Abstract
NiTi shape memory alloy products are becoming more and more popular in many areas. But owing to the unique characteristics of NiTi shape memory alloys, it is still considered restrictive by the traditional machining methods of producing NiTi shape memory alloys for finished products. Flood coolant and cryogenic with liquid nitrogen (LN2)–assisted machining is desired to improve machinability of material in the turning procedure. Experiments were conducted to examine the influence of cooling conditions (dry, flood, and cryogenic LN2) on turning NiTi shape memory alloys at different cutting speeds. Tool wear, cutting force, and surface integrity were selected as evaluation characteristics to explore the effects of different cooling methods and the stress-induced martensitic phase during the turning process. The study shows that the appearance of the stress-induced martensitic phase during the turning process harms the machinability of NiTi shape memory alloys. Flood conditions accomplish lower tool wear and cutting force at 15 m/min. Cryogenic conditions achieve higher machinability at 125 m/min.
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This work was supported by the National Natural Science Foundation of China (51975335) and the Construction Engineering Special Fund of “Taishan Scholars” of Shandong Province (ts20190975).
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Conceptualizations: Yanzhe Zhao and Jie Sun; methodology: Yanzhe Zhao, Jie Sun, and Kai Guo; investigation: Yanzhe Zhao and Jianfeng Li; writing, review, and editing: all the authors.
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Zhao, Y., Guo, K., Li, J. et al. Investigation on machinability of NiTi shape memory alloys under different cooling conditions. Int J Adv Manuf Technol 116, 1913–1923 (2021). https://doi.org/10.1007/s00170-021-07563-9
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DOI: https://doi.org/10.1007/s00170-021-07563-9