Enhancing oxidation resistance of LPBF-fabricated NiCrAl alloys via TiC particle additions
Year: 2026
Type: article
Abstract: This study systematically investigates the influence of TiC particles on the microstructure and high-temperature oxidation behavior of NiCrAl alloys fabricated by laser powder bed fusion (LPBF). Comparative analyses reveal that the incorporation of both 1 and 2 wt % TiC transforms the microstructure of LPBF NiCrAl alloys from a columnar subgrain structure to a refined cellular subgrain structure, accompanied by a crystallographic orientation shift from <111>/<101> to a dominant <001> texture. High-temperature oxidation tests conducted at 900°C for 24 h in 1 atm oxygen environment demonstrate significantly enhanced oxidation resistance in the NiCrAl/1 wt %TiC composite compared to the monolithic alloy. This improvement is attributed to the formation of a dual-phase oxide scale consisting of Cr2O3 and TiO2, which replacing the porous Cr2O3 layer observed on the NiCrAl alloy. The incorporation of TiO2 promotes defect healing within the oxide film, thereby inhibiting cationic outward diffusion and oxygen inward penetration.
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,640
OpenAlex ID: W7160425319