High speed turning of Inconel 718 using PVD-coated PCBN tools

Sein Soo, Sarmad Khan, David Aspinwall, Peter Harden, Andrew L. Mantle, Gregor Kappmeyer, David Pearson, Rachid M'Saoubi

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
334 Downloads (Pure)

Abstract

Five different coatings and two PCBN grades were evaluated when high speed turning Inconel 718. Tool life was 40% higher when employing TiSiN coated over uncoated inserts at 200 m/min. When operating at 300-450 m/min however, coatings provided no appreciable benefit. Workpiece surface roughness varied between ~0.25-1.05 µm Ra while cutting forces were <300 N. Increased workpiece microhardness and microstructural deformation were apparent with worn inserts. Medium cBN content (65%) inserts generated near surface compressive residual stresses of approximately −440 MPa as opposed to values of −90 MPa (measured parallel to feed) when using low cBN content (50%) tools.
Original languageEnglish
Pages (from-to)89-92
Number of pages4
JournalCIRP Annals - Manufacturing Technology
Volume65
Issue number1
Early online date6 Jan 2016
DOIs
Publication statusE-pub ahead of print - 6 Jan 2016

Keywords

  • Coating
  • Surface integrity
  • Nickel alloy

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