Microstructure Evolution and Tensile Properties of Ti3Al/Ni-based Superalloy Welded Joint

doi:10.1016/j.jmst.2014.06.004

Abstract

Abstract: In the present work, the dissimilar joining of a Ti₃Al-based alloy to a Ni-based superalloy was attempted by gas tungsten arc (GTA) welding technology. Sound joints were successfully achieved by using a Cu–Ni alloy as filler material. According to X-ray energy dispersive spectroscopy and X-ray diffraction analysis results three transitional layers at the weld/Ti₃Al interface were verified as follows: Ti₂AlNb phase dissolved with Cu and Ni; Al(Cu,Ni)₂Ti, (Cu,Ni)₂Ti and (Nb,Ti) solid solution; Cu-rich phase and a complex multi-element phase. The In718/weld interface is characterized by solid solutions of Ni, Cu, Cr, Fe and Nb. The average tensile strength of the as-welded joints at room temperature is 163 MPa, and after a post–weld heat treatment it is increased slightly to 177 MPa. The fracture occurred at the surfacial layer of the joined Ti₃Al base alloy, indicating that the Ti₂AlNb layer dissolved with Cu and Ni is the weak link of the Ti₃Al/In718 joint.

Key words: TiAl-based alloy, Ni-base superalloys, Welding, Interface, Microstructure, Tensile properties

Chen Bingqing, Xiong Huaping, Sun Bingbing, Tang Siyi, Guo Shaoqing, Zhang Xuejun. Microstructure Evolution and Tensile Properties of Ti₃Al/Ni-based Superalloy Welded Joint[J]. J. Mater. Sci. Technol., 2014, 30(7): 715-721.

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Microstructure Evolution and Tensile Properties of Ti₃Al/Ni-based Superalloy Welded Joint

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