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.
基金资助:国家自然科学基金(51675435)。
引用本文:
石鹏涛,马铁军,李文亚,张勇,杨夏炜,肖遥. GH3044 线性摩擦焊接头组织特征及其形成机制[J]. 航空制造技术, 2019, 62(9): 80-84.
SHI Pengtao, MA Tiejun, LI Wenya, ZHANG Yong, YANG Xiawei, XIAO Yao. Microstructure Feature and Its Forming Mechanism of Linear Friction Welded GH3044 Joint. Aeronautical Manufacturing Technology, 2019, 62(9): 80-84.