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<p>This study investigated the impact of a 4&#xa0;pct tensile strain at 800&#xa0;°C, 900&#xa0;°C, and 1000&#xa0;°C, applied between solution and aging treatments, on the time required to reach 0.2&#xa0;pct creep deformation in both single crystal (SX) and polycrystalline (PX) specimens of René 65 alloy. The microstructure was examined using scanning electron microscopy to analyze how pre-deformation (PD) influences mechanical behavior. For SX specimens oriented near the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\left[ {001} \right]\)</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="]" open="["> <mn>001</mn> </mfenced> </math></EquationSource> </InlineEquation> crystallographic direction, PD systematically reduced the time to reach 0.2&#xa0;pct creep deformation. Microstructural changes due to PD were evident only when PD was applied at 1000&#xa0;°C. No significant differences were observed at lower temperatures. For&#xa0;~&#xa0;<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\left[ {101} \right]\)</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close="]" open="["> <mn>101</mn> </mfenced> </math></EquationSource> </InlineEquation> orientated single crystal, the impact of PD varied with the pre-deformation temperature. At 800&#xa0;°C and 1000&#xa0;°C, PD resulted in strain hardening. For the PX material, the PD reduced the time to reach 0.2&#xa0;pct of deformation. The PD changes the microstructure in the vicinity of grains boundaries without significantly modifying the intragranular microstructure.</p>

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Creep Strength Dependence of a γ/γ′ Ni-Based Superalloy to the Prior Thermomechanical Processing

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Matilde Lecourt,
  • Florence Hamon,
  • Alexandre El Sabbagh,
  • Nicolas Chanfreau,
  • Michel Saby,
  • Patrick Villechaise,
  • Anne Joulain,
  • Jonathan Cormier

摘要

This study investigated the impact of a 4 pct tensile strain at 800 °C, 900 °C, and 1000 °C, applied between solution and aging treatments, on the time required to reach 0.2 pct creep deformation in both single crystal (SX) and polycrystalline (PX) specimens of René 65 alloy. The microstructure was examined using scanning electron microscopy to analyze how pre-deformation (PD) influences mechanical behavior. For SX specimens oriented near the \(\left[ {001} \right]\) 001 crystallographic direction, PD systematically reduced the time to reach 0.2 pct creep deformation. Microstructural changes due to PD were evident only when PD was applied at 1000 °C. No significant differences were observed at lower temperatures. For ~  \(\left[ {101} \right]\) 101 orientated single crystal, the impact of PD varied with the pre-deformation temperature. At 800 °C and 1000 °C, PD resulted in strain hardening. For the PX material, the PD reduced the time to reach 0.2 pct of deformation. The PD changes the microstructure in the vicinity of grains boundaries without significantly modifying the intragranular microstructure.