Baikov Institute of Metallurgy and Materials Science, Moscow, Russia

V. A. Andreev, Leading Researcher, Candidate of Technical Sciences, e-mail: andreev.icmateks@gmail.com
R. D. Karelin, Researcher, Candidate of Technical Sciences, e-mail: rdkarelin@gmail.com
V. S. Komarov, Researcher, Candidate of Technical Sciences, e-mail: kom1107@yandex.ru

Baikov Institute of Metallurgy and Materials Science, Moscow, Russia¹ ; National University of Science and Technology “MISIS”, Moscow, Russia²
M. M. Skripalenko, Associate Professor of the Chair for Metal Forming², Senior Researcher¹, Candidate of Technical Sciences, e-mail: mms@misis.ru

The results of computer simulation of the processes of rolling in a three-roll mill of titanium nickelide billets of equiatomic and nickel-transequiatomic compositions are presented. Computer modeling was performed using the QForm finite element analysis computing environment. Simulation of rolling processes was carried out in the deformation temperature range of 600–1000 °C using billets with an initial diameter of 40 mm, a wall thickness of 10 mm, a length of 250 mm, and a plug with a diameter of 20 mm. The diameter of the groove formed by the rollers in pitch point is 30 mm. Rolling was simulated at a roll feed angle of 20 degrees and rolling angle 7 degrees. The rotation speed of the rolls was set to 90 rpm. To assess the deformed state, the trajectories of movement of the billet`s points located in the cross section of the deformed billet at the radius were constructed, and the lengths of the resulting trajectories were estimated as a result of modeling various rolling modes. To assess the deformed state of the billet and the uniformity of the strain distribution, a study of the distribution of accumulated strain in the volume of the billets was carried out. The stress state and plasticity of the billets under various modes were assessed by studying the change in the values of the normalized average stress at selected points while they were in the deformation zone. It has been established that rolling at a temperature of 1000 °C, compared to rolling at a temperature of 600 °C, reduces the spread of accumulated strain values in the billet. A more uniform distribution of deformation over the cross section of the billet during rolling at a temperature of 1000 degrees C for the two alloys under study is determined by the smaller difference in the lengths of the largest and smallest trajectories of the points, which are located on the radius of the billet along the wall thickness. When rolling at a temperature of 1000 °C, the values of the normalized average stress decrease by up to 10% for equiatomic and up to 5% for transequiatomic alloys. To realize a more favorable stress-strain state and obtain a more regular microstructure of the billet under the conditions of the conducted research, it is advisable to carry out rolling of the indicated alloys at a temperature of 1000 °C.

The study was carried out within the framework of the Russian Science Foundation project No. 23-19-00729, https://rscf.ru/project/23-19-00729/.

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