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Characterization of OT4-1 Alloy by Multi-Dome Forming Test

National Research University Higher School of Economics, Moscow 101000, Russia
Institute of Aircraft Machine Engineering and Transport, National Research Irkutsk State Technical University, Irkutsk 664074, Russia
Author to whom correspondence should be addressed.
Materials 2017, 10(8), 899;
Received: 18 July 2017 / Revised: 30 July 2017 / Accepted: 31 July 2017 / Published: 3 August 2017
(This article belongs to the Special Issue Wear-Corrosion Synergy, Nanocoating and Control of Materials)
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In this study, the rheological characteristics of a titanium alloy have been obtained by multi-dome bulging test. Free bulging process is an experimental technique that can be used to characterize material in conditions of biaxial tension during superplastic, as well as conventional, hot forming. The constitutive constants are calculated on a base of the information about the bulge geometry, applied pressure, and forming time. A multi-dome forming test allows one to reduce the number of the experiments required for the characterization, since every multi-dome test produces several domes of different size. In this study, a specific die for multi-dome test was used. The die has six holes with different radiuses of 20, 25, 30, 35, 40, and 45 mm. During a test, the specimen is clamped between blank holder and die holder, heated to a specific temperature, and formed by applying constant gas pressure. The experiments were conducted at different temperatures for OT4-1 titanium alloy. The constitutive constants were obtained by processing the experimental data using two different techniques and compared with tensile test results. In order to estimate the influence of friction on the experimental results and to verify obtained material characteristics, finite element (FE) simulation was performed. Finally, the results of FE simulation were compared with the experimental data. The results of the simulation show the advantage of material characterization based on multi dome tests and its interpretation by inverse analysis. The deviations produced by the effect of friction are more significant when the direct approach is applied instead of inverse analysis with a semi analytical model of the bulging process. View Full-Text
Keywords: material characterization; mathematical simulation; superplastic materials; titanium alloy; blow forming; multi-dome forming testing; tensile testing; super plastic forming (SPF) material characterization; mathematical simulation; superplastic materials; titanium alloy; blow forming; multi-dome forming testing; tensile testing; super plastic forming (SPF)

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Zakhariev, I.; Aksenov, S.; Kotov, A.; Kolesnikov, A. Characterization of OT4-1 Alloy by Multi-Dome Forming Test. Materials 2017, 10, 899.

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