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<p>The interaction of plastic flow and microstructure evolution during continuous heating of superalloy Haynes 282 sheet was quantified using constant-stress, constant-heating-rate (CSCHR) tests coupled with simulations of precipitation and dissolution. Prior to deformation, sheet samples were supersolvus solution treated and furnace cooled or oil quenched, thereby producing a microstructure comprising equiaxed γ grains with or without <i>γ′</i> precipitates, respectively. CSCHR test parameters consisted of stresses in the range of 121 to 414&#xa0;MPa and heating rates of 75 or 28&#xa0;°C/min. In all cases, plastic flow was characterized by a strain rate which increased with temperature. The Arrhenius plots derived from such measurements showed nearly-linear or bi-linear behaviors whose slopes increased with temperature <i>below</i> the nominal equilibrium <i>γ′</i> solvus and then decreased <i>above</i> the solvus. The effect of dislocation-precipitate interactions on plastic flow was quantified using precipitation/dissolution simulations and estimates of the instantaneous threshold stress derived from comparisons of Arrhenius plots for single-phase and two-phase behaviors. Such comparisons revealed that plastic-flow was limited by the climb of dislocations over the <i>γ′</i> precipitates.</p>

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High-Temperature Plastic Flow of Haynes 282 Under Continuous-Heating Conditions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月9日

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  • S. L. Semiatin,
  • N. C. Levkulich,
  • B. W. McArthur,
  • M. E. Krug

摘要

The interaction of plastic flow and microstructure evolution during continuous heating of superalloy Haynes 282 sheet was quantified using constant-stress, constant-heating-rate (CSCHR) tests coupled with simulations of precipitation and dissolution. Prior to deformation, sheet samples were supersolvus solution treated and furnace cooled or oil quenched, thereby producing a microstructure comprising equiaxed γ grains with or without γ′ precipitates, respectively. CSCHR test parameters consisted of stresses in the range of 121 to 414 MPa and heating rates of 75 or 28 °C/min. In all cases, plastic flow was characterized by a strain rate which increased with temperature. The Arrhenius plots derived from such measurements showed nearly-linear or bi-linear behaviors whose slopes increased with temperature below the nominal equilibrium γ′ solvus and then decreased above the solvus. The effect of dislocation-precipitate interactions on plastic flow was quantified using precipitation/dissolution simulations and estimates of the instantaneous threshold stress derived from comparisons of Arrhenius plots for single-phase and two-phase behaviors. Such comparisons revealed that plastic-flow was limited by the climb of dislocations over the γ′ precipitates.