Perm National Research Polytechnic University, Perm, Russia
S. K. Laptev, Postgraduate Student, Dept. of Metal Science, Thermal and Laser Processing of Metals, e-mail: sklaptev@platinum-perm.ru
A. A. Shatsov, Dr. Eng., Prof., Dept. of Metal Science, Thermal and Laser Processing of Metals, e-mail: shatsov@pstu.ru
L. V. Spivak, Dr. Phys.-Math., Prof., Dept. of Metal Science, Thermal and Laser Processing of Metals, e-mail: lspivak2@mail.ru
S. K. Grebenkov, Cand. Eng., Leading Engineer, Dept. of Metal Science, Thermal and Laser Processing of Metals, e-mail: drive@rtural.ru

The rack-and-pinion structure contributes 1-2 orders of magnitude more to the strength than the large-angle boundaries of the packages. Austenite packages and racks are formed, so its properties largely determine the characteristics of low-carbon martensitic steels (LCMS). Calorimetric and dilatometric methods have been used to study the phase transformations and structure of low-carbon martensitic steel 14Kh2G2NMFB during full quenching and quenching from the intercritical temperature range (ITR). It is shown that phase transformations during heating proceed via two mechanisms, begin with a shear one, in a certain temperature range there is an overlap of shear and diffusion mechanisms, and end with a diffusion one. The activation energy of the diffusion transition is determined. It is shown that the preferred mode of final quenching to obtain the best combination of mechanical and operational properties is hardening from ITR.

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