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The influence of cutting parameters on the defect structure of subsurface in orthogonal cutting of titanium alloy

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Abstract

Subsurface microstructure alteration has been a major concern to implement micromachining of titanium alloy in the high-tech industry. To quantitatively promulgate the underlying mechanisms of this alteration, a discrete dislocation dynamics-based model is proposed and used to simulate the subsurface defects and their evolution under different cutting conditions. The model considers the subsurface dislocation configuration and inner stress distribution during the orthogonal cutting of titanium alloy. The results show that subsurface defect structure consists of plenty of dislocation dipoles, twining dislocation bands, and refined grains after cutting. In the primary shear zone, two different characteristics of subsurface damage layers can be found, the near-surface damage layer and deep-surface damage layer, which have different structural natures and distribution features. Moreover, it is found that high cutting speed and small depth of the cut can suppress the formation and propagation of subsurface defects. A powerful inner stress state would promote the distortion of the lattice and result in a microcrack within the subsurface matrix. The simulation results have been compared with experimental findings on the machined surface and subsurface of similar materials, and strong similarities were revealed and discussed.

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ACKNOWLEDGMENTS

This research work was jointly supported by the National Natural Science Foundation of China (Grant No. 51575138) and the State Key Program of National Natural Science Foundation of China (Grant No. 51535003).

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Jinxuan Bai & Qingshun Bai

  2. Centre for Precision Technologies, University of Huddersfield, Huddersfield, HD1 3DH, UK

    Zhen Tong

  3. Key Laboratory of E & M, Ministry of Education & Zhejiang Province, Zhejiang University of Technology, Hangzhou, 310032, People’s Republic of China

    Guoda Chen

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  1. Jinxuan Bai
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  2. Qingshun Bai
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Correspondence to Jinxuan Bai or Qingshun Bai.

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Bai, J., Bai, Q., Tong, Z. et al. The influence of cutting parameters on the defect structure of subsurface in orthogonal cutting of titanium alloy. Journal of Materials Research 33, 720–732 (2018). https://doi.org/10.1557/jmr.2017.397

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  • DOI: https://doi.org/10.1557/jmr.2017.397

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