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<p>The effect of cyclic recovery heat treatment (CRHT) on the microstructural evolution and subsequent RX controlling in a plastically deformed single crystal superalloy CMSX-4 has been studied. The results showed that CRHT can effectively control RX, with RX being completely inhibited after three or more CRHT cycles. Microstructural observation revealed that CRHT promotes the decrease of dislocation density and the formation of stable dislocation networks at <i>γ</i>/<i>γ</i>′ interfaces. Furthermore, coarse <i>γ</i>′ precipitates in interdendritic regions coarsened progressively with an increasing number of CRHT cycles, enhancing their pinning effect on dislocation motion. Coarse <i>γ</i>′ precipitates and stable dislocation networks retarded the migration of low angle grain boundaries which may originate from the eutectics. The mechanism of RX control by CRHT was discussed based on the microstructural evolution during CRHT and short-term solution heat treatment.</p>

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Cyclic Recovery Heat Treatment to Control Recrystallization of a Single-Crystal Superalloy CMSX-4

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Ningfeng He,
  • Guang Xie,
  • Yuzhang Lu,
  • Jian Shen,
  • Yawei Li,
  • Jian Zhang

摘要

The effect of cyclic recovery heat treatment (CRHT) on the microstructural evolution and subsequent RX controlling in a plastically deformed single crystal superalloy CMSX-4 has been studied. The results showed that CRHT can effectively control RX, with RX being completely inhibited after three or more CRHT cycles. Microstructural observation revealed that CRHT promotes the decrease of dislocation density and the formation of stable dislocation networks at γ/γ′ interfaces. Furthermore, coarse γ′ precipitates in interdendritic regions coarsened progressively with an increasing number of CRHT cycles, enhancing their pinning effect on dislocation motion. Coarse γ′ precipitates and stable dislocation networks retarded the migration of low angle grain boundaries which may originate from the eutectics. The mechanism of RX control by CRHT was discussed based on the microstructural evolution during CRHT and short-term solution heat treatment.