Machining and Phase Transformation Response of Room-Temperature Austenitic NiTi Shape Memory Alloy

Abstract

This experimental work reports the results of a study addressing tool wear, surface topography, and x-ray diffraction analysis for the finish cutting process of room-temperature austenitic NiTi alloy. Turning operation of NiTi alloy was conducted under dry, minimum quantity lubrication (MQL) and cryogenic cooling conditions at various cutting speeds. Findings revealed that cryogenic machining substantially reduced tool wear and improved surface topography and quality of the finished parts in comparison with the other two approaches. Phase transformation on the surface of work material was not observed after dry and MQL machining, but B19′ martensite phase was found on the surface of cryogenically machined samples.

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Acknowledgments

The author would like to offer sincere thanks to Prof. I.S. Jawahir and the Institute for Sustainable Manufacturing (ISM) for providing test equipments for this study. The author would like to thank Dr. S.W. Robertson from Nitinol Devices & Components, Inc. for providing work materials for this study. Additionally, gratitude is extended to Doc. Dr. M. Kemal Ozturk from Gazi University for providing XRD equipment.

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Correspondence to Yusuf Kaynak.

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Kaynak, Y. Machining and Phase Transformation Response of Room-Temperature Austenitic NiTi Shape Memory Alloy. J. of Materi Eng and Perform 23, 3354–3360 (2014). https://doi.org/10.1007/s11665-014-1058-9

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Keywords

  • cryogenic and MQL machining
  • phase transformation
  • room-temperature austenitic NiTi alloy
  • tool wear
  • XRD analysis