Structure and Properties of Diffusion Layers after Boriding of Steels with an Overequilibrium Nitrogen Content

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发表日期：

2024年2月1日

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G. S. Seval’nev,
K. V. Dul’nev,
I. O. Bannykh,
A. A. Krasulya,
S. G. Tsikh,
E. I. Lukin

摘要

Abstract

Low-alloy high-nitrogen steels with various nitrogen and chromium concentrations after diffusion saturation of the surface with boron are subjected to metallographic analysis and wear tests. The structure and phase composition of the diffusion layers after boriding and hardening heat treatment are investigated. The structure of the diffusion layers consists of borides FeB and Fe₂B and excess phases Cr₂(C,N) and (Cr,Fe)B₂. The results of wear tests under dry sliding friction conditions demonstrate that, after thermochemical treatment and subsequent heat treatment, the wear rate of the samples decreases by 2 times, and the coefficient of friction is more stable for samples after boriding with 5 wt % Cr and 0.24 wt % N.