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<p>The key to extending the service life of die steel lies in resolving the issue of its thermal fatigue. In this study, titanium microalloying technology was employed to improve the thermal fatigue resistance of die steel. The thermal fatigue behaviors of Ti-containing and Ti-free die steels were compared using the self-restrained thermal fatigue test method. The extent of thermal fatigue damage was quantitatively evaluated by means of the thermal fatigue damage factor, and the mechanism through which Ti improves the thermal fatigue resistance of die steel was revealed. The results indicate that the resistance to thermal fatigue crack initiation and propagation of Ti-containing steel is superior to that of Ti-free steel. After 2500 thermal fatigue cycles, the surface and cross-sectional damage of the Ti-free steel&#xa0;was extremely severe, whereas the extent of damage to the surface and cross section of the Ti-containing steel was relatively mild. The damage factor of the former exceeds that of the latter by one order of magnitude. The thermal fatigue crack propagation rate in the Ti-free steel is much faster than that in the Ti-containing steel. The addition of Ti results in the formation of dispersed and small-sized TiC, which exhibits excellent thermal stability. The coarsening degree of TiC during thermal fatigue is much lower than that of carbides in the Ti-free steel. The TiC particles remain relatively small and dispersed after thermal fatigue, ensuring the sustained operation of Orowan strengthening and thereby significantly enhancing the thermal fatigue resistance of the die steel.</p>

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Research on the Thermal Fatigue Behavior and Anti-Thermal Fatigue Mechanism of Titanium Microalloyed Die Steel

  • 期刊论文

  • 发表日期：

    2026年4月11日

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  • Jian Sun,
  • Tan Sun,
  • Qinghua Song,
  • Jin Du,
  • Qian Zhao,
  • Shiyu Cao

摘要

The key to extending the service life of die steel lies in resolving the issue of its thermal fatigue. In this study, titanium microalloying technology was employed to improve the thermal fatigue resistance of die steel. The thermal fatigue behaviors of Ti-containing and Ti-free die steels were compared using the self-restrained thermal fatigue test method. The extent of thermal fatigue damage was quantitatively evaluated by means of the thermal fatigue damage factor, and the mechanism through which Ti improves the thermal fatigue resistance of die steel was revealed. The results indicate that the resistance to thermal fatigue crack initiation and propagation of Ti-containing steel is superior to that of Ti-free steel. After 2500 thermal fatigue cycles, the surface and cross-sectional damage of the Ti-free steel was extremely severe, whereas the extent of damage to the surface and cross section of the Ti-containing steel was relatively mild. The damage factor of the former exceeds that of the latter by one order of magnitude. The thermal fatigue crack propagation rate in the Ti-free steel is much faster than that in the Ti-containing steel. The addition of Ti results in the formation of dispersed and small-sized TiC, which exhibits excellent thermal stability. The coarsening degree of TiC during thermal fatigue is much lower than that of carbides in the Ti-free steel. The TiC particles remain relatively small and dispersed after thermal fatigue, ensuring the sustained operation of Orowan strengthening and thereby significantly enhancing the thermal fatigue resistance of the die steel.