The Effect of N Content on the Microstructure and Wear Resistance of Improved High-Carbon Chromium Bearing Steel

IF 2.6 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING International Journal of Metalcasting Pub Date : 2024-08-29 DOI:10.1007/s40962-024-01443-0
Jincheng Liao, Jiamin Song, Yitao Yang
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Abstract

The impact of varying nitrogen (N) contents (65 ppm, 90 ppm, 115 ppm, 140 ppm) on the microstructure and wear resistance of high-carbon chromium bearing steel enriched with niobium was explored through optical microscopy (OM), scanning electron microscopy (SEM), electrolytic extraction, X-ray diffraction (XRD), and room temperature dry sliding friction and wear tests. The findings indicate that an optimal nitrogen addition can effectively refine grains and precipitates. Increasing nitrogen content led to a rise in NbCrN formation, with nitrogen increasingly substituting for carbon in NbC, resulting in the creation of Nb(C,N). The niobium-containing precipitates progressively assumed elongated shapes. At a nitrogen level of 115 ppm, the experimental steel demonstrated superior wear resistance, primarily due to the Mechanical Mixture Layer (MML) mitigating metal-to-metal friction and the hard precipitates of niobium and nitrogen in the matrix obstructing abrasive grain displacement. Consequently, the wear mechanism evolved from abrasive to oxidized adhesive wear.

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氮含量对改进型高碳铬轴承钢显微组织和耐磨性的影响
通过光学显微镜(OM)、扫描电子显微镜(SEM)、电解萃取、X 射线衍射(XRD)以及室温干滑动摩擦和磨损试验,探讨了不同氮(N)含量(65 ppm、90 ppm、115 ppm、140 ppm)对富含铌的高碳铬轴承钢的微观结构和耐磨性的影响。研究结果表明,最佳的氮添加量可有效细化晶粒和沉淀。氮含量的增加导致 NbCrN 的形成增加,氮越来越多地取代了 NbC 中的碳,从而产生了 Nb(C,N)。含铌沉淀物逐渐呈现出拉长的形状。氮含量为 115 ppm 时,实验钢表现出优异的耐磨性,这主要是由于机械混合层(MML)减轻了金属与金属之间的摩擦,基体中的铌和氮硬析出物阻碍了磨粒的位移。因此,磨损机制从磨料磨损演变为氧化粘着磨损。
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来源期刊
International Journal of Metalcasting
International Journal of Metalcasting 工程技术-冶金工程
CiteScore
4.20
自引率
42.30%
发文量
174
审稿时长
>12 weeks
期刊介绍: The International Journal of Metalcasting is dedicated to leading the transfer of research and technology for the global metalcasting industry. The quarterly publication keeps the latest developments in metalcasting research and technology in front of the scientific leaders in our global industry throughout the year. All papers published in the the journal are approved after a rigorous peer review process. The editorial peer review board represents three international metalcasting groups: academia (metalcasting professors), science and research (personnel from national labs, research and scientific institutions), and industry (leading technical personnel from metalcasting facilities).
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