Surface integrity of nickel-based alloys subjected to severe plastic deformation by abusive drilling

M’Saoubi, Rachid; Axinte, Dragoş; Herbert, C.R.J.; Hardy, Mark; Salmon, P.

doi:10.1016/j.cirp.2014.03.067

Cited by 66 publications

(27 citation statements)

References 12 publications

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“…Fig. 21 displays nanohardness distributions obtained under machined surfaces produced by abusive drilling in four different Ni based alloys [148]. A much higher increase in near surface nanohardness was observed for RR1000 and Alloy 720Li when compared to Alloy 718 and Waspaloy.…”

Section: Composite Materialsmentioning

confidence: 96%

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High performance cutting of advanced aerospace alloys and composite materials

M’Saoubi¹,

et al. 2015

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Section: Composite Materialsmentioning

confidence: 96%

“…drilled without coolant) situation that resulted in different magnitudes of severe plastic deformation zones [148] (Fig. 13a-d).…”

Section: Ni-based Superalloysmentioning

confidence: 97%

High performance cutting of advanced aerospace alloys and composite materials

M’Saoubi¹,

et al. 2015

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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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“…In regions of the material where a threshold strain for recrystallization is achieved, the recrystallized grain size is determined according to an empirical relationship relating initial grain size, the Zener-Hollomon parameter, and material constants. This approach has been utilized by a number of authors, including Caruso et al [43] for AISI 52100, Pu et al [179] for MgAZ31B, Rotella and Umbrello [188] for Ti-6Al-4V, M'Saoubi et al [150] for advanced nickel based superalloys (Inconel 718, Wasapaloy, Udimet 720 and RR1000), Jafarian et al [119] for Inconel 718, Ambrosy et al [2] for AISI 4140. As an example, the results for Ti-6Al-4V shown in Fig.…”

Section: Microstructure Models For Machiningmentioning

confidence: 99%