Cracking of Ti2AlNb-based alloy after laser beam welding

Crack formation process in the Ti-23Al-23Nb-1.4V-0.8Zr-0.4Mo-0.4Si (at.%) alloy based on orthorhombic titanium aluminide (Ti2AlNb), especially in the weld zone (WZ), heat-affected zone (HAZ), and base metal (BM), during laser beam welding (LBW) at room temperature was considered. It was determined t...

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Veröffentlicht in:	IOP conference series. Materials Science and Engineering 2021-01, Vol.1014 (1)
Hauptverfasser:	Panov, D O, Naumov, S V, Sokolovsky, V S, Volokitina, E I, Kashaev, N, Ventzke, V, Dinse, R, Riekehr, S, Povolyaeva, E A, Alekseev, E B, Nochovnaya, N A, Zherebtsov, S V, Salishchev, G A
Format:	Artikel
Sprache:	eng
Schlagworte:	Base metal Beta phase Crystallites Heat affected zone Intermetallic compounds Laser beam welding Room temperature Titanium aluminides Titanium base alloys
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Zusammenfassung:	Crack formation process in the Ti-23Al-23Nb-1.4V-0.8Zr-0.4Mo-0.4Si (at.%) alloy based on orthorhombic titanium aluminide (Ti2AlNb), especially in the weld zone (WZ), heat-affected zone (HAZ), and base metal (BM), during laser beam welding (LBW) at room temperature was considered. It was determined that the crack spread in the WZ throughout the crystallites of β-phase. In the HAZ, cracks spread throughout the globular β-phase crystals body and along the edges of globular α2- and O-phases. The cracking stopped in BM due to a mechanism similar to shear ligament toughening. Cracking can be effectively suppressed by increasing the LBW temperature.
ISSN:	1757-8981 1757-899X
DOI:	10.1088/1757-899X/1014/1/012035