Abstract
In this paper, an experimental investigation into the machinability of AISI 316 alloy during finishing end milling operation under different cooling conditions and with varying process parameters is presented. Three environmental-friendly cooling strategies were utilized, namely, dry, minimal quantity lubrication (MQL) and MQL with nanoparticles (Al2O3), and the variable process parameters were cutting speed and feed rate. Power consumption and surface quality were utilized as the machining responses to characterize the process performance. Surface quality was examined by evaluating the final surface roughness and surface integrity of the machined surface. The results revealed a reduction in power consumption when MQL and MQL + Al2O3 strategies were applied compared to the dry case by averages of 4.7% and 8.6%, respectively. Besides, a considerable reduction in the surface roughness was noticed with average values of 40% and 44% for MQL and MQL + Al2O3 strategies, respectively, when compared to the dry condition. At the same time, the reduction in generated surface roughness obtained by using MQL + Al2O3 condition was marginal (5.9%) compared with using MQL condition. Moreover, the results showed that the improvement obtained in the surface quality when using MQL and MQL + Al2O3 coolants increased at higher cutting speed and feed rate, and thus, higher productivity can be achieved without deteriorating final surface quality, compared to dry conditions. From scanning electron microscope (SEM) analysis, debris, furrows, plastic deformation irregular friction marks, and bores were found in the surface texture when machining under dry conditions. A slight smoother surface with a nano-polishing effect was found in the case of MQL + Al2O3 compared to the MQL and dry cooling strategies. This proves the effectiveness of lubricant with nanoparticles in reducing the friction and thermal damages on the machined surface as the friction marks were still observed when machining with MQL comparable with the case of MQL + Al2O3.
Highlights
Molybdenum-bearing austenitic stainless steels are types of stainless steel alloys that are more resistant to general corrosion and pitting/crevice corrosion than the conventional 4.0/).chromium-nickel austenitic stainless steels [1]
It was found that machining under dry condition consumed a higher power than the other two cooling conditions while cutting under minimal quantity lubrication (MQL) with nanoparticles gave a lowest power consumption
The decrease in power consumption in MQL and MQL + Al2 O3 compared to dry case was 4.7% and
Summary
Molybdenum-bearing austenitic stainless steels are types of stainless steel alloys that are more resistant to general corrosion and pitting/crevice corrosion than the conventional 4.0/).chromium-nickel austenitic stainless steels [1]. Molybdenum-bearing austenitic stainless steels are types of stainless steel alloys that are more resistant to general corrosion and pitting/crevice corrosion than the conventional 4.0/). The machining of these materials is quite problematic It is because of high strength, low thermal conductivity, and the tendency of work hardening [2,4]. These properties make stainless steel 316 material tend to machine with higher cutting force, higher generated cutting temperature, and built-up edge formation, which negatively affected the machined surface quality and tool life. It is quite worthy of mentioning that optimum cutting speed and feed rate are prominent parameters for tool life extension [5]
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