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HE Jianchao, ZHANG Tiancang, LI Ju. Effect of heat treatment on microstructure and hardness of Ti2AlNb linear friction welding joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(4): 119-124. DOI: 10.12073/j.hjxb.2019400111
Citation: HE Jianchao, ZHANG Tiancang, LI Ju. Effect of heat treatment on microstructure and hardness of Ti2AlNb linear friction welding joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(4): 119-124. DOI: 10.12073/j.hjxb.2019400111
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Effect of heat treatment on microstructure and hardness of Ti2AlNb linear friction welding joint

  • Aeronautical Key Laboratory for Welding and Joining Technologies, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China

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  • Received Date: December 14, 2017
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  • Linear friction welding (LFW) test and post-weld heat treatment of welded joints of Ti2AlNb alloy were carried out. The microstructure evolution in recrystallization zone and thermo-mechanical affected zone of Ti2AlNb LFW joint with post heat treatment were analyzed. The results showed that high quality joint of Ti2AlNb without microcrack and microvoid could be formed by LFW. WZ (weld zone) consisted of metastable β phase and few of twisted α2. TMAZ was made of O phase, metastable β phase and much of twisted α2 phase. After heat treatment, metastable β broke down into O lamina precipitate and the size of O lamina increased with the temperature from 700 °C to 900 °C. Microhardness increased obviously after heat treatment at 700 °C while it decreased with the increasing of temperature.
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