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<p>Due to its exceptional oxidation resistance and comprehensive mechanical properties, GH3044 alloys are extensively used in the high-temperature combustion chamber components of aerospace engines. This study focused on the hot compression behavior of GH3044 alloys under isothermal conditions, with temperature ranging from 950 °C to 1150 °C and strain rates of 0.01–5 s<sup>−1</sup>. True stress–strain data were used to formulate three different constitutive models: the Arrhenius model, particle swarm optimization-backpropagation (PSO-BP) model, and physical metallurgy-modified guided data-driven (PM-MGDD) model. Subsequently, a novel processing map for three-dimensional (3D) hot deformation was established, founded on the principles of the PM-MGDD model. The mechanisms governing dynamic recrystallization (DRX) and Σ3<sup>n</sup> boundary evolution were further explored, revealing that nucleation in this alloy was primarily governed by discontinuous dynamic recrystallization (DDRX), with continuous dynamic recrystallization (CDRX) acting as an auxiliary mechanism. The recrystallized fraction exhibited a positive correlation with deformation temperature and a negative correlation with strain rate, reaching a maximum value of 97.38%. The evolution of Σ3<sup>n</sup> twin boundaries was predominantly influenced by DRX. With high temperatures and low strain rates, there was sufficient time for grain boundary migration and adequate stored energy, reaching a maximum Σ3<sup>n</sup> fraction of 45.51%.</p>

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Development of a hot processing map by PM-MGDD model and microstructural characterization of GH3044 alloy

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Yuanming Liu,
  • Fang Huang,
  • Xilong Hu,
  • Zhenhua Wang,
  • Wangzhe Du,
  • Jian Shao,
  • Laishan Yang

摘要

Due to its exceptional oxidation resistance and comprehensive mechanical properties, GH3044 alloys are extensively used in the high-temperature combustion chamber components of aerospace engines. This study focused on the hot compression behavior of GH3044 alloys under isothermal conditions, with temperature ranging from 950 °C to 1150 °C and strain rates of 0.01–5 s−1. True stress–strain data were used to formulate three different constitutive models: the Arrhenius model, particle swarm optimization-backpropagation (PSO-BP) model, and physical metallurgy-modified guided data-driven (PM-MGDD) model. Subsequently, a novel processing map for three-dimensional (3D) hot deformation was established, founded on the principles of the PM-MGDD model. The mechanisms governing dynamic recrystallization (DRX) and Σ3n boundary evolution were further explored, revealing that nucleation in this alloy was primarily governed by discontinuous dynamic recrystallization (DDRX), with continuous dynamic recrystallization (CDRX) acting as an auxiliary mechanism. The recrystallized fraction exhibited a positive correlation with deformation temperature and a negative correlation with strain rate, reaching a maximum value of 97.38%. The evolution of Σ3n twin boundaries was predominantly influenced by DRX. With high temperatures and low strain rates, there was sufficient time for grain boundary migration and adequate stored energy, reaching a maximum Σ3n fraction of 45.51%.