Laser Beam Welding of a Ti-15Mo/TiB Metal–Matrix Composite
Maxim Ozerov,
Elizaveta Povolyaeva,
Nikita Stepanov,
Volker Ventzke,
René Dinse,
Nikolai Kashaev,
Sergey Zherebtsov
Affiliations
Maxim Ozerov
Laboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, Russia
Elizaveta Povolyaeva
Laboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, Russia
Nikita Stepanov
Laboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, Russia
Volker Ventzke
Department of Laser Processing and Structural Assessment, Institute of Materials Mechanics, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany
René Dinse
Department of Laser Processing and Structural Assessment, Institute of Materials Mechanics, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany
Nikolai Kashaev
Department of Laser Processing and Structural Assessment, Institute of Materials Mechanics, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502 Geesthacht, Germany
Sergey Zherebtsov
Laboratory of Bulk Nanostructured Materials, Belgorod State University, 308015 Belgorod, Russia
A Ti-15Mo/TiB metal–matrix composite was produced by spark plasma sintering at 1400 °C. The fractions of the elements in the initial powder mixture were 80.75 wt.% Ti, 14.25 wt.% Mo, and 5 wt.% TiB2. The initial structure of the synthesized composite was composed of bcc β titanium matrix and needle-like TiB reinforcements with an average thickness of 500 ± 300 nm. Microstructure and mechanical properties of the composite were studied after laser beam welding (LBW) was carried out at room temperature or various pre-heating temperatures: 200, 400, or 600 °C. The quality of laser beam welded joints was not found to be dependent noticeably on the pre-heating temperature; all welds consisted of pores the size of which reached 200–300 µm. In contrast to acicular individual particles in the base material, TiB whiskers in the weld zone were found to have a form of bunches. The maximum microhardness in the weld zone (~700 HV) was obtained after welding at room temperature or at 200 °C; this value was ~200 HV higher than that in the base material.
