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<p>In order to reduce the cost of wind power generation, it is necessary to improve the operation scale of the unit, and one of the key factors restricting the service life of the wind power equipment is the performance and service life of the bearing. In this paper, the steel 42CrMo used for wind power yaw bearing ring is used for three times, four times, and five times of cyclic heating–quenching process (oil quenching 860&#xa0;°C for 2min) and conventional heat treatment (spheroidizing annealing 750&#xa0;°C for 1h +Heat to 850&#xa0;°C, hold for 1 hour, and then oil quenching+ tempering 630&#xa0;°C for 2h). The heat preservation time was 2h. The results show that the surface microhardness of the samples after cyclic quenching heat treatment is higher than that after conventional heat treatment, and the maximum value is 28.2% after five times of cyclic quenching; the surface friction coefficient of the samples after five times of cyclic quenching heat treatment is the maximum value, which is 0.80. More thermal cycles lead to an increased density of microdefects within the crystal, which in turn raises the dislocation density in the lattice-distorted regions, thereby increasing the hardness. After three, four and five times of heat treatment, the wear rate is lower than that of conventional heat treatment, and the wear resistance of three times of cycle quenching is the best, which is increased by 40.1%.</p>

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Effect of Cyclic Quenching on Hardness and Wear Resistance of 42CrMo Steel

  • 期刊论文

  • 发表日期：

    2026年2月21日

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  • Chen Suwen,
  • Liu SongHao,
  • Yuan Xingxing,
  • Ding Wenjie,
  • Sun Jianliang

摘要

In order to reduce the cost of wind power generation, it is necessary to improve the operation scale of the unit, and one of the key factors restricting the service life of the wind power equipment is the performance and service life of the bearing. In this paper, the steel 42CrMo used for wind power yaw bearing ring is used for three times, four times, and five times of cyclic heating–quenching process (oil quenching 860 °C for 2min) and conventional heat treatment (spheroidizing annealing 750 °C for 1h +Heat to 850 °C, hold for 1 hour, and then oil quenching+ tempering 630 °C for 2h). The heat preservation time was 2h. The results show that the surface microhardness of the samples after cyclic quenching heat treatment is higher than that after conventional heat treatment, and the maximum value is 28.2% after five times of cyclic quenching; the surface friction coefficient of the samples after five times of cyclic quenching heat treatment is the maximum value, which is 0.80. More thermal cycles lead to an increased density of microdefects within the crystal, which in turn raises the dislocation density in the lattice-distorted regions, thereby increasing the hardness. After three, four and five times of heat treatment, the wear rate is lower than that of conventional heat treatment, and the wear resistance of three times of cycle quenching is the best, which is increased by 40.1%.