Influence of the depth of cut on the AM nitinol properties in flood and cryogenic machining

–

Influence of the depth of cut on the AM nitinol properties in flood and cryogenic machining

GUARISE Alessandra, BERTOLINI Rachele, GHIOTTI Andrea, BRUSCHI Stefania

Abstract. Nickel-titanium alloys, commonly called Nitinol, are known for two fundamental properties, namely the shape memory effect (SME) and the superelasticity effect (SE), which make Nitinol a material of great interest for applications in various fields, such as biomedical, aerospace, automotive, and electronics. Most of the published research studies discuss the Nitinol properties after just one step of fabrication, e.g. forming, casting, additive manufacturing (AM), or machining. On the contrary, this work focuses on a process chain including AM followed by heat treatment and both flood and cryogenic machining. In particular, the depth of cut during the last machining step was varied (0.1, 0.25, and 0.4 mm), to investigate its effects on the AM and heat-treated Nitinol in terms of machined surface finish and transformation temperatures. It was found that when cutting with a depth of cut of 0.25 mm, the workpiece shows the worst roughness, regardless of the material microstructure and machining condition. However, for other depths of cut, there is a clear improvement in terms of surface finish. Machining increases the Nitinol transformation temperatures, but changing the depth of cut does not have a significant effect. Cryogenic machining induces a worse surface finish, but has less effect on the transformation temperatures than flood machining.

Keywords
Nitinol, Additive Manufacturing, Machining, Depth of Cut, Surface Finish

Published online 4/24/2024, 10 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: GUARISE Alessandra, BERTOLINI Rachele, GHIOTTI Andrea, BRUSCHI Stefania, Influence of the depth of cut on the AM nitinol properties in flood and cryogenic machining, Materials Research Proceedings, Vol. 41, pp 1925-1934, 2024

DOI: https://doi.org/10.21741/9781644903131-213

The article was published as article 213 of the book Material Forming

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

References
[1] G.B. Kauffman., M. Isaac, The story of nitinol: the serendipitous discovery of the memory metal and its applications, The chemical educator 2 (1997): 1-21. https://doi.org/10.1007/s00897970111a
[2] E. Patoor, D.C. Lagoudas, P.B. Entchev, L.C. Brinson, X. Gao, Shape memory alloys, Part I: General properties and modeling of single crystals, Mechanics of materials, 38.5-6 (2006), 391-429. https://doi.org/10.1016/j.mechmat.2005.05.027
[3] M. Elahinia, N. Shayesteh Moghaddam, M. Taheri Andani, A. Amerinatanzi, B. A. Bimber, R. F. Hamilton, Fabrication of NiTi through additive manufacturing: A review, Progress in Materials Science, vol. 83. Elsevier Ltd, pp. 630–663, Oct. 01, 2016. https://doi.org/10.1016/j.pmatsci.2016.08.001
[4] Y. Kaynak, H. E. Karaca, I. S. Jawahir, Cutting speed dependent microstructure and transformation behavior of NiTi alloy in dry and cryogenic machining, Journal of Materials Engineering and Performance 24 (2015): 452-460. https://doi.org/10.1007/s11665-014-1247-6
[5] H. Yang, K. Sakai, H. Shizuka, Y. Kurebayashi, K. Hayakawa, T. Nagare, Effect of cutting speed on shape recovery of work material in cutting process of super-elastic NiTi alloy, International Journal of Automation Technology, 15.1 (2021), 24-33. https://doi.org/10.20965/ijat.2021.p0024
[6] R. Bertolini, S. Bruschi, A. Ghiotti, E. Savio, L. Ceseracciu, I.S. Jawahir, Surface integrity and superelastic response of additively manufactured Nitinol after heat treatment and finish machining, CIRP Annals (2023). https://doi.org/10.1016/j.cirp.2023.04.025
[7] S. Khademzadeh, F. Zanini, J. Rocco, K. Brunelli, P.F. Bariani, S. Carmignato, Quality enhancement of microstructure and surface topography of NiTi parts produced by laser powder bed fusion, CIRP Journal of Manufacturing Science and Technology 31 (2020), 575-582. https://doi.org/10.1016/j.cirp.2023.04.025
[8] A. Bordin, S. Bruschi, A. Ghiotti, P.F. Bariani, Analysis of tool wear in cryogenic machining of additive manufactured Ti6Al4V alloy, Wear 328 (2015), 89-99. https://doi.org/10.1016/j.wear.2015.01.030
[9] ASTM F2004-17: Standard Test Method for Transformation Temperature of Nickel-Titanium Alloys by Thermal Analysis.
[10] BS EN ISO 25178-2:2022: Geometrical product specifications (GPS). Surface texture: Areal. Terms, definitions and surface texture parameters.
[11] X. B Wang, B. Verlinden, J. Van Humbeeck, R-phase transformation in NiTi alloys, Materials Science and Technology (United Kingdom), vol. 30, no. 13, pp. 1517–1529 (2014). https://doi.org/10.1179/1743284714Y.0000000590
[12] R. Bertolini, A. Ghiotti, S. Bruschi, Graphene nanoplatelets as additives to MQL for improving tool life in machining Inconel 718 alloy, Wear 476 (2021), 203656. https://doi.org/10.1016/j.wear.2021.203656