Abstract This article considers the change in the tribological characteristics of medium carbon steel after its anodic plasma electrolytic nitrocarburising in a carbamide electrolyte. Phase and elemental composition of the nitrocarburised layer was studied using X-ray analysis and nuclear backscattering of protons. Optical and electron microscopes were used to observe friction tracks. It has been found out that the wear process in nitrocarburised samples is followed by plastic displacement of the metal in the friction contact zone according to the molecular-mechanical and fatigue theory of wear and application of the Kragelsky criterion. It has been shown that an increase in the sliding velocity of 0.5 m/s to 1.5 m/s results in a linear decrease in the friction coefficient from 0.65 to 0.45. The minimum wear rate is achieved after nitrocarburising of steel at 750 °C for 7 min and a sliding speed of (0.4–0.55) m/s. Anodic nitrocarburising increases the wear resistance of steel by 40% compared to quenching at a sliding speed of 0.9 m/s.

中文翻译：

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中碳钢等离子电解氮碳共渗磨损机理

摘要 本文研究了中碳钢在尿素电解液中进行阳极等离子体电解氮碳共渗后摩擦学特性的变化。使用 X 射线分析和质子的核背散射研究了氮碳共渗层的相和元素组成。使用光学和电子显微镜观察摩擦轨迹。根据磨损的分子力学和疲劳理论和 Kragelsky 准则的应用，已经发现，在氮碳共渗样品的磨损过程之后，摩擦接触区中的金属发生塑性位移。已经表明，滑动速度从 0.5 m/s 增加到 1.5 m/s 会导致摩擦系数从 0.65 线性下降到 0.45。钢在 750 °C 下氮碳共渗 7 分钟和滑动速度为 (0.4–0.55) m/s 后达到最小磨损率。与以 0.9 m/s 的滑动速度淬火相比，阳极氮碳共渗可将钢的耐磨性提高 40%。