Improving the Performance Properties of Chromium-Molybdenum- Vanadium steel 30X3MF for Automotive Parts by Nitrocementation in an Active Medium

Purpose of research to study the effect of nitrocementation of chromium-molybdenum-vanadium steel 30X3MF in a highly active paste-like nitrogen-carbon medium on the structure, hardness and wear resistance of surface diffusion layers.

Methods. The study of nitrocementation was carried out on samples of improved chromium-molybdenum-vanadium steel 30X3MF (0.38% C; 2.7% Cr; 0.47% Mn; 0.27% Mo; 0.14% V). Nitrocementation was carried out in a paste-like medium consisting of amorphous carbon (carbon black DG 100) - 80% and potassium ferrogenide KuFe(CN)6 – 20%. Nitrocementation was carried out in a shaft laboratory furnace SSHOL-10/11 with automatic temperature control. The hardness of the samples was measured on a TP-2 (Rockwell) hardness tester, microhardness was measured on a PMT-3 microhardness meter. A metallographic optical microscope POLYLAB ML-02 and an electronic scanning microscope QUANTA 3D 200i were used for the analysis. Wear resistance tests of 30X3MF nitrocemented steel samples were carried out on a standard SMC-2 friction machine.

Results. The results of an experimental study of the nitrocementation of 30X3MF steel in a highly active paste-like medium based on potassium ferrocyanide and amorphous soot on its structure and properties are presented. It is shown that nitrocementation promotes the formation of a large number of high-hard carbonitrides in the diffusion layers, which cause a significant (several times) increase in the wear resistance of steel.

Conclusion. The proposed method of nitrocementation, in our opinion, will be very effective for increasing the durability of parts made of improved 30X3MF steel and the like, working at increased power loads in combination with abrasive wear.

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