Abstract Control of splat thickness in an electrospark deposition (ESD) process can be used to improve the mechanical properties of deposited Inconel 718. The lower cooling rates of thicker deposition splats obtained through higher energy ESD parameters result in greater subgrain coarsening and lower microhardness. A subgrain growth model and Hall-Petch relationship are used to quantify the extent of subgrain coarsening and the influence of splat thickness on hardness, with a 4.5 times reduction in splat thickness achieving a 20% increase in microhardness.

中文翻译：

---

镍高温合金电火花沉积快速凝固的枝晶粗化模型

摘要 在电火花沉积 (ESD) 工艺中控制碎片厚度可用于改善沉积 Inconel 718 的机械性能。通过更高能量 ESD 参数获得的较厚沉积碎片的较低冷却速率导致更大的亚晶粒粗化和更低的显微硬度。亚晶粒生长模型和 Hall-Petch 关系用于量化亚晶粒粗化的程度和薄片厚度对硬度的影响，薄片厚度减少 4.5 倍，显微硬度增加 20%。