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Surface Integrity Evaluation When Turning Inconel 718 Alloy Using Sustainable Lubricating-Cooling Approaches

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Abstract

This novel work focuses on turning Inconel 718 alloy using different sustainable lubricating-cooling techniques. Cryogenic machining (Cryo), minimum quantity lubrication (MQL) and nanofluid MQL (NFMQL) were applied and their performances in terms of obtainable surface integrity evaluated in comparison with dry cutting (dry) and wet machining (wet). The surface integrity was analyzed from the aspect of surface roughness, surface morphology and defects, microhardness, microstructure, and chip morphology. The experimental results revealed that Cryo offered overall better performances when compared to dry, wet, MQL and NFMQL strategies: lower surface roughness, fewer surface defects and lower chip compression ratio were observed. Furthermore, increasing the cutting speed led to higher surface roughness and incidence of surface defects for all the applied strategies, except for Cryo.

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Abbreviations

Cryo:

Cryogenic machining

MQL:

Minimum quantity lubrication

NFMQL:

Nanofluid MQL

Dry:

Dry cutting

Wet:

Wet machining

LN2 :

Liquid nitrogen

Vc:

Cutting speed

f:

Feed rate

ap :

Depth of cut

CBN:

Cubic boron nitride

NFMQL_5:

Nanofluid MQL with 5 µm graphene nanoplatelets

NFMQL_15:

Nanofluid MQL with 15 µm graphene nanoplatelets

GNPs:

Graphene nanoplatelets

PVD:

Physical vapor deposition

GNF_5:

Graphene(5 μm)-LB2000 nanofluid

GNF_15:

Graphene(15 μm)-LB2000 nanofluid

SEM:

Scanning electron microscope

ETD:

Everhart–Thornley Detector

BSED:

Back Scattered Electron Detector

tc :

Chip thickness

λ:

Chip compression ratio

t0 :

Uncut chip thickness

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Acknowledgements

The authors wish to acknowledge with financial support of this research by China Scholarship Council (Grant No. 201906830023) and Nanjing University of Aeronautics and Astronautics PhD short-term visiting scholar project (Grant No. 190114DF05).

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Le Gong & Ning He

  2. Department of Industrial Engineering, University of Padova, Via Venezia 1, 35131, Padova, Italy

    Le Gong, Rachele Bertolini, Stefania Bruschi & Andrea Ghiotti

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  1. Le Gong
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Correspondence to Stefania Bruschi.

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Gong, L., Bertolini, R., Bruschi, S. et al. Surface Integrity Evaluation When Turning Inconel 718 Alloy Using Sustainable Lubricating-Cooling Approaches. Int. J. of Precis. Eng. and Manuf.-Green Tech. 9, 25–42 (2022). https://doi.org/10.1007/s40684-021-00310-1

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