γ⁃TiAl与Ti2AlNb线性摩擦焊接头微观组织

doi:10.7527/S1000-6893.2023.29347

Abstract

Abstract:

To promote the linear friction welding technology in manufacturing the dissimilar materials blisk of the γ-TiAl blades and Ti₂AlNb disc， linear friction welding of γ-TiAl and Ti₂AlNb is studied. The microstructure and mechanical properties of the welded joints that are as welded and post weld heat treated were analyzed by SEM， EBSD and tensile testing. The results indicate that the phase composition of the welding zone from the TiAl side to the Ti₂AlNb side is γ-α₂-B2 as welded and changed into γ-α₂+B2-O+B2 after 800 ℃/2 h AC post weld heat treatment. The Thermal and Mechanical Affected Zone （TMAZ） on the γ-TiAl side undergoes laminar bending deformation， while the TMAZ on the Ti₂AlNb side undergoes grain refinement and recrystallization. The tensile strength of the joints after post weld heat treatment reaches 277 MPa and 478 MPa at room temperature and 650 ℃， respectively.

Key words: friction welding, TiAl, Ti₂AlNb, microstructure, blisk

CLC Number:

V263

Suigeng DU, Hongyi HU, Ke DING. Microstructure of γ⁃TiAl and Ti₂AlNb linear friction welding joint[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(13): 629347-629347.

Figures/Tables 12

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References 30

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合金	Ti	Al	Nb	Cr	V
Ti₂AlNb	Bal	21.5	26.0
γ-TiAl	Bal	47.5		1.0	2.5

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Microstructure of γ⁃TiAl and Ti₂AlNb linear friction welding joint

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Microstructure of γ⁃TiAl and Ti₂AlNb linear friction welding joint