Numerical Analysis of Superplastic Bulging Process of TiAl Sheet

Abstract:

The superplastic bulging process of TiAl sheet was simulated by coupling superplastic constitutive equation to finite element model. Based on this model, the effect of coefficient of friction between the sheet and mold and the size of the mold fillet on the superplastic bulging (SPB) performance of TiAl alloys sheet were studied by analyzing the evolution of equivalent plastic strain and thickness distribution in the sheet. The results showed that friction was the dominant factor of the nonuniform thickness of the sheet, while higher friction and smaller radius of mold fillet inhibited the over-thinning of sheet on the entry of mold cavity. The simulation results were in good agreement with the experimental results. Therefore, the present model could be used for optimizing the selction of the deformation parameters and the design of the structures.

• Periodical: Materials Science Forum (Volumes 747-748)
• Pages: 50-56
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.747-748.50
• Online since: February 2013
• Authors: Chuan Yun Wang, Jin Shan Li, Bin Tang, Hong Chao Kou
• Keywords: Constitutive Equation, Finite Element Model (FEM), Superplastic Bulging

References

[1] E.A. Loria, Gamma titanium aluminides as prospective structural materials, Intermetallics. 8 (2000) 1339-1345.

DOI: 10.1016/s0966-9795(00)00073-x

[2] Gopal Das, H. Kestler, H. Clemens , et al., Sheet gamma TiAl: status and opportunities, JOM. 56 (2004) 42-45.

DOI: 10.1007/s11837-004-0251-y

[3] H. Kestler, N. Eberhardt, S. Knippscheer, Some aspects on production of γ(TiAl) based components for transportation, International Symposium on Niobium for High Temperature Applications. Araxa, MG; Brazil, (2004).

[4] M.L. Blosser, R.R. Chen, I.H. Schmidt, Advanced Metallic Thermal Protection System Development, 40th Aerospace Sciences Meeting & Exhibit. Reno, Nevada, (2002).

DOI: 10.2514/6.2002-504

[5] J. Pilling, N. Ridley, Superplasticity in crystalline solids. Institute of Metals, London, (1988).

[6] J.H. Zhang, Research on The Superplasticity of TiAl-Based Alloy. Central South University, 2003. 10.

[7] R.M. Imayev, O.A. Kaibyshev, G.A. Salishchev, Mechanical behavior of fine grained TiAl intermetallic compound Superplasticity, Acta Metall Mater. 40 (1992) 581-587.

DOI: 10.1016/0956-7151(92)90407-6

[8] J.C. Ng, S.G. Luckey, G.T. Kridli, et al., Validation of a modified material model for use with shell elements to improve the predictive accuracy of the thickness distribution in superplastic forming of sheet metals, Journal of Materials Processing Technology. 211 (2011).

DOI: 10.1016/j.jmatprotec.2011.03.012

[9] S.G. Luckey, Development of finite element analysis based tool and methods for the design of advanced superplastic forming die and processes. Michigan Technological University, Houghton, MI, (2006).

[10] H.H. Chen, H.Y. Wu, W.S. Lee, et al., Deformation behavior in superplastic 5083 Al alloy during biaxial gas pressure lubrication, Materials Science and Technology. 24 (2008) 49-54.

DOI: 10.1179/174328407x248497