In this investigation, the superalloy IN718 has been prepared by additive manufacturing (AM) following a selective laser melting technique, and the post-AM heat treatments have been optimized. The microstructure of additively manufactured (AM) IN718 is characterized by the presence of dendritic and cellular features with large spatial heterogeneity along and across the build plane. Along the build direction, the 〈100〉 fiber texture dominates. Heat treatment involving two-step solution treatment, and subsequently, two-step aging treatment was specifically designed to facilitate the precipitation of δ phase at the grain boundaries to make the material resistant to grain boundary sliding (GBS). The AM IN718 showed dynamic strain aging (DSA) at three different temperatures, while the critical strain for the onset of serration was extended to a higher value after the heat treatment.

在这项研究中，超级合金IN718是根据选择性激光熔化技术通过增材制造（AM）制备的，并且对AM后的热处理进行了优化。增材制造（AM）IN718的微观结构的特征是存在树枝状和细胞状特征，这些特征沿构造平面和整个构造平面具有较大的空间异质性。沿着构建方向，<100>纤维纹理占主导地位。经过专门设计的热处理包括两步固溶处理，然后进行两步时效处理，以促进δ相在晶界的析出，从而使材料具有抗晶界滑动性（GBS）。AM IN718在三种不同温度下均表现出动态应变时效（DSA），