Abstract
Tungsten heavy alloy parts have significant applications in high-energy radiological fields. Under the extreme physical environment, the microstructure in the machined surface affects its radiation resistance. In this work, we concentrated upon the machined surface morphology evolution and surface microstructural transformation in ultrasonic elliptical vibration cutting the 95W-3.5Ni-1.5Fe alloy. Results identified that a nanometer-level roughness surface was generated under the particular combination of processing conditions. Corresponding to the ultra-precision machining experiments, a multiscale theoretical simulation framework involving the dislocation density change was employed to recognize the machined surface microstructures. The framework was presented by coupling a physical-based dislocation dynamic model with a finite element analysis model through calculating and calibrating the critical coefficients in dislocation density-based constitutive equation. An ultra-precision machining simulation model was developed to reveal the influence of different machining conditions, such as the cutting depth, feedrate, ultrasonic vibration amplitude, and frequency, on surface formation and dislocation density distribution characteristics. Finally, these predictions were compared with experimental findings utilizing SEM tests for validation purposes.
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This study is funded by the Sichuan Science and Technology Program (2021YJ0547).
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Experiment and manuscript: Yanan Pan. Conceptualization, methodology, simulation, and review: Jinxuan Bai. Characterization testing: Zhiwei Xu.
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Pan, Y., Bai, J. & Xu, Z. Theoretical and numerical studies of surface microstructural transformation in ultrasonic elliptical vibration cutting tungsten heavy alloys. Int J Adv Manuf Technol 123, 3943–3953 (2022). https://doi.org/10.1007/s00170-022-10293-1
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DOI: https://doi.org/10.1007/s00170-022-10293-1