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To explore the influence of Mo content on the high-temperatureTemperature strengthStrength of brake disc steelBrake disc steel, the high-temperatureTemperature strengthsStrength of the three steelsSteel containing 0.64–1.03% Mo were studied. The strengthStrength from room temperatureTemperature to 600 °C exhibited a strong dependence on Mo content. When the Mo contents increased from 0.64 to 1.03%, the yield strengthStrength improved from 1166 to 1217 MPa at room temperatureTemperature and from 512 to 638 MPa at 600 °C. Their elongations of steelsSteel significantly increased over 400 °C. The fractureFracture morphology at room temperatureTemperature was tearing ridges and ductile dimples, and the high-temperatureTemperature fractureFracture was large ductile dimples. The Electron Backscatter Diffraction (EBSD) analysis showed that the average grain sizesAverage grain size for the steelsSteel with different Mo contents were 5.13 μm, 4.97 μm, and 4.05 μm, respectively. The Mo element enhanced high-temperatureTemperature strengthStrength primarily by refining the grain structure and hindering crack propagationCrack propagation.

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Effect of Mo Content on the Microstructure and High-Temperature Strength of the Brake Discs Steel for High-Speed Trains

  • 会议论文

  • 发表日期：

    2026年

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  • Liangji Yu,
  • Fuming Wang

摘要

To explore the influence of Mo content on the high-temperatureTemperature strengthStrength of brake disc steelBrake disc steel, the high-temperatureTemperature strengthsStrength of the three steelsSteel containing 0.64–1.03% Mo were studied. The strengthStrength from room temperatureTemperature to 600 °C exhibited a strong dependence on Mo content. When the Mo contents increased from 0.64 to 1.03%, the yield strengthStrength improved from 1166 to 1217 MPa at room temperatureTemperature and from 512 to 638 MPa at 600 °C. Their elongations of steelsSteel significantly increased over 400 °C. The fractureFracture morphology at room temperatureTemperature was tearing ridges and ductile dimples, and the high-temperatureTemperature fractureFracture was large ductile dimples. The Electron Backscatter Diffraction (EBSD) analysis showed that the average grain sizesAverage grain size for the steelsSteel with different Mo contents were 5.13 μm, 4.97 μm, and 4.05 μm, respectively. The Mo element enhanced high-temperatureTemperature strengthStrength primarily by refining the grain structure and hindering crack propagationCrack propagation.