Abstract
Dissimilar welding of TiAl-based alloy and Ni-based superalloy with different single alloying element (Ti, Nb, V, Cu) was performed by laser. Detailed effects of alloying element on microstructural characterization and mechanical properties of the joints were investigated. The results showed that laser welding of TiAl/Ni-based superalloy was not achieved by using Ti filler metal. The large number of Ni0.35Al0.30Ti0.35 brittle phases in the joint was the main factor of affecting the weldability of joint. Laser welding was not achieved a better connection by using Nb filler metal, and macrocracks existed in the weld, which mainly attributed to the formation of AlNbNi, AlNbNi2 and Cr2Nb intermetallics. The dissimilar metals was successfully welded by using V filler metal, and (V,Cr) solid solution and (V,Cr)/AlNi2Ti eutectic phase were formed in the weld zone. The average tensile strength of the joint was 140 MPa and the joint fracture occurred on Ni-based superalloy side, owing to the fine (V,Cr)/AlNi2Ti eutectic phase. The dissimilar metals was successfully welded by using Cu filler metal, and Cu solid solution and Al(Ni,Cu)2Ti/Cr eutectic phase were formed in the weld zone. The average tensile strength of the joint was 155 MPa and the joint fracture occurred on TiAl alloy side where more AlCuTi and AlCu2Ti formation has.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
