The effects of machined topography on fatigue life of a nickel based superalloy

D. T. Ardi; Y. G. Li; Hing Kai Chan; L. Blunt; M. R. Bache

doi:10.1016/j.procir.2014.04.004

The effects of machined topography on fatigue life of a nickel based superalloy

D. T. Ardi, Y. G. Li, Hing Kai Chan, L. Blunt, M. R. Bache

Research output: Contribution to journal › Conference article › peer-review

14 Citations (Scopus)

Abstract

The surface topography of engineering components is known to affect fatigue behaviour. However, defining topography based on the average roughness (R _a) parameter is considered to be inadequate when correlating to fatigue performance. Alternative correlations utilising areal topographic parameters would therefore be valuable. This has been addressed through areal topographic measurements and fatigue testing of an advanced nickel based superalloy, Alloy720Li. Low cycle and high cycle fatigue tests were performed at ambient temperature on specimens manufactured via different turning parameters to obtain S-N curves for different finishes. Supporting fractography is presented to emphasise the role of surface topography on fatigue crack initiation. The effects of different turned surface finishes on fatigue crack initiation are demonstrated and discussed.

Original language	English
Pages (from-to)	19-24
Number of pages	6
Journal	Procedia CIRP
Volume	13
Early online date	21 May 2014
DOIs	https://doi.org/10.1016/j.procir.2014.04.004
Publication status	Published - 21 May 2014
Event	2nd CIRP Conference on Surface Integrity - Nottingham, United Kingdom Duration: 28 May 2014 → 30 May 2014 Conference number: 2

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title = "The effects of machined topography on fatigue life of a nickel based superalloy",

abstract = "The surface topography of engineering components is known to affect fatigue behaviour. However, defining topography based on the average roughness (R a) parameter is considered to be inadequate when correlating to fatigue performance. Alternative correlations utilising areal topographic parameters would therefore be valuable. This has been addressed through areal topographic measurements and fatigue testing of an advanced nickel based superalloy, Alloy720Li. Low cycle and high cycle fatigue tests were performed at ambient temperature on specimens manufactured via different turning parameters to obtain S-N curves for different finishes. Supporting fractography is presented to emphasise the role of surface topography on fatigue crack initiation. The effects of different turned surface finishes on fatigue crack initiation are demonstrated and discussed.",

keywords = "Areal surface characterisation, Fatigue, Nickel based superalloy, Surface topography, Turned surface",

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T1 - The effects of machined topography on fatigue life of a nickel based superalloy

AU - Ardi, D. T.

AU - Li, Y. G.

AU - Chan, Hing Kai

AU - Blunt, L.

AU - Bache, M. R.

N1 - Conference code: 2

PY - 2014/5/21

Y1 - 2014/5/21

N2 - The surface topography of engineering components is known to affect fatigue behaviour. However, defining topography based on the average roughness (R a) parameter is considered to be inadequate when correlating to fatigue performance. Alternative correlations utilising areal topographic parameters would therefore be valuable. This has been addressed through areal topographic measurements and fatigue testing of an advanced nickel based superalloy, Alloy720Li. Low cycle and high cycle fatigue tests were performed at ambient temperature on specimens manufactured via different turning parameters to obtain S-N curves for different finishes. Supporting fractography is presented to emphasise the role of surface topography on fatigue crack initiation. The effects of different turned surface finishes on fatigue crack initiation are demonstrated and discussed.

AB - The surface topography of engineering components is known to affect fatigue behaviour. However, defining topography based on the average roughness (R a) parameter is considered to be inadequate when correlating to fatigue performance. Alternative correlations utilising areal topographic parameters would therefore be valuable. This has been addressed through areal topographic measurements and fatigue testing of an advanced nickel based superalloy, Alloy720Li. Low cycle and high cycle fatigue tests were performed at ambient temperature on specimens manufactured via different turning parameters to obtain S-N curves for different finishes. Supporting fractography is presented to emphasise the role of surface topography on fatigue crack initiation. The effects of different turned surface finishes on fatigue crack initiation are demonstrated and discussed.

KW - Areal surface characterisation

KW - Fatigue

KW - Nickel based superalloy

KW - Surface topography

KW - Turned surface

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The effects of machined topography on fatigue life of a nickel based superalloy

Abstract

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