Degradation of titanium 6Al–4V fatigue strength due to electrical discharge machining

Mower, Todd M.

doi:10.1016/j.ijfatigue.2014.02.018

Cited by 67 publications

(30 citation statements)

References 24 publications

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“…[13,30]. The presence of surface defects and micro-cracks significantly reduced the strength of implant, fatigue performance, as reported previously by Mover et al [18] and Chen et al [30]. moreover, the micro-cracks facilitates corrosion propagation and reduce the corrosion resistance and results in clinical failure, as reported previously by Ntasi et al [19].…”

Section: Resultssupporting

confidence: 68%

“…As a result, the material gets thermally affected and a number of surface defects like high surface roughness, high surface crack density, and macro size pit/dimples were formed on the machined surface which deteriorates the surface quality [17]. The poor surface quality degraded the corrosion performance [18], and fatigue performance [19] of implant and as a result bone-implant interface failure.…”

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confidence: 99%

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Experimental investigations in powder mixed electric discharge machining of Ti–35Nb–7Ta–5Zrβ-titanium alloy

Prakash

Kansal

Pabla

et al. 2016

Materials and Manufacturing Processes

182

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The present research is the first type of study, in which the application of powder mixed electrical discharge machining (PM-EDM) for the machining of β-phase titanium (β-Ti) alloy has been proposed. β-Ti alloys are new range of titanium alloys, which has wide spread application in dental, orthopaedics, shape memory, and stents. The aim of the present study is to fabricate submicro-and nano scale topography by PMEDM process to enhance the biocompatibility without affecting machining efficiency. The effect of Si powder concentration along with pulse-current and duration on the surface and machining characteristics has been investigated. A significant decrease in surface crack density on the machined surface with 4 g/l Si powder concentration was observed. When β-Ti alloy was modified at 15 A pulse-current, longer pulse interval with 8 g/l concentration of Si powder particles, the interconnected surface porosities with pore size 200-500 nm was observed. Moreover, at Si powder concentration of 2 and 4 g/l, the recast layer thickness is 8µm and 2-3 µm, respectively. Elemental mapping analysis confirmed that PMEDM also generated carbides and oxides enriched surface, a favourable surface chemistry to enhance the biocompatibility of β-Ti alloy. Furthermore, Downloaded by [George Mason University] at 06:41 22 June 2016 2 PMEDM also enhances the machining performance by improving MRR and reducing TWR.

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Section: Resultssupporting

confidence: 68%

mentioning

confidence: 99%

Experimental investigations in powder mixed electric discharge machining of Ti–35Nb–7Ta–5Zrβ-titanium alloy

Prakash

Kansal

Pabla

et al. 2016

Materials and Manufacturing Processes

182

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“…During this time, manufacturers applied technological improvements to their machines [22]. This is congruent with the conclusions obtained in [23] for Ti-6Al-4V alloy.…”

Section: Resultssupporting

confidence: 78%

WEDM Manufacturing Method for Noncircular Gears, Using CAD/CAM Software

García-Hernández¹,

Gella-Marín²,

Talón³

et al. 2016

SV-JME

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Noncircular gears are used in several technological applications in order to enhance the performance of different mechanical instruments (flow meters, bikes, internal combustion engines, etc.)• The mathematical models for manufacturing elliptical and oval gears are included.• The algorithm of the mathematical models is implemented using MatlabTM.• Simulations are carried out, and the method is implemented in a real WEDM machine.• Two pairs of elliptical and oval gears are obtained applying this method.

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“…Surely, this would lead to a reduction of the fatigue life under cylic loads. In this regard, MOWER found a correlation between the thickness as well as the roughness of recast layers created when the melted surface solidifies after wire EDM and the resulting fatigue strength degradation [26]. Thus, KLOCKE ET AL.…”

Section: Wire Electrical Discharge Machiningmentioning

confidence: 94%

Investigation of the surface integrity and fatigue strength of Inconel718 after wire EDM and machine hammer peening

et al. 2015

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Highly stressed turbine blades made of Inconel718 (DIN NiCr19NbMo (2.4668); ASTM B637; UNS N07718) have to satisfy stringent requirements regarding durability and reliability. The impact of surface integrity on the fatigue strength of the workpiece material has proven to be of significant importance. An optimization of the surface integrity after wire EDM of Inconel718 can be achieved using the surface finishing process machine hammer peening. Machine hammer peening is an incremental forming process which has the potential to induce residual compressive stresses and strain hardening while smoothing surface asperities. As the effect of machine hammer peening on surface integrity has not yet been completely investigated, this paper deals with its description and modeling of the unknown impact of machine hammer peening on the fatigue strength of Inconel718. Wire EDM and machine hammer peening parameters maximizing the fatigue strength are presented. Experimental measurements are performed to quantify the surface integrity, especially surface roughness, compressive residual stresses and strain hardening, after wire EDM and subsequent machine hammer peening. The evaluation of the effect of surface integrity on the fatigue strength is carried out using a bending fatigue strength testing machine. Additionally, a finite element model is developed to analyze the surface integrity under load and to reveal the effects of difficult-to-measure properties on the fatigue strength. Based on the new knowledge gained during this work, a model to predict the fatigue strength using similitude theory is presented. Along with the previously analyzed correlations between surface integrity and fatigue strength, this allows a constructive setting of machine hammer peening parameters. Thereby, a significant new contribution to knowledge about the influence of machine hammer peening on surface integrity and fatigue strength of Inconel718 is made. The presented approach can be easily transferred to other materials and workpiece geometries

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Degradation of titanium 6Al–4V fatigue strength due to electrical discharge machining

Cited by 67 publications

References 24 publications

Experimental investigations in powder mixed electric discharge machining of Ti–35Nb–7Ta–5Zrβ-titanium alloy

Experimental investigations in powder mixed electric discharge machining of Ti–35Nb–7Ta–5Zrβ-titanium alloy

WEDM Manufacturing Method for Noncircular Gears, Using CAD/CAM Software

Investigation of the surface integrity and fatigue strength of Inconel718 after wire EDM and machine hammer peening

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