Abstract
Following a brief review on the turning of nickel-based superalloys, the paper evaluates the machinability and workpiece surface integrity of a powder metallurgy HIP-ed (PHIP) RR1000 alloy, involving two phases of turning experiments using TiN/Al2O3/Ti(C,N) coated carbide inserts. Based on a maximum flank wear criteria of 200 μm, tool life exceeded 40 min when operating at or below 100 m/min; however, Taylor tool life curves were extremely steep. At a feed rate of 0.08 mm/rev, workpiece surface roughness was ~ 0.5 μm Ra. Tests at cutting speeds of 80 m/min or less with new tools showed the ‘best/acceptable’ surface integrity with no visible white layer or plucking and a maximum distorted layer of ~ 6 μm deep. In contrast, the surfaces produced using worn tools at a cutting speed of 100 m/min showed a distorted layer of ~ 20 μm deep with evidence of surface laps and plucking to a depth of ~ 15 μm.
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Acknowledgements
The authors would like to thank Rolls–Royce plc and in particular to Dr. Wayne Voice for the provision of workpiece material and technical advice. Additional thanks are due to Sandvik Coromant for the supply of tooling and Seco Tools for supply of the Jetstream tool holders.
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Hood, R., Soo, S.L., Aspinwall, D.K. et al. Tool life and workpiece surface integrity when turning an RR1000 nickel-based superalloy. Int J Adv Manuf Technol 98, 2461–2468 (2018). https://doi.org/10.1007/s00170-018-2371-5
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DOI: https://doi.org/10.1007/s00170-018-2371-5