Analysis of residual stress and work-hardened profiles on Inconel 718 when face turning with large-nose radius tools

Madariaga, A.; Esnaola, J.A.; Fernandez, E.; Arrazola, P.J.; Garay, A.; Morel, Franck

doi:10.1007/s00170-013-5585-6

Cited by 53 publications

(23 citation statements)

References 25 publications

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“…The rate of dislocation or hardening increases with an increase in the chord width. Several studies have used the chord width to characterise the state of hardening in the surface, on peening for example in Hoffmeister et al [15] or during machining in Madariaga et al [16].…”

Section: Methodsmentioning

confidence: 99%

Influence of Milling on the Fatigue Lifetime of a Ti6Al4V Titanium Alloy

Moussaoui

Mousseigne

Senatore

et al. 2015

Metals

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The present article focuses on the influence of machining on the fatigue life of a titanium alloy: Ti6Al4V. An experimental design was adopted in order to highlight the effects of machining parameters on surface integrity while generating very different surfaces with a view to subsequent fatigue testing (four point bending tests). Firstly, the impact of machining parameters on surface integrity was demonstrated. Then, the influence of surface integrity on fatigue lifetime was observed: no influence of the geometric and metallurgical parameters was observed. However, the mechanical parameter (e.g., residual stress) seemed to have a preponderant influence. To conclude, a machining plan of procedure was proposed to significantly improve the fatigue lifetime as compared with a reference industrial plan of procedure.

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Section: Methodsmentioning

confidence: 99%

Influence of Milling on the Fatigue Lifetime of a Ti6Al4V Titanium Alloy

Moussaoui

Mousseigne

Senatore

et al. 2015

Metals

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“…Hence, such materials are considered as difficult-to-cut materials. Although the conventional machining methods are employed to deal with these difficult-to-machine materials especially Inconel 718 [25][26][27][28][29]30], in general, the conventional machining processes are found to be uneconomical [31]. Nickel-based superalloys are grouped into this class of difficult-to-machine materials.…”

Section: Machining Of Inconel 718mentioning

confidence: 99%

A comparison of laser beam machining of micro-channels under dry and wet mediums

Darwish

Ahmed

Alahmari

et al. 2015

Int J Adv Manuf Technol

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Micro-channels have been fabricated in nickelbased superalloy (Inconel 718) through laser beam machining (LBM). Two machining mediums are employed: dry and wet medium. Under the dry medium, laser beam passes through air prior to strike with target surface while under wet medium, the laser beam first travels through a layer of distilled water and reaches the substrate after. For both the machining environments, effects of laser power, pulse repetition rate, and laser scan speed on machined channels' width, depth, and taperness are investigated. A comparison of parametric effects on machined channels' profiles has been carried out for the said machining conditions. The results reveal that LBM under distilled water is more productive than LBM under air environment. In one step, wet machining conditions allow to generate a set of two microchannels, and dry conditions generate one micro-channel. Further, to achieve the optimum dimensions of micro-channels, the appropriate level of each of the investigated laser parameter is proposed.

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“…However, there are also a number of properties of nickel-based alloy as following, which lead to the poor machinability by mains of cutting [3][4][5][6]: (i) stability of the alloy strength due to its high-temperature characteristics, (ii) severe tool wear during machining process due to the highly sensitive strain rate, (iii) poor thermal conductivity resulting in high cutting temperatures, (iv) diffusion wear caused by high chemical affinity, and (v) greater cutting forces induce vibration, which is harmful to the machined surface quality. The above properties make nickel-based alloy unfavorable to the conventional machining processes, such as cutting and grinding [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Machining characteristics of nickel-based alloy with positive polarity blasting erosion arc machining

Chen

et al. 2015

Int J Adv Manuf Technol

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A nickel-based high-temperature alloy widely used in aerospace engines is a typical difficult-to-cut material by conventional machining processes due to its high-temperature mechanical strength and toughness. Blasting erosion arc machining (BEAM), a new type of electrical discharge machining (EDM) method, is capable of removing such materials with a very high material removal rate and a low tool wear ratio. This paper presents experimental investigations in machining characteristics and machined surface integrity of the nickel-based alloy GH4169 (similar to Inconel718) by positive polarity blasting erosion arc machining (positive BEAM). The test results imply a possibility to improve the surface integrity with positive BEAM compared with a regular negative one. In this work, a three-factor, three-level machining performance experiment was carried out to examine the effects of the machining parameters such as discharge peak current, flushing inlet pressure, and pulse duration on the machining performances of material removal rate, tool wear ratio, and surface roughness. The experimental results show that positive BEAM is capable of greatly improving the machined surface integrity. The surface roughness decreased from 274 μm (under negative polarity BEAM) down to 31 μm (under positive polarity BEAM). Additionally, fewer micro-cracks and a thinner heat-affected zone on the workpiece surface can be observed. It also reveals that by optimizing the combination of the negative and the positive BEAM, favorable machining performances of high material removal rate and finer surface roughness are possible. By utilizing the polarity effects, the machining allowance for the subsequent semi-finishing processes such as cutting can be further reduced.

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Analysis of residual stress and work-hardened profiles on Inconel 718 when face turning with large-nose radius tools

Cited by 53 publications

References 25 publications

Influence of Milling on the Fatigue Lifetime of a Ti6Al4V Titanium Alloy

Influence of Milling on the Fatigue Lifetime of a Ti6Al4V Titanium Alloy

A comparison of laser beam machining of micro-channels under dry and wet mediums

Machining characteristics of nickel-based alloy with positive polarity blasting erosion arc machining

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