Optimizing carbides in the carbonitrided layer of 40CrMoSi bearing steel with rare earth elements to improve its wear resistance

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International Pub Date : 2025-09-19 DOI:10.1016/j.triboint.2025.111221

Lianteng Zhang , Zhonghua Jiang , Pei Wang , Dianzhong Li

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Abstract

The microstructure of a carbonitrided layer and its wear resistance were investigated by adding Rare Earth (RE) into 40CrMoSi bearing steel. The results indicated that while the addition of RE did not increase the depth of the carbonitrided layer, it did lead to an increase in both the size and content of carbides on the surface of the carbonitrided layer, thereby significantly improving its wear resistance. The underlying mechanism is as follows: RE compounds increase carburizing efficiency, which in turn increases the surface carbon concentration. Moreover, solid-solution RE atoms delay carbon diffusion into the center of the carbonitrided layer. Consequently, the carbon content is enriched on the surface of the carbonitrided layer, resulting in an increase in carbide size and quantity. These carbides, which are distributed on the surface of the carbonitrided layer, effectively increase the resistance of the martensitic matrix to plastic deformation and reduce minor cutting phenomena, thereby significantly improving the wear resistance of RE-modified 40CrMoSi bearing steel.

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用稀土元素优化40CrMoSi轴承钢碳氮化层碳化物，提高其耐磨性

通过在40CrMoSi轴承钢中添加稀土，研究了碳化氮化层的显微组织及其耐磨性。结果表明，稀土的加入虽然没有增加碳氮化层的深度，但却增加了碳氮化层表面碳化物的尺寸和含量，从而显著提高了碳氮化层的耐磨性。其基本机理是：稀土化合物提高了渗碳效率，从而提高了表面碳浓度。固溶态稀土原子延缓了碳向碳氮化层中心的扩散。因此，碳含量在碳氮化层表面富集，导致碳化物的尺寸和数量增加。这些碳化物分布在碳氮化层表面，有效地增加了马氏体基体对塑性变形的抵抗能力，减少了微小的切削现象，从而显著提高了re改性40CrMoSi轴承钢的耐磨性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tribology International 工程技术-工程：机械

CiteScore

10.10

自引率

16.10%

发文量

627

审稿时长

35 days

期刊介绍： Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.