Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 875, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2023.145087
Keywords
TC17 titanium alloy; Electron beam welding; In situ SEM; Ghost structure; Mechanical properties
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The internal tensile deformation of the individual base metal zone (BM), heat-affected zone (HAZ), and fusion zone (FZ) in a titanium alloy (Ti-5Al-2Sn-2r-4Mo-4Cr, wt.%) electron beam welding (EBW) joint is investigated. The formation of a ghost structure with a hierarchical cluster structure within the initial & alpha;P grains is observed in HAZ. The needle-shaped thermal martensite formed during EBW causes the premature failure of FZ.
The internal tensile deformation of the individual base metal zone (BM), heat-affected zone (HAZ), and fusion zone (FZ) in a titanium alloy (Ti-5Al-2Sn-2r-4Mo-4Cr, wt.%) electron beam welding (EBW) joint is investigated. The ultimate strength of BM with a bimodal microstructure is 1047.5 MPa, and the elongation to fracture is 9.8%. HAZ is distinguished by the formation of a ghost structure with a hierarchical cluster structure within the initial & alpha;P grains, while the embedded & alpha;s laths dissolve in the matrix and relatively coarsening & beta; grains are generated. During tension, the ghost structures strongly inhibit and deflect slip initiation and extension in the relatively coarsening & beta; matrix. The competitive balance between strengthening from the ghost structure and weakening from the coarsening matrix dominates the mechanical properties of the HAZ, which then induces a hybrid fracture. The needle-shaped thermal martensite that formed during EBW causes the FZ to fail prematurely. The microstructural evolution of HAZ and FZ decreases their mechanical properties. This research may shed some light on the mechanical enhancement of titanium alloys by utilizing the multiple & alpha;L laths precipitated within the initial & alpha;P structure associated with the bimodal matrix.
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