STRUCTURAL TRANSFORMATIONS IN AN ADDITIVELY MANUFACTURED VT-6-B4C COMPOSITE DURING THERMAL POST-TREATMENT
I.S. Gertsel, A.A. Golyshev
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences (ITAM SB RAS), Novosibirsk, Russia
Keywords: direct laser deposition, microhardness, X-ray diffraction analysis, synchrotron radiation, wear resistance
Abstract
A VT-6-10% B4C cetmet composite is produced using direct laser deposition (laser additive manufacturing). The effect of thermal post-treatment on the microstructure and properties of this composite is investigated. After heat treatment, the (α+γ) matrix structure is found to transform into an (α+β) structure, β-Ti is stabilized, the concentration of secondary phases (TiB, TiC1-x, TiB2, V2B3) increases, and the α₂-Ti3Al intermetallic compound is formed. Thermal post-treatment leads to an increase in microhardness (up to HV0.3 = 651) and improved wear resistance (wear volume decreases by 7%, and the friction coefficient by 0.08). These results confirm the effectiveness of heat treatment for optimizing the structure and enhancing the wear resistance of additively manufactured titanium matrix composites.
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