DOI: 10.18503/1995-2732-2024-22-2-120-127
Abstract
The article discusses the results of an experimental study on the quality of joining two homogeneous workpieces made of titanium alloy OT4-1. Using the method of upsetting with torsion, a permanent joint was achieved due to plastic deformation. Joining is ensured at a temperature of 600°C. The condition for forming the connection between the workpieces is no sliding between the end of each workpiece and the die. Upsetting with torsion was carried out using a modernized hydraulic press model DB-2432 with a force of 1.6 MN. The article contains results of full-scale experiments on the formation of a hybrid workpiece from titanium alloy OT4-1, as well as the results of computer simulation of upsetting with torsion of the hybrid workpiece, the dependence between relative elongation of alloy samples and temperature, and the distribution of microhardness over the cross section of the hybrid sample after upsetting with torsion in the selected deformation mode. The full-scale experiments carried out in different modes contributed to selecting the mode of forming the hybrid workpiece by upsetting with torsion. The selected mode is characterized by the deformation of a package of two workpieces at a temperature of 600°C between the dies heated to 300°C. It has been established that the selected forming mode with heating of workpieces and heating of the forging tool ensures a reliable joining of workpieces with a high quality. To verify the quality of the joining of two homogeneous samples of the OT4-1 alloy, the authors performed a metallographic study. The metallographic results obtained at magnifications of ×2500 and ×5000 of the joint area confirm reliability of the formed joint. The results obtained can be applied in developing a methodology for designing a technological process for hot die forging of forgings from a hybrid workpiece.
Keywords
titanium alloy OT4-1, hybrid workpieces, upsetting with torsion, forming with heating, microstructures, permanent joint due to plastic deformation
For citation
Petrov P.A., Burlakov I.A., Nguyen Khanh Toan, Vo Phan Thanh Dat. Producing Hybrid Workpieces from Titanium Alloy OT4-1 by Hot Upsetting with Torsion. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2024, vol. 22, no. 2, pp. 120-127. https://doi.org/10.18503/1995-2732-2024-22-2-120-127
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