CAJ | 학술논문

利用透射电子显微镜和能谱,研究电子束焊接过程中Ti_2AlNb基合金显微组织演变过程以及焊缝区组成、焊后热处理对接头显微组织的影响.结果表明:焊接过程中焊缝区Al元素损失较为严重,这有利于B_2相的形成而不利于O相的形成,使得接头焊缝区主要由B_2和α_2两相组成;在随后的热处理过程中,焊缝区的B_2相转变为β相和板条状的O相,使焊缝区由α_2、O和β相组成.
이용투사전자현미경화능보,연구전자속한접과정중Ti_2AlNb기합금현미조직연변과정이급한봉구조성、한후열처리대접두현미조직적영향.결과표명:한접과정중한봉구Al원소손실교위엄중,저유리우B_2상적형성이불리우O상적형성,사득접두한봉구주요유B_2화α_2량상조성;재수후적열처리과정중,한봉구적B_2상전변위β상화판조상적O상,사한봉구유α_2、O화β상조성.
The microstructure and composition of Ti_2AlNb joints fabricated by electron beam welding technique were investigated by transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS). The effect of the composition of the welded zone and heat treatment after welding on the microstructure of the joint was also studied. Results showed that there was a great weight loss of Al element in the joint during welding, which was beneficial to the formation of B_2 phase but O phase. The as-welded joint was composed of B_2 and α_2 phases, while the joint after heat treatment was of α_2, O and β phases, which indicated that the following phase transformation of B_2 to β and O occurred.