Sep 2020
DOIs
Publication statusE-pub ahead of print - 18 Sep 2020

Keywords

  • forging
  • low cycle fatigue
  • machining
  • titanium alloys

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