Abstract
As-received pure titanium (Ti) foil with a thickness of 50 μm was annealed at 600 °C, 650 °C, and 700 °C for 30–60 min to obtain different grain sizes. Then the effects of grain size on the forming properties of pure Ti foil and the quality of formed cups made by micro deep drawing. Results indicate that the as-received pure Ti sample has poor formability and serious wrinkling occurs at the drawn cup mouth. Moreover, it has an obvious non-uniform cross-sectional profile and symmetry of the drawn cup wall. When the blank annealing temperature is 600 °C/60 min, the wrinkles can hardly be seen on the cup surface, and there are characteristics of uniform distribution and good symmetry in the cross-sectional profile of the micro drawn cup. However, when the annealing temperature increases from 600 to 650 °C/60 min, the number of wrinkles gradually increases, and the cross-sectional profile of the drawn cup deteriorates. Furthermore, a fracture occurs at the punch corner of the drawn cup formed by blank annealing at 700 °C/60 min. Besides, the scatter of the deformation pressure increases with greater grain sizes; this may be because the random orientation of individual grains leads to a scattering effect of the deformation pressure. The micro drawn part with larger grains has greater thickness reduction and uneven thickness distribution around the punch corner. Surface grains slide along the grain boundaries and rotate out of their original position, resulting in surface roughening and uneven thickness distribution during micro deep drawing.
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This work was supported by The Shanxi Province Unveils Bidding Project (20201101020).
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Peisheng Han: investigation and writing original draft preparation. Guofeng Yuan, Xiaoyu Zhu, and YuLin Xing: investigation and data analysis. Xiaogang Wang: conceptualization, methodology, and validation.
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Han, P., Yuan, G., Zhu, X. et al. Grain size effect of pure Ti foils by micro blanking-deep-drawing compound process. Int J Adv Manuf Technol 123, 1799–1810 (2022). https://doi.org/10.1007/s00170-022-10279-z
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DOI: https://doi.org/10.1007/s00170-022-10279-z