Analysis of tool wear in cryogenic machining of additive manufactured Ti6Al4V alloy

Bordin, Alberto; Bruschi, Stefania; Ghiotti, Andrea; Bariani, Paolo Francesco

doi:10.1016/j.wear.2015.01.030

Cited by 187 publications

(67 citation statements)

References 25 publications

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“…The maintenance of the gaseous N2 at the desired temperature during the whole test is guaranteed by a retroactive temperature control making use of an internal PLC controller. In this work a testing temperature of -100°C was considered, the output coolant pressure was fixed constant at 2.5 bars, and the cutting zone was cooled with one nozzle with an internal diameter of 6 mm directed onto the tool rake face [11].…”

Section: Machining Testsmentioning

confidence: 99%

Enhancement of corrosion resistance to sterilization stages of a biomedical grade AISI 316L stainless steel by means of low-temperature machining

Bertolini

Bruschi

Ghiotti

2019

Materials Today: Proceedings

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Austenitic stainless steels are currently used for the manufacture of reusable medical instruments, thanks to their combination of elevated strength, corrosion resistance, biocompatibility and low cost. However, during their service life, they are subjected to repeated sterilization cycles, which lead to the loosening of the surface oxide stability and, as a consequence, the decrease of their durability. In the present study, the in-service corrosion behaviour of the AISI 316L stainless steel was investigated after being machined using two low-temperature coolants, namely Liquid Nitrogen (LN2) and gaseous Nitrogen (N2) cooled by LN2 to -100°C, as well as using a conventional cutting fluid. Results showed that the AISI 316L microstructure near the machined surface was significantly affected by the machining cooling strategies with the generation of a hardened and more compressed layer when low-temperature coolants were used. Such surface integrity enhancements contributed to improve both the general and localized corrosion resistance to sterilization stages. From this basis, machining using low temperature coolants can be considered a suitable technique to manufacture medical devices of increased durability.

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Section: Machining Testsmentioning

confidence: 99%

Enhancement of corrosion resistance to sterilization stages of a biomedical grade AISI 316L stainless steel by means of low-temperature machining

Bertolini

Bruschi

Ghiotti

2019

Materials Today: Proceedings

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“…Poor thermal conductivity of titanium alloys combined with their high chemical reactivity leads to high wear rate of cutting tools [13][14][15]. Only very few papers discussing the machinability of additive manufactured titanium alloys are available [16][17][18][19][20][21][22]. Oyelola et al [16] investigated the machining behaviour and surface integrity of Ti-6Al-4V components produced by direct metal deposition additive manufacturing technology.…”

Section: Journal Of Metallurgymentioning

confidence: 99%

“…Bordin et al [20] compared the machinability of wrought and electron beam melted Ti-6Al-4V during semifinish turning. Also recently, Bordin et al [21] evaluated the tool wear mechanisms arising when semifinish turning EBM Ti-6Al-4V under dry and cryogenic conditions in an attempt to improve the machinability of additive manufactured components. Brinksmeier et al [19] analysed the surface integrity of selective laser melting fabricated and subsequently machined Ti-6Al-4V samples.…”

Section: Journal Of Metallurgymentioning

confidence: 99%

Metallurgical and Machinability Characteristics of Wrought and Selective Laser Melted Ti-6Al-4V

Shunmugavel

Polishetty

Nomani

et al. 2016

Journal of Metallurgy

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This research work presents a machinability study between wrought grade titanium and selective laser melted (SLM) titanium Ti6Al-4V in a face turning operation, machined at cutting speeds between 60 and 180 m/min. Machinability characteristics such as tool wear, cutting forces, and machined surface quality were investigated. Coating delamination, adhesion, abrasion, attrition, and chipping wear mechanisms were dominant during machining of SLM Ti-6Al-4V. Maximum flank wear was found higher in machining SLM Ti-6Al-4V compared to wrought Ti-6Al-4V at all speeds. It was also found that high machining speeds lead to catastrophic failure of the cutting tool during machining of SLM Ti-6Al-4V. Cutting force was higher in machining SLM Ti-6Al-4V as compared to wrought Ti-6Al-4V for all cutting speeds due to its higher strength and hardness. Surface finish improved with the cutting speed despite the high tool wear observed at high machining speeds. Overall, machinability of SLM Ti-6Al-4V was found poor as compared to the wrought alloy.

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“…As opposed to this technique, cryogenicassisted machining consists of cooling the tool/chip interface with a liquefied gas such as liquid nitrogen and CO 2 . The use of this technique has been effective in limiting adhesive wear, improving surface roughness and increasing tool life [14][15][16]. Recent studies [17,18] showed a great improvement in surface integrity when machining Ti-6Al-4V titanium alloy.…”

Section: Introductionmentioning

confidence: 99%

High-pressure water-jet-assisted machining of Ti555-3 titanium alloy: investigation of tool wear mechanisms

Ayed

Germain

2018

Int J Adv Manuf Technol

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The main objective of this study is to investigate uncoated tungsten carbide tool wear mechanisms for high-pressure waterjet machining of the Ti555-3 titanium alloy. A comparative study has been undertaken (i.e. conventional versus assisted machining) based on numerous experimental tests. These tests have been accompanied by the measurement of the cutting forces and flank wear. It is concluded that the high-pressure water-jet assistance can greatly increase tool life compared to conventional machining, for all cutting conditions. The gain in tool life depends on the severity of the cutting condition. The analyses performed for each test (i.e. SEM, EDS and 3D profilometer) made it possible to monitor the tool wear and to investigate the main wear mechanisms. Based on these analyses, adhesion wear appears to be the most influential mechanism and it is accelerated by an increase in water-jet pressure. Monitoring of the wear profile made it possible to study the evolution of crater wear and material chipping during machining.

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Analysis of tool wear in cryogenic machining of additive manufactured Ti6Al4V alloy

Cited by 187 publications

References 25 publications

Enhancement of corrosion resistance to sterilization stages of a biomedical grade AISI 316L stainless steel by means of low-temperature machining

Enhancement of corrosion resistance to sterilization stages of a biomedical grade AISI 316L stainless steel by means of low-temperature machining

Metallurgical and Machinability Characteristics of Wrought and Selective Laser Melted Ti-6Al-4V

High-pressure water-jet-assisted machining of Ti555-3 titanium alloy: investigation of tool wear mechanisms

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