Cold-rolled Inconel 718 with a reduction of 84% exhibited excellent superplasticity at 950 °C with a high strain rate, which improves forming efficiency and reduces device dependency. The elongation to failure of 325% was obtained at a strain rate of 1 × 10⁻² s⁻¹. The ductility enhancement is attributed to the rapid atomic diffusion caused by dense dislocations and the grain refinement through recrystallization induced by cold rolling in the early deformation stage. Dislocation creep dominates the subsequent stretching process, accompanied by continuous dynamic recrystallization resulting from the transition of the accumulated dislocations into high-angle boundaries. The δ phase particles, which gradually coarsen and homogenize during deformation, promote recrystallization and hinder the dislocation motion. The cavities introduced by NbC particles primarily determine the material fracture. The present results provide a promising approach for developing superplastic superalloys adapted to high strain rates.

减少 84% 的冷轧 Inconel 718 在 950°C 下表现出优异的超塑性和高应变率，从而提高了成型效率并降低了器件依赖性。^{在 1 × 10 -2} s ^-1的应变速率下获得 325% 的断裂伸长率. 延展性增强归因于致密位错引起的快速原子扩散和变形早期冷轧引起的再结晶细化晶粒。位错蠕变在随后的拉伸过程中占主导地位，伴随着由累积的位错转变为高角边界引起的连续动态再结晶。δ相颗粒在变形过程中逐渐粗化和均匀化，促进再结晶并阻碍位错运动。NbC 颗粒引入的空腔主要决定了材料的断裂。目前的结果为开发适应高应变率的超塑性高温合金提供了一种有前景的方法。