Microstructure evolution of TC25G/Ti2AlNb structural gradient material fabricated by laser directed energy deposition

• Published in: Materials letters Vol. 364; p. 136341
• Main Authors: Deng, Hongwen, He, Hongyun, Huang, Qi, Xu, Zhe, Wang, Jiawei, Cheng, Xu, Ran, Xianzhe
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2024
• Subjects: Additive manufacturing; Intermetallic alloys and compounds; Laser processing; Microstructure; Laser processing; Additive manufacturing; Microstructure; Intermetallic alloys and compounds
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2024.136341

•The TC25G/Ti2AlNb gradient material was fabricated by LDED.•The microstructure evolution for the material was systematically investigated.•The microstructure and composition transition is smooth in the transition zone.•The microhardness has no sudden change in the transition zone. 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.