Abstract Mechanical performance of hot forming products is strongly related to microstructures and deformation behaviors during hot processing. Through dynamic recrystallization (DRX) kinetics analysis and simulation, evolution of microstructure and hot-compressive behavior of a solution-treated GH4169 superalloy at different deformation conditions were investigated. The DRX behavior confirmed by microstructure observations was promoted at higher temperatures and lower strain rates. No δ phase existed at or above 1333 K deformation temperature. Flow softening extent became more significant under lower temperatures and strain rates during compression where DRX played a dominate role in the softening behavior. A dramatic yield drop occurred within the temperature range varying from 1273 K to 1333 K due to the dissolution of δ phase and enhanced mobility of defects. The DRX kinetics model was established to calculate the volume fraction and grain size of DRX under the investigated deformation parameters. Additionally, the relationships between microstructure and deformation behavior as well as mechanical property were discussed. Excellent correlation showed a possibility of controlling microstructure and mechanical properties by selecting suitable deformation parameters. Finally, the microstructure of GH4169 superalloy in terms of grain size after hot compression was successfully predicted by finite element model integrated with the developed kinetics equations implying the excellent applicability of such model for the current study and great potential for practical applications on predicting the mechanical properties of GH4169 alloy after hot working.

中文翻译：

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通过动力学分析和模拟表征 GH4169 高温合金的微观结构和热压缩行为

摘要 热成型产品的力学性能与热加工过程中的显微组织和变形行为密切相关。通过动态再结晶 (DRX) 动力学分析和模拟，研究了固溶处理的 GH4169 高温合金在不同变形条件下的微观结构和热压缩行为的演变。通过微观结构观察证实的 DRX 行为在更高的温度和更低的应变率下得到促进。在 1333 K 变形温度或以上不存在 δ 相。在压缩过程中，在较低的温度和应变速率下，流动软化程度变得更加显着，其中 DRX 在软化行为中起主导作用。由于 δ 相的溶解和缺陷迁移率的增强，在 1273 K 到 1333 K 的温度范围内发生了显着的产量下降。建立DRX动力学模型，计算变形参数下DRX的体积分数和晶粒尺寸。此外，还讨论了微观结构与变形行为以及力学性能之间的关系。良好的相关性表明通过选择合适的变形参数可以控制微观结构和机械性能。最后，