National University of Science and Technology MISIS, Moscow, Russia:

S. P. Galkin, Dr. Eng., Prof., Dept. of Metal Forming, e-mail: glk-omd@yandex.ru
Yu. V. Gamin, Cand. Eng., Associate Prof., Dept. of Metal Forming, e-mail: y.gamin@mail.ru
T. Yu. Kin, Postgraduate Student, Dept. of Metal Forming, e-mail: tatianakin@mail.ru

JSC Plant of High-Quality Alloys, Moscow, Russia:

S. A. Kostin, Development Director, e-mail: kostin@ezks.ru

An experimental testing of the technology for obtaining a deformed Co-28Cr-6Mo alloy using radial shear rolling is presented. Mechanical peeled and homogenized ingots of vacuum induction melting with a diameter of 57 mm were subjected to radial shear rolling in 4-5 passes to bars with a diameter of 18 and 29 mm at a temperature of 1200 °C with quenching of the final profile in water or cooling in air. A study of the microstructure, mechanical properties in the cast and deformed state was carried out. The requirements of GOST ISO 5832-12-2009 in terms of normalized indicators - tensile strength, yield strength and relative elongation are fully satisfied. At the same time, there is an increase in relative elongation by 1.4-1.6 times compared with the initial cast state and an excess of regulatory requirements by 3.0-3.3 times. The experimental technology has been implemented at NUST MISIS radial shear rolling mills and has the prospect of industrial scaling. The very significant advantages of the proposed technology include a small total elongation ratio (μ = 3.86), which ensures that the requirements of GOST on mechanical properties for the deformed Co-Cr-Mo alloy are met.
The study was supported by the Russian Science Foundation grant No. 23-19-00477, https://rscf.ru/project/23-19-00477/.

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