To broaden the applications of Hastelloy X superalloy manufactured by laser directed energy deposition (DED-L), ultrasonic micro-forge treatment (UMT) assisted DED-L was developed to print Hastelloy X components with improved mechanical properties. In this study, the residual stress and mechanical properties of the non-UMT- and UMT-treated samples are compared, and the microstructure was examined to reveal the root cause. During additive manufacturing, the sample structure recrystallized from columnar grains to equiaxial grains, which exhibited much finer structures after UMT. The impact toughness, ductility, tensile strength, and microhardness of the superalloy increased after UMT. During the UMT process, the dislocation pileups appeared and offered hinderance to the dislocations moving within it, thereby improving the mechanical strengthening of the Hastelloy X superalloy.

为了拓宽通过激光定向能量沉积 (DED-L) 制造的 Hastelloy X 高温合金的应用，开发了超声波微锻造处理 (UMT) 辅助 DED-L 以打印具有改进机械性能的 Hastelloy X 部件。在这项研究中，比较了未经 UMT 和 UMT 处理的样品的残余应力和机械性能，并检查了微观结构以揭示根本原因。在增材制造过程中，样品结构从柱状晶粒重结晶为等轴晶粒，在 UMT 后表现出更精细的结构。UMT后高温合金的冲击韧性、延展性、拉伸强度和显微硬度均有所提高。在 UMT 过程中，位错堆积出现并阻碍位错在其中移动，