Polzunov Altai State Technical University (Barnaul, Russia)

Sh. Kh. Nguyen, Postgraduate Student, Dept. of Advanced Special Materials, syhaimta@gmail.com

M. N. Zenin, Postgraduate Student, Dept. of Advanced Special Materials, mikhail.zenin.96@mail.ru

Polzunov Altai State Technical University (Barnaul, Russia)¹ ; Zhejiang Brilliant Refrigeration Equipment Co., Ltd (Xingchang, China)²
M. A. Guryev, Cand. Eng., Associate Prof., Dept. of Mechanical Engineering Technology¹, Technical Director², gurievma@mail.ru

Altai State University (Barnaul, Russia)¹ ; Wuhan Textile University (Wuhan, China)² ; Innovation Center for Advanced Textile Technologies (Jianhu Laboratory) (Shaoxing, China)³
S. G. Ivanov, Dr. Eng., Prof., Dept. of Technosphere Safety and Analytical Chemistry¹, Leading Researcher², Head of the Advanced Materials Laboratory³, serg225582@yandex.ru

Polzunov Altai State Technical University (Barnaul, Russia)¹ ; Altai State University (Barnaul, Russia)²
A. M. Guryev, Dr. Eng., Prof., Dept. of Descriptive Geometry and Graphics¹, Leading Researcher²,  gurievam@mail.ru

Wuhan Textile University (Wuhan, China)¹ ; Innovation Center for Advanced Textile Technologies (Jianhu Laboratory) (Shaoxing, China)²
M. Shunchi, Head¹, Head of Advanced Equipment and Materials Direction², sqmei@wtu.edu.cn

The work investigated the kinetics of perlite formation and the accompanying change in the microstructure of high-manganese steel Fe–1.1C–13Mn–2Cr as a result of isothermal annealing at a temperature of 550 °C with an exposure time of 2 hours and 8 hours. It was found that isothermal annealing leads to the formation of a complex microstructure consisting of perlite colonies and residual austenite. It is shown that with increasing isothermal exposure time, the volume fraction of pearlite decreases from 83.59 % to 59.45 %, which indicates partial dissolution of carbides and phase redistribution. It is noted that the formation of pearlite during annealing of Hadfield steel, which is additionally alloyed with 2 mass. % Cr allows for a significant intensification of the perlite formation process: during the isothermal annealing of Fe–1.1C–13Mn–2Cr steel at a temperature of 550 °C for 120 minutes, the maximum perlite content reaches 83.59 vol. % compared to Fe–0.8C–12Mn steel, where the maximum perlite content does not exceed 35 vol. % after 150 minutes of exposure at 550 °C. The obtained results allow us to control the structural and phase state of high-manganese austenitic steel, as isothermal annealing at 550 °C can be effectively used as a preliminary stage in the development of heat treatment modes for Fe–1.1C–13Mn–2Cr steel, providing grain refinement through γ – α phase transitions and subsequent optimization of mechanical properties. In particular, it increases the impact strength and wear resistance.

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