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Modeling of Transformation Superplastic Forming of Ti Alloys

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Abstract

Transformation superplastic forming is an attractive alternative forming technique to microstructural superplastic forming, since it requires no special microstructures and, therefore, eliminates the limitation of superplastic forming capability to only expensive materials with stable high-temperature fine grains. Transformation superplasticity occurs through biasing the internal stress produced from an allotropic phase transformation by a small external stress. In this work, finite element modeling was implemented to study the transformation superplastic forming of domes from flat circular thin plate samples. The evolution and distribution of stress, strain, and dome thickness was analyzed in detail. The thickness distributions in the formed domes were compared with the theoretical predictions of two models, which assume different stress states in the domes. The appropriate stress state was identified through this comparison. Different gas pressure amplitudes were applied during forming to investigate the effect on the formed-dome apex height, when the forming time was fixed.

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Acknowledgment

The support form University of Nevada, Reno is greatly appreciated.

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  1. Chemical and Metallurgical Engineering, University of Nevada, Reno, NV, 89557, USA

    Qizhen Li

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  1. Qizhen Li
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Correspondence to Qizhen Li.

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This article was presented at Materials Science & Technology 2007, Automotive and Ground Vehicles symposium held September 16-20, 2007, in Detroit, MI.

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Li, Q. Modeling of Transformation Superplastic Forming of Ti Alloys. J. of Materi Eng and Perform 17, 363–368 (2008). https://doi.org/10.1007/s11665-008-9214-8

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  • DOI: https://doi.org/10.1007/s11665-008-9214-8

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