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<p>The microstructures and properties of DD32 nickel-based single-crystal superalloy with varying revert ratios were investigated by OM, SEM, EPMA, and XCT. The results indicated that as the increase in revert ratio, the content of Si and Zr increased. The primary dendrite arm spacing (PDAS), segregation between dendrite cores and interdendrite regions, the counts of γ/γ′ eutectic, and porosity all increased with increasing revert ratio. Chinese-script MC carbides displayed edge coarsening; a small number of refractory-rich strip-like precipitates and Zr-rich low melting precipitates were observed near γ/γ′ eutectic structures. After heat treatment, the morphology of MC carbides transformed from Chinese script into granular. The stress rupture life decreased with increasing revert ratio at 1000&#xa0;°C/280&#xa0;MPa, with carbides and porosities acting as the primary crack initiation, exhibiting ductile fracture characteristics dominated by porosity coalescence. According to the relationship between microstructure and performance, the proportion of revert addition should not exceed 50 percent.</p>

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Effect of Revert Addition on Microstructures and Stress Rupture Properties of a Nickel-Based Single-Crystal Superalloy

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Maokai Chen,
  • Jun Xie,
  • Jinjiang Yu,
  • Hao Wu,
  • Lirong Liu,
  • Guichen Hou,
  • Jinguo Li,
  • Jingjing Liang,
  • Yizhou Zhou

摘要

The microstructures and properties of DD32 nickel-based single-crystal superalloy with varying revert ratios were investigated by OM, SEM, EPMA, and XCT. The results indicated that as the increase in revert ratio, the content of Si and Zr increased. The primary dendrite arm spacing (PDAS), segregation between dendrite cores and interdendrite regions, the counts of γ/γ′ eutectic, and porosity all increased with increasing revert ratio. Chinese-script MC carbides displayed edge coarsening; a small number of refractory-rich strip-like precipitates and Zr-rich low melting precipitates were observed near γ/γ′ eutectic structures. After heat treatment, the morphology of MC carbides transformed from Chinese script into granular. The stress rupture life decreased with increasing revert ratio at 1000 °C/280 MPa, with carbides and porosities acting as the primary crack initiation, exhibiting ductile fracture characteristics dominated by porosity coalescence. According to the relationship between microstructure and performance, the proportion of revert addition should not exceed 50 percent.