Ефективність комплексної хіміко-термічної обробки для зміцнення швидкорізальної сталі Р6М5

Editorial Board PCSS Journal; Viktoriia Kozechko; Valentyn Kozechko; Yuliia Yakubenko; Volodymyr Kozechko; Oleksandr Bohdanov

doi:10.15330/pcss.26.2.335-343

Authors

Viktoriia Kozechko Czestochowa University of Technology, Czestochowa, Poland
Valentyn Kozechko National Technical University "Dnipro Polytechnic", Dnipro, Ukraine
Yuliia Yakubenko Dnipro state agrarian and economic university, Dnipro, Ukraine
Volodymyr Kozechko Dnipro state agrarian and economic university, Dnipro, Ukraine
Oleksandr Bohdanov National Technical University "Dnipro Polytechnic", Dnipro, Ukraine

DOI:

https://doi.org/10.15330/pcss.26.2.335-343

Keywords:

chemico-thermal treatment, high-speed steel, comprehensive treatment, Р6М5, microhardness

Abstract

The study demonstrates that after chemico-thermal treatment, a diffusion layer of borides with a thickness of 25-37 µm and a needle-like structure formed on the surface of R6M5 steel, providing high wear resistance and hardness of the material. The main phases identified on the surface are FeB, Fe2B, CrB, and Cr2B. In the transition zone between the surface boride layer and the base material, a decrease in the concentration of boron and chromium was observed, ensuring a gradual transition to the main structure of the steel.

Microhardness analysis showed a significant increase in surface hardness after chemico-thermal treatment: from 630 HV to 2650 HV on the surface, with a gradual decrease to 895 HV at a depth of 75 µm. This indicates the effectiveness of the treatment in improving the surface properties of the steel.

Chemico-thermal treatment of high-speed steel R6M5 significantly enhances its wear resistance and corrosion resistance due to the formation of a protective boride layer. The high content of alloying elements limits the penetration of boron into the material's depth, allowing its higher concentration on the surface. The internal layers of the steel retain their original microstructure, ensuring the overall strength of the material. The obtained results confirm the effectiveness of chromoboration as a method for surface hardening of high-speed steel R6M5, significantly improving its performance characteristics.

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