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<p>By means of cold ring rolling (CRR), isothermal quenching and tempering treatments, microstructure observation, and mechanical-property tests, the effects of CRR on the heat treatment microstructure and wear resistance of GCr15 bearing steel were studied. The results showed that the carbides in GCr15 bearing steel before heat treatment were refined by CRR, promoting their dissolution during solution treatment. Carbides in the CRR samples were finer and more numerous, promoting the formation of acicular lower bainite. Consequently, a small amount of bainite appeared in the microstructure of the CRR samples during the early stages (20&#xa0;min) of isothermal treatment. When the isothermal treatment was over 30&#xa0;min, CRR significantly enhanced the tempering hardness of GCr15 bearing steel by promoting carbide precipitation, and suppressed the coarsening of undissolved carbides during both isothermal holding and subsequent tempering, thereby improving the hardness and wear resistance of GCr15 bearing steel. Specifically, the CRR sample subjected to 60&#xa0;min of isothermal treatment exhibited the highest hardness (766.12 HV<sub>1</sub>) and optimal wear resistance, with the wear rate as low as 5.09 × 10<sup>-5</sup>&#xa0;mg/(N·m).</p>

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The Influence of Cold Ring Rolling on the Microstructure and Wear Resistance of GCr15 Bearing Steel with Different Isothermal Treatment Times

  • 期刊论文

  • 发表日期：

    2026年2月10日

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  • Hao Tianci,
  • Peng Hongci,
  • Zhang Mingfeng,
  • Wei Yinghua,
  • Su Yong,
  • Yu Xingfu

摘要

By means of cold ring rolling (CRR), isothermal quenching and tempering treatments, microstructure observation, and mechanical-property tests, the effects of CRR on the heat treatment microstructure and wear resistance of GCr15 bearing steel were studied. The results showed that the carbides in GCr15 bearing steel before heat treatment were refined by CRR, promoting their dissolution during solution treatment. Carbides in the CRR samples were finer and more numerous, promoting the formation of acicular lower bainite. Consequently, a small amount of bainite appeared in the microstructure of the CRR samples during the early stages (20 min) of isothermal treatment. When the isothermal treatment was over 30 min, CRR significantly enhanced the tempering hardness of GCr15 bearing steel by promoting carbide precipitation, and suppressed the coarsening of undissolved carbides during both isothermal holding and subsequent tempering, thereby improving the hardness and wear resistance of GCr15 bearing steel. Specifically, the CRR sample subjected to 60 min of isothermal treatment exhibited the highest hardness (766.12 HV1) and optimal wear resistance, with the wear rate as low as 5.09 × 10-5 mg/(N·m).