Cracking of Ti2AlNb-based alloy after laser beam welding

D O Panov; S V Naumov; V S Sokolovsky; E I Volokitina; N Kashaev; V Ventzke; R Dinse; S Riekehr; E A Povolyaeva; E B Alekseev; N A Nochovnaya; S V Zherebtsov; G A Salishchev

doi:10.1088/1757-899X/1014/1/012035

IOP Conference Series: Materials Science and Engineering

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Cracking of Ti₂AlNb-based alloy after laser beam welding

D O Panov¹, S V Naumov¹, V S Sokolovsky¹, E I Volokitina¹, N Kashaev², V Ventzke², R Dinse², S Riekehr², E A Povolyaeva¹, E B Alekseev³, N A Nochovnaya³, S V Zherebtsov¹ and G A Salishchev¹

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IOP Conference Series: Materials Science and Engineering, Volume 1014, Annual School of Young Scientists 2020: "Synthesis, structure and properties of high entropy materials" 14-16 October 2020, Belgorod, Russia Citation D O Panov et al 2021 IOP Conf. Ser.: Mater. Sci. Eng. 1014 012035 DOI 10.1088/1757-899X/1014/1/012035

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Author e-mails

panov_d@bsu.edu.ru

NaumovStanislav@yandex.ru

Author affiliations

¹ Laboratory of Bulk Nanostructured Materials, Belgorod State University, 85 Pobeda Str., 308015, Belgorod, Russian Federation

² Department of Laser Processing and Structural Assessment, Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany

³ Federal State Unitary Enterprise "All-Russian Scientific Research Institute of Aviation Materials", 17 Radio Str., 105005, Moscow, Russia

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Abstract

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.

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