Thermomechanical processes, such as forging, are important steps during manufacturing of superalloy components. The microstructural development during processing, which controls the final component properties, is complex and depends on e.g., applied strain, strain rate and temperature. In this study, we investigate the effect of process parameters on the dynamic and post-dynamic recrystallization during hot compression of Ni-base superalloy Haynes 282. Specifically, we address the effect of deformation below the grain boundary carbide solvus temperature. During deformation, discontinuous and continuous dynamic recrystallization was observed at the grain boundaries, and particle-stimulated nucleation occurred at primary carbides. Strain rate was determined to be the governing factor controlling the recrystallization fraction for strain rates up to 0.5 s${}^{-1}$ above which adiabatic heating became the dominating factor. Careful examination of the temperature development during deformation showed that the response of the closed-loop temperature control system to adiabatic heating can have important effects on the interpretation of the observed behavior. During a 90 s post-deformation hold, grain growth and an increasing fraction of twin boundaries significantly changed the deformation-induced microstructure and texture. The microstructure developed during post-dynamic recrystallization was mainly controlled by the temperature and only weakly coupled to the prior deformation step.

中文翻译：

---

次生碳化物溶解度以下的Haynes 282的动态和动态后重结晶

热机械过程（例如锻造）是制造高温合金零件过程中的重要步骤。在加工过程中，控制最终部件性能的微结构发展是复杂的，并取决于例如施加的应变，应变速率和温度。在这项研究中，我们研究了工艺参数对Ni基高温合金Haynes 282热压缩过程中动态和动态后再结晶的影响。特别是，我们解决了在晶界碳化物固溶温度以下变形的影响。在变形过程中，在晶界观察到不连续和连续的动态再结晶，并且在初级碳化物处发生了颗粒刺激的形核。${}^{-\mathrm{1个}}$在此之上，绝热加热成为主要因素。仔细检查变形过程中的温度发展情况表明，闭环温度控制系统对绝热加热的响应可能会对所观察到的行为的解释产生重要影响。在变形后的90 s内，晶粒长大和孪晶边界的增加显着改变了变形引起的微观结构和织构。动态再结晶过程中形成的微观结构主要受温度控制，并且仅与先前的变形步骤弱耦合。