Surface topography and the impact on fatigue performance

D. Tardi, Y. Gli, Hing Kai Chan, L. Blunt, M. R. Bache

Research output: Contribution to journalArticle

Abstract

Areal characterization was applied to plain fatigue specimens manufactured from a nickel-based superalloy, Alloy 720Li,to determine the impact of machined/finished surface topographyonfatigue performance of this material. Samples were subjected to fatigue testing in the as-turned and shot peened conditions to study the interaction between residual stresses and topography in influencing the fatigue performance. The turning process was deliberately manipulated to produce three distinct finishes which were subsequently given an identical shot peening, resulting in six grades of surface topography. Surface topography was found toinfluence fatigue eveninthe presence ofpeened compressive residual stresses by promoting crack initiation at valley sites. Both the roughness amplitude and spatial characteristics of the surface were found to be important when correlating to fatigue performance.

LanguageEnglish
Article number015007
JournalSurface Topography: Metrology and Properties
Volume3
Issue number1
DOIs
Publication statusPublished - 1 Jan 2015

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Surface topography
topography
Fatigue of materials
residual stress
Residual stresses
shot peening
Shot peening
Fatigue testing
crack initiation
heat resistant alloys
Nickel
plains
Superalloys
Compressive stress
Crack initiation
Topography
shot
valleys
grade
roughness

Cite this

Tardi, D. ; Gli, Y. ; Chan, Hing Kai ; Blunt, L. ; Bache, M. R. / Surface topography and the impact on fatigue performance. In: Surface Topography: Metrology and Properties. 2015 ; Vol. 3, No. 1.
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Surface topography and the impact on fatigue performance. / Tardi, D.; Gli, Y.; Chan, Hing Kai; Blunt, L.; Bache, M. R.

In: Surface Topography: Metrology and Properties, Vol. 3, No. 1, 015007, 01.01.2015.

Research output: Contribution to journalArticle

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AU - Gli, Y.

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