Thermal deformation behavior of a Ni-Cr-Fe superalloy billet were investigated by hot compression experiments under temperatures of 900–1200 °C and strain rates of 0.001–1 s−1, and the corrosion properties of the superalloy after thermal deformation were also evaluated by electrochemical tests. Compression experiments determined that lower strain rates and higher temperatures reduce the superalloy's stress levels. The Arrhenius-type model accurately described the thermal deformation behavior of the superalloy. Furthermore, the optimal hot working domain was identified between 1120 and 1170 °C and strain rates of 0.001–0.01 s−1. Microstructure observations showed that the dynamic recrystallization (DRX), characterized by grain boundary bending nucleation and consumption of numerous dislocations is the main mechanism leading to grain refinement during thermal deformation. The results of the electrochemical corrosion tests proved that the corrosion predominantly occurred near the grain boundaries (GBs) of deformed grains, worsening with increased deformation temperatures.

中文翻译：

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Ni-Cr-Fe高温合金的热变形行为及其对耐蚀性的影响：应变速率和温度影响的综合分析


通过热压缩实验研究了 Ni-Cr-Fe 高温合金坯料在 900~1200 °C 温度和 0.001~1 s−1 应变速率下的热变形行为，并评估了热变形后高温合金的腐蚀性能通过电化学测试。压缩实验表明，较低的应变率和较高的温度可以降低高温合金的应力水平。阿伦尼乌斯型模型准确地描述了高温合金的热变形行为。此外，最佳热加工范围确定在 1120 至 1170 °C 之间，应变率为 0.001–0.01 s−1。微观结构观察表明，以晶界弯曲成核和大量位错消耗为特征的动态再结晶（DRX）是热变形过程中导致晶粒细化的主要机制。电化学腐蚀测试的结果证明，腐蚀主要发生在变形晶粒的晶界（GB）附近，并且随着变形温度的升高而恶化。