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GH2132, an Ni–Cr–Fe-based superalloy for aero-engine components, exhibits hot workability that is highly sensitive to processing parameters. The hot deformation behavior of GH2132 alloy was investigated via isothermal compression (Gleeble-3500-GTC) over 850–1100 °C and 0.001–10 s−1, combined with optical microscopy and EBSD characterization. A strain-compensated Arrhenius-type hyperbolic-sine model was established, achieving high predictive accuracy (R2 = 0.9916; AARE = 3.86%) with an average activation energy Q = 446.2 kJ·mol−1. Flow stress decreases with increasing temperature and increases with strain rate, while microstructural softening transitions from dynamic recovery to complete dynamic recrystallization at higher temperatures and lower strain rates. Three-dimensional power-dissipation and hot-processing maps (Dynamic Materials Model) delineate safe domains and instability regions, identifying an optimal window of 1000–1100 °C at 0.001–0.01 s−1 and instability at 850–900 °C with 0.01–0.1 s−1. These results provide guidance for selecting parameters for hot deformation behavior during thermomechanical processing of GH2132.
Details
Cooling;
Investigations;
Oxidation;
Parameter sensitivity;
Temperature;
Thermomechanical treatment;
Energy dissipation;
Constitutive models;
Deformation;
Dynamic recrystallization;
Working conditions;
Microscopy;
Homogenization;
Process mapping;
Hot workability;
Ferrous alloys;
Stress concentration;
Superalloys;
Engine components;
Optical microscopy;
Process parameters;
Yield strength
1 China Productivity Center for Machinery, China Academy of Machinery Science and Technology, Beijing 100044, China; [email protected] (Y.S.);, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
2 China Productivity Center for Machinery, China Academy of Machinery Science and Technology, Beijing 100044, China; [email protected] (Y.S.);