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<p>A series of experiments investigating the recrystallization (RX) mechanisms of the single-crystalline superalloy AM1 during its manufacture have been carried out. High and very high-temperature tensile tests were conducted to investigate the effect of the level of plastic deformation and the temperature at which the strain was applied. These parameters were then analyzed for their influence on RX mechanisms during the subsequent solution heat treatment. The strain threshold for RX under various temperature ranges has been determined, and it has been shown that RX is more likely to occur within the 900&#xa0;°C to 1150&#xa0;°C deformation temperature range. Some correlations between deformation mechanisms and volume fraction of <i>γ</i>′ in this type of alloy over these temperature ranges have been discussed in order to explain these trends. In addition, non-isothermal tensile tests were conducted to reproduce as closely as possible the thermomechanical path experienced during the manufacturing of single-crystalline parts using investment casting. A strong correlation has been demonstrated between the thermomechanical path followed during non-isothermal tests that lead to the appearance of recrystallized grains and the “recrystallization zone” identified from pure isothermal tests. This correlation becomes evident when the thermomechanical path crosses this zone. The effect of non-isothermal thermomechanical loading on microstructure was studied by EBSD analysis. Significant local misorientation was observed around microstructural inhomogeneities such as casting pores and eutectic/casting pore pairs. These local rotations suggest that microstructural inhomogeneities act as stress concentrators leading to the first RX nuclei once a super-solvus solution heat treatment has been applied.</p>

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Toward a Better Understanding of Recrystallization Mechanisms of Single Crystal Nickel Based Superalloys During Turbine Blades Processing

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Louise Grau,
  • Patrick Villechaise,
  • Florent Mauget,
  • Nathalie Bozzolo,
  • Besnik Sadriji,
  • Jonathan Cormier

摘要

A series of experiments investigating the recrystallization (RX) mechanisms of the single-crystalline superalloy AM1 during its manufacture have been carried out. High and very high-temperature tensile tests were conducted to investigate the effect of the level of plastic deformation and the temperature at which the strain was applied. These parameters were then analyzed for their influence on RX mechanisms during the subsequent solution heat treatment. The strain threshold for RX under various temperature ranges has been determined, and it has been shown that RX is more likely to occur within the 900 °C to 1150 °C deformation temperature range. Some correlations between deformation mechanisms and volume fraction of γ′ in this type of alloy over these temperature ranges have been discussed in order to explain these trends. In addition, non-isothermal tensile tests were conducted to reproduce as closely as possible the thermomechanical path experienced during the manufacturing of single-crystalline parts using investment casting. A strong correlation has been demonstrated between the thermomechanical path followed during non-isothermal tests that lead to the appearance of recrystallized grains and the “recrystallization zone” identified from pure isothermal tests. This correlation becomes evident when the thermomechanical path crosses this zone. The effect of non-isothermal thermomechanical loading on microstructure was studied by EBSD analysis. Significant local misorientation was observed around microstructural inhomogeneities such as casting pores and eutectic/casting pore pairs. These local rotations suggest that microstructural inhomogeneities act as stress concentrators leading to the first RX nuclei once a super-solvus solution heat treatment has been applied.