Abstract
A coarse-grained (order of 1 mm) Ti-5553 metastable beta alloy was subjected to multiple passes of low-temperature forging and multiple forging plus annealing cycles, respectively. In the forging only processing, strain was concentrated in the shear bands formed and accumulated with each forging pass, resulting in a heterogeneous microstructure and eventual cracking along the shear bands. In contrast, the introduction of a short beta annealing after each forging step led to fine recrystallized grains (50 to 100 µm) formed in the shear bands, and a uniformly refined beta grain structure after four cycles. This is attributed to the strengthening effect of the fine grains, causing redistribution of most severe strains to the coarse grain region in the subsequent forging, consistent with the simulated results by finite element analysis. The analyses of the microstructures and simulated strain distributions revealed that the critical strain for recrystallization is between 0.2 and 0.5 and the strain to fracture to be ~0.8 to 0.9. The fine-grained (50 to 100 µm) beta alloy, however, fractured at a much smaller strain of <0.4 during the next forging step, owing to the formation of stress-induced martensitic α″ which is more prevalent in fine grains than in coarse ones.
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Acknowledgment
This investigation is partially supported by the ARC Centre of Excellence for Design in Light Metals and the Australia-China Research Centre for Light Metals. AZ acknowledges the receipt of a University of Melbourne postgraduate scholarship and YD the financial support from the Chinese Scholarship Council. AZ is grateful for useful discussions with Dr. Wei Xu.
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Zafari, A., Ding, Y., Cui, J. et al. Achieving Fine Beta Grain Structure in a Metastable Beta Titanium Alloy Through Multiple Forging-Annealing Cycles. Metall Mater Trans A 47, 3633–3648 (2016). https://doi.org/10.1007/s11661-016-3496-5
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DOI: https://doi.org/10.1007/s11661-016-3496-5