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<p>The melting and solidification process of DZ411 superalloy at different cooling rates (50, 200, 500 °C/min) was observed in situ by high-temperature confocal laser scanning microscopy. The solidification behaviour of this alloy was also studied through other methods such as differential scanning calorimetry and scanning electron microscopy. The results show that the precipitation sequence of the main phases during the solidification of DZ411 alloy is γ matrix phase, carbide phase and Laves phase. Besides, during the solidification process of DZ411 alloy, both the dendrite thickness and dendrite spacing decreased with the increasing of cooling rate. In addition, a large amount of Ta is enriched in the dendrite stems at the end of solidification, which is the main reason for the formation of Laves phase. As the cooling rate increases, the size of the Laves phase becomes smaller and the distribution becomes more dispersed, which effectively inhibits the segregation of the alloy.</p>

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In situ observation of melting and solidification process of DZ411 superalloy

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Yi-fan Ma,
  • Peng Peng,
  • Yuan-li Xu,
  • Xu-dong Zhang,
  • Zhi-kun Ma,
  • Lian-wen Wang,
  • Xin-li Kou

摘要

The melting and solidification process of DZ411 superalloy at different cooling rates (50, 200, 500 °C/min) was observed in situ by high-temperature confocal laser scanning microscopy. The solidification behaviour of this alloy was also studied through other methods such as differential scanning calorimetry and scanning electron microscopy. The results show that the precipitation sequence of the main phases during the solidification of DZ411 alloy is γ matrix phase, carbide phase and Laves phase. Besides, during the solidification process of DZ411 alloy, both the dendrite thickness and dendrite spacing decreased with the increasing of cooling rate. In addition, a large amount of Ta is enriched in the dendrite stems at the end of solidification, which is the main reason for the formation of Laves phase. As the cooling rate increases, the size of the Laves phase becomes smaller and the distribution becomes more dispersed, which effectively inhibits the segregation of the alloy.