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<p>The influence of heat treatment processes and the addition of rare earth (RE) elements on the microstructure evolution and friction-wear properties of GCr15 bearing steel were investigated in this paper. The GCr15 bearing steels with three different RE contents (0, 0.003&#xa0;wt.%, and 0.015&#xa0;wt.%) were used and three heat treatment processes, quenching and tempering, isothermal bainitic treatment, and complete bainitic treatment were conducted. The microstructure was characterized by methods of SEM and TEM. The hardness and friction-wear properties were tested. The results show that the introduction of RE elements significantly refines the microstructure, effectively refines the inclusion, and changes the types of inclusions, transforming them from coarse and irregular shapes to fine and sphere RE-Al-O and RE-O type inclusions. RE elements also promote the nucleation of bainite and increase the bainite transformation rate by reducing the interfacial energy. For friction-wear properties, as the content of RE increases, the average friction coefficient at different heat treatment processes shows a stepwise decline and the wear weight is reduced. Especially after the complete bainitic treatment, the wear weight of the R150 sample is more than 70% lower than that of the sample without adding RE. Based on the Archard wear model, the friction-wear behavior under different heat treatment process was predicted.</p>

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Effect of Heat Treatment on Microstructure Evolution and Friction-Wear Properties of Rare Earth Bearing Steel

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Dianzuo Shang,
  • Di Zhang,
  • Chao Liu,
  • Hui Li,
  • Shuhao Zhou,
  • Longxin Liu,
  • Jiyu Wang

摘要

The influence of heat treatment processes and the addition of rare earth (RE) elements on the microstructure evolution and friction-wear properties of GCr15 bearing steel were investigated in this paper. The GCr15 bearing steels with three different RE contents (0, 0.003 wt.%, and 0.015 wt.%) were used and three heat treatment processes, quenching and tempering, isothermal bainitic treatment, and complete bainitic treatment were conducted. The microstructure was characterized by methods of SEM and TEM. The hardness and friction-wear properties were tested. The results show that the introduction of RE elements significantly refines the microstructure, effectively refines the inclusion, and changes the types of inclusions, transforming them from coarse and irregular shapes to fine and sphere RE-Al-O and RE-O type inclusions. RE elements also promote the nucleation of bainite and increase the bainite transformation rate by reducing the interfacial energy. For friction-wear properties, as the content of RE increases, the average friction coefficient at different heat treatment processes shows a stepwise decline and the wear weight is reduced. Especially after the complete bainitic treatment, the wear weight of the R150 sample is more than 70% lower than that of the sample without adding RE. Based on the Archard wear model, the friction-wear behavior under different heat treatment process was predicted.