An investigation into cutting fluid additives performance during machining processing of Ti-6Al-4V

Riahi

2021

Lubricants

Self Cite

The introduction of additives enhances the friction and wear reduction properties of cutting fluids (CFs) as well as aids in improving the surface quality of the machined parts. This study examines the tribological behavior of polymer-based and phosphorus-based additives introduced into cutting fluids for the machining of Al-Mn alloys. Ball-on-disc tests were used to evaluate the coefficient of friction (COF) and lubrication failure temperature to study the performance of the additives in the cutting fluids. Surface characterization was performed on the sliding tracks induced on the Al-Mn disc surfaces and used to propose the wear and friction reduction mechanisms. The polymer-based additive possessed a higher temperature at which lubrication failure occurred, displayed comparable COF at a lower temperature under certain conditions, and possessed a steadier tribological behavior. However, the phosphorus-based additive was observed to display lower COF and wear damage from 200 °C till failure. The lower COF values for the phosphorus-based additive at 200 °C corresponded with lower surface damage on the Al-Mn surface. The phosphorus-based additive’s performance at 200 °C could be attributed to the forming of a phosphorus-rich boundary layer within the sliding wear track, resulting in less surface damage on the Al-Mn surface and lower material transfer to the counterface steel ball surface.

Section: Discussionsupporting

confidence: 89%

“…A previous study [18] explored the drilling performance of polymer-based and phosphorus-based additives in cutting fluids during drilling on a titanium alloy. The performances of the additives were attributed to the formation of carbon-rich tribolayers and phosphorus-rich tribolayers on the flank surfaces for the respective additives.…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of the Tribological Behavior of Cutting Fluid Additives on Aluminum-Manganese Alloys

Riahi

2021

Lubricants

Self Cite

“…These results would be in line with previous drilling examination of these additives. 17 Lower torque values were observed with the phosphorusbased additive compared with those with the polymerbased additive under high feed rate/low spindle speed drilling conditions. However, under low feed rate/high spindle speed drilling conditions, the polymer-based additive possessed lower torque values.…”

Section: Discussionmentioning

confidence: 90%

“…The performance of the cutting fluid additives was attributed to the formation of carbon-rich and phosphorus-rich tribolayers on the flank surface. 17,18 As the performance of the cutting fluid additives in relation to one another is reliant on the drilling conditions employed, a better understanding of the parameters that influence the tribological behaviour of these additives is still required. This study was carried out to obtain an improved understanding of the polymerbased and phosphorus-based additives' tribological behaviour in relation to the drilling condition employed.…”

Section: Introductionmentioning

confidence: 99%

“…However, the polymer‐based additive possessed a higher lubrication failure temperature than the phosphorus‐based additive. The performance of the cutting fluid additives was attributed to the formation of carbon‐rich and phosphorus‐rich tribolayers on the flank surface 17,18 . As the performance of the cutting fluid additives in relation to one another is reliant on the drilling conditions employed, a better understanding of the parameters that influence the tribological behaviour of these additives is still required.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An investigation into the tribological behaviour of cutting fluid additives on Ti‐6Al‐4V alloy

Riahi

2022

Lubrication Science

Self Cite

The performance of polymer-based and phosphorus-based cutting fluid additives have been shown to depend on the machining conditions employed. This study investigated the tribological behaviour behind the previously reported machining performance of polymer-based and phosphorus-based additives on Ti-6Al-4V using ball-on-disc tests. The coefficient of friction (COF) was evaluated using ball-on-disc tests, surface characterisation was performed on the Ti-6Al-4V and steel ball counterfaces to investigate the wear and friction reduction mechanisms. The tribological performance of the phosphorus-based additive was observed to be influenced by the applied load and temperature. The activation of this additive resulted in a reduction in COF at elevated temperatures. However, the activation temperature was observed to be influenced by the applied load. The COF associated with the polymer-based additive was noted to increase as the temperature increased, regardless of the applied load. The formation of tribolayers from the additives was related to the COF behaviour as well as the surface damage on Ti-6Al-4V and lower material transfer to the steel counterfaces.

The Influence of Polymeric Ester-Type Additives on the Performance of Metal Cutting Fluids for Machining of Titanium Alloy

Mohammadi

J. of Materi Eng and Perform

et al. 2021

The introduction of additives to metal working fluid (MWF) compositions helps to reduce friction and wear while holding the possibility of sustainability to the environment. This study was performed to examine polymeric ester additives' influence on the MWFs performance during the drilling of a titanium alloy, Ti-6Al-4V, under a constant removal rate (MRR) of 4.2 mm 3 /s. The specific cutting energy (SCE) and build-up edge (BUE) were evaluated to assess the additives' performance in the MWFs. It was observed that the drilling performance of the polymeric ester additives was dependent on the drilling conditions employed. The high polarity polyester additive with high molecular weight displayed enhanced drilling performance under the drilling conditions with cutting speeds of 0.105, 0.188, and 0.293 m/s, and respective feed rates of 0.040 mm/r, 0.022 mm/r, and 0.014 mm/r. This enhanced drilling condition was reflected in the SCE with the high polarity polyester additive possessing lower values than the low-molecular-weight polymeric ester by 32, 27, and 35%, and the high-molecular-weight polymer ester by 17, 6, and 18% at each of the respective drilling conditions. The high-molecular-weight polymer ester was a more suitable additive under the drilling condition with a cutting speed of 0.419 m/s and feed rate of 0.01 mm/r, boasting a 27 and 24% improvement in SCE compared with the high polarity polyester and low-molecular-weight polymeric ester, respectively. The polymeric ester additives' performance could be attributed to the formation of a carbonrich boundary layer on the cutting blade and the presence of oxygen and carbon in the BUE on the cutting edges.