Impact of supercritical carbon dioxide cooling with Minimum Quantity Lubrication on tool wear and surface integrity in the milling of AISI 304L stainless steel
| Autor: | Przemyslaw Litwa, Krystian K. Wika, Carl Hitchens |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Metallurgy 02 engineering and technology Surfaces and Interfaces engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Surfaces Coatings and Films Coolant chemistry.chemical_compound 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Machining Mechanics of Materials Tungsten carbide Materials Chemistry engineering Lubrication Surface roughness Tool wear Austenitic stainless steel 0210 nano-technology Surface integrity |
| Zdroj: | Wear. :1691-1701 |
| ISSN: | 0043-1648 |
| DOI: | 10.1016/j.wear.2019.01.103 |
| Popis: | In this study, the effect of supercritical carbon dioxide cooling with Minimum Quantity Lubrication (scCO2+MQL) on tool wear and surface integrity of AISI 304 L austenitic stainless steel in milling was investigated. A series of machining experiments based on a Design of Experiments (DoE) was carried out at various combinations of cutting parameters to investigate the effect of cutting speed and feed rate on tool wear, near-surface residual stresses, surface roughness and microhardness. The results were compared with the experimental results obtained from milling with flood coolant. A significant improvement in tool life was observed in milling with the scCO2+MQL using multilayer coated tungsten carbide inserts. The tool life in terms of cutting time increased by ∼324%, in comparison to a baseline flood coolant. Further, a decrease in surface roughness value (Ra) by about 30%, from 1.09 µm for flood coolant to 0.78 µm after face milling with scCO2+MQL was seen. Additionally, the Ra value slightly increased after machining, for both cooling methods with the increase of cutting speed of ∼19%. The observed changes in Ra value were discussed in terms of a built-up-edge (BUE) formation. There were no apparent differences in surface microhardness between both cooling methods. However, the surface microhardness increased with feed rate after milling with both scCO2+MQL and flood coolant due to the increased strain hardening. Also, there was no significant difference in residual stresses after milling, neither with scCO2+MQL nor the flood coolant. The surface residual stress values obtained in the transverse and longitudinal directions were consistent with a predictive model with errors of around 3–8%. |
| Databáze: | OpenAIRE |
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