The linear friction welding (LFW) experiment of solid-solution strengthening Ni-base superalloy GH3044 was carried out. Microstructural examination of the joint showed that both in the weld zone (WZ) and thermomechanically affected zone (TMAZ) the grains are refined significantly and the streamlines are formed due to the rearrangement of carbides. The tensile strength of the joint is comparable to that of the base metal (BM). The EBSD results show that the joint microstructure undergoes mainly discontinuous dynamic recrystallization during LFW

accompanying with a part of continuous dynamic recrystallization and static recrystallization. As a consequence

the low-angle grain boundaries (LAGBs) increase sharply while the twin grain boundaries decrease drastically in the joint. The TMAZ has more LAGBs than WZ

because strong microtexture forms in the TMAZ while more sufficient recrystallization occurs in the WZ.