Abstract
Laser directed energy deposition (LDED) is one of the most effective ways to manufacture structural gradient materials. The microstructure changes in transition zone (TZ) and heat-affected zone (HAZ) are often considered to be very important which could affect the mechanical property of the component. In this study, a titanium based gradient material, which is potentially used in high pressure compressor was fabricated by deposition of Ti2AlNb alloy on a forged TC25G alloy substrate. The thickness of the transition zone is around 2000 μm, and the phase transformation from TC25G alloy to Ti2AlNb alloy is followed as: α + β (TC25G alloy) → α + β (Heat affected zone) → α + α2 + B2/β + O (Transition zone) → α2 + B2/β + O (Ti2AlNb alloy). There is no any sudden change of microhardness in the gradient material with the lowest microhardness is found in Ti2AlNb alloy.
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