Effect of Heat Treatment on Linear Friction Welding Joints of TC17 Titanium Alloys with Dissimilar Microstructures
CHANG Chuanchuan1,2,*, LI Ju1,2, LI Xiaohong1,2, JIN Junlong1,2, ZHANG Chuanchen1,2, JI Yajuan1,2
1 Aeronautical Key Laboratory for Welding and Joining Technologies, AVIC Manufacturing Technology Institute, Beijing 100024, China 2 Beijing Friction Welding Technology and Equipment Engineering Center, Beijing 100024, China
Abstract: This work presented the influences of the heat treatment on the microstructure, residual stress and mechanical properties of the linear friction welding joint through carrying out linear friction welding (LFW) and post-weld heat treatment (PWHT) tests on TC17 (α+β) and TC17 (β) titanium alloys, observing and analyzing the microstructure changes of the joint by optical microscope (OM) as well as scanning electron microscope (SEM) and testing the residual stress distribution of the joint by the contour method. The results showed that phase transition and dynamic recrystallization process occurred during the welding process, and the metastable β phase was formed in weld zone. The primary α phase of the thermo-mechanically affected zone (TMAZ) on both sides was severely deformed, and the needle-like α phase was completely dissolved. After PWHT, the metastable β phase was decomposed into stable α+β phase, the lath α phase precipitating at the grain boundary and needle-like α phase within the grains could be found, and the deformed α phase was decomposed. The residual stress of the joint tested by contour method has a bimodal distribution along the vibration direction. The peak tensile stress located on the TMAZ of the joint reached about 360 MPa, and the tensile stress value at the weld center reduced to 140 MPa. The residual stress value of the joint was reduced to less than 50 MPa after PWHT. When the process of PWHT was finished, the microstructure of the joint was more uniform, and the residual stress of the joint was eliminated, so that the tensile and fatigue properties of the joint were significantly improved.
常川川, 李菊, 李晓红, 金俊龙, 张传臣, 季亚娟. 热处理对同质异态TC17钛合金线性摩擦焊接头的影响[J]. 材料导报, 2024, 38(8): 22080152-5.
CHANG Chuanchuan, LI Ju, LI Xiaohong, JIN Junlong, ZHANG Chuanchen, JI Yajuan. Effect of Heat Treatment on Linear Friction Welding Joints of TC17 Titanium Alloys with Dissimilar Microstructures. Materials Reports, 2024, 38(8): 22080152-5.
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2024, Vol. 38 
