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Surface Characteristics of Machined NiTi Shape Memory Alloy: The Effects of Cryogenic Cooling and Preheating Conditions

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Abstract

This experimental study focuses on the phase state and phase transformation response of the surface and subsurface of machined NiTi alloys. X-ray diffraction (XRD) analysis and differential scanning calorimeter techniques were utilized to measure the phase state and the transformation response of machined specimens, respectively. Specimens were machined under dry machining at ambient temperature, preheated conditions, and cryogenic cooling conditions at various cutting speeds. The findings from this research demonstrate that cryogenic machining substantially alters austenite finish temperature of martensitic NiTi alloy. Austenite finish (A f) temperature shows more than 25 percent increase resulting from cryogenic machining compared with austenite finish temperature of as-received NiTi. Dry and preheated conditions do not substantially alter austenite finish temperature. XRD analysis shows that distinctive transformation from martensite to austenite occurs during machining process in all three conditions. Complete transformation from martensite to austenite is observed in dry cutting at all selected cutting speeds.

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Acknowledgments

Support from the NASA EPSCOR Program under Grant No. NNX11AQ31A and the NASA FAP Aeronautical Sciences Project are greatly acknowledged.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Technology, Marmara University, Goztepe Campus, Kadikoy, 34722, Istanbul, Turkey

    Y. Kaynak

  2. Department of Mechanical Engineering, College of Engineering, University of Kentucky, Lexington, KY, 40506, USA

    B. Huang, H. E. Karaca & I. S. Jawahir

  3. Institute for Sustainable Manufacturing (ISM), University of Kentucky, Lexington, KY, 40506, USA

    B. Huang & I. S. Jawahir

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  1. Y. Kaynak
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Correspondence to Y. Kaynak.

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Kaynak, Y., Huang, B., Karaca, H.E. et al. Surface Characteristics of Machined NiTi Shape Memory Alloy: The Effects of Cryogenic Cooling and Preheating Conditions. J. of Materi Eng and Perform 26, 3597–3606 (2017). https://doi.org/10.1007/s11665-017-2791-7

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  • DOI: https://doi.org/10.1007/s11665-017-2791-7

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