The Effects of Machined Topography on Fatigue Life of a Nickel based Superalloy

Ardi, Dennise Tanoko; Li, Y.G.; Chan, Kelvin; Blunt, Liam; Bache, M.R.

doi:10.1016/j.procir.2014.04.004

Cited by 16 publications

(9 citation statements)

References 4 publications

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“…Metodologię określania wpływu chropowatości powierzchni na wytrzymałość/trwałość zmęczeniową, opartą na empirycznej metodzie oceny wpływu mikrokarbów, zweryfikowano dla stali stopowej AISI 4130 CR [10,12], dwufazowego stopu tytanu Ti-6Al-4V [15], stopu aluminium 7010--T7451 [18], stopu aluminium A357 wytwarzanego metodą (SLM) [17], superstopu na osnowie z niklu Alloy 720Li [16] oraz laminatu wzmocnionego włóknami grafitowymi [13].…”

Section: Określenie Wpływu Mikrokarbów Powierzchniowych Na Trwałość Zmęczeniowąunclassified

Influence of surface roughness on fatigue life of machine elements – the development in experimental investigations and simulations

Grzesik

2019

Mechanik

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In this paper fundamental information on the influence of surface roughness on fatigue life/limit stresses of machine elements made of different construction materials using different machining/manufacturing processes are presented. The rules for the assessment of surface finish influence represented by the set of microscopic notches on the real machined surfaces, which allow the determination of the stress concentration factor and the correction of a fatigue life limit, are provided. The results of fatigue tests are compared with computed data and predictions using FEM based simulations. The effect of surface discontinues resulting from surface roughness are related to machine elements made of steels, aluminium alloys, aerospace alloys – titanium and nickel based superalloys and composite reinforced by graphite fibres.

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Section: Określenie Wpływu Mikrokarbów Powierzchniowych Na Trwałość Zmęczeniowąunclassified

Influence of surface roughness on fatigue life of machine elements – the development in experimental investigations and simulations

Grzesik

2019

Mechanik

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“…Nickel base superalloy is difficult to machine, in addition to the material itself unique heat induced pore structure outside [2][3][4]. Its material composition is show in Table 1.…”

Section: Milling Testmentioning

confidence: 99%

The Relationship between Milling Surface Morphology and Corrosion Rate of Nickel Base Superalloy

Shi

Qiao

Guo

2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

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Through the milling of nickel base superalloy, this paper studies the effect regularity of surface morphology on corrosion resistance of nickel base superalloy under the condition of different milling parameters. In order to be more intuitive to characterize the surface morphology, this paper defines Motif area ratio to characterize the surface topography. It is defined as the ratio of the surface area that can meet the threshold condition to the machined surface. Take surface roughness for an example to study the relationship between the surface roughness and the corrosion rate of workpiece. Experiment shows that the workpiece surface topography is the direct reason of the difference of corrosion resistance of workpiece material. The better surface morphology, the lower workpiece average corrosion rate and the worse surface morphology, the rapider average corrosion rate.

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“…It is known that the service life of aerospace components depends greatly on the properties of the finished surface layer. Ardi et al studied the effects of surface features on the fatigue life of a nickel‐based superalloy and found that the amplitude and hybrid topographic parameters play a crucial role in crack initiation . Withers demonstrated systematically the effects of the interface residual stress profile on the fatigue failure of components .…”

Section: Introductionmentioning

confidence: 99%

A method of assessing the strength of metal surface using film samples on titanium alloy Ti‐1023

Quan

Chen

Zhu

et al. 2019

Strain

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The fatigue life of aerospace components depends greatly on the mechanical properties of the finished surface layer. However, no independent strength test of this layer has been reported because of the lack of suitable samples. Therefore, a direct method of assessing the surface tensile strength using film samples with thicknesses of approximately 40 μm is proposed in this paper. The immediate objective of this research is to demonstrate the fundamentals of surface strength testing and prove the feasibility of preparing films by tracking the evolution of the surface integrity. The test results show that layer-by-layer grinding and polishing is a feasible method for preparing film samples with sufficient area, controllable thickness, and well-maintained surface integrity.During the preparation of the film samples, the roughness and microhardness of the test side (the side kept unprepared for testing) are protected, and those of the processed side (the side that is ground and polished) are controlled. The residual stress on both sides is released to zero. The film specimens exhibit regular fracture behaviour in the tensile tests, and their stress-strain curves can be explained as weighted averages of the stress-strain functions of multiple layers.

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The Effects of Machined Topography on Fatigue Life of a Nickel based Superalloy

Cited by 16 publications

References 4 publications

Influence of surface roughness on fatigue life of machine elements – the development in experimental investigations and simulations

Influence of surface roughness on fatigue life of machine elements – the development in experimental investigations and simulations

The Relationship between Milling Surface Morphology and Corrosion Rate of Nickel Base Superalloy

A method of assessing the strength of metal surface using film samples on titanium alloy Ti‐1023

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