Mr. Beibei Jia Profile

Beibei Jia

at CNITECH

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Proceedings Article | 12 November 2018 Paper

Investigation on Inconel 718 repairing by using laser additive and subtractive hybrid manufacturing technology

Zifa Xu, Junke Jiao, Wentai Ouyang, Shaohui Jia, Beibei Jia, Wenwu Zhang

Proceedings Volume 10813, 1081304 (2018) https://doi.org/10.1117/12.2500367

KEYWORDS: Fiber lasers, Polishing, Laser applications, Pulsed laser operation, Laser processing, Additive manufacturing, Etching, Crystals, Manufacturing, Surface finishing

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Due to the high manufacturing cost of Nickel based alloy compressor blisks, aero engine repairing process research has important engineering significance and economic value. Inconel718 Ni-based superalloy has the advantages of irradiation, corrosion resistance and excellent mechanical and processing properties. In this paper, a production process for the laser additive and subtractive hybrid manufacturing technologies was presented to repair a microcrack of Inconel 718. The whole repairing process includes four steps. Firstly, a pulsed laser was used to clean and etch the crack through materials subtractive. Secondly, a high-power continuous wave laser was used to additive material in the crack by laser deposition. Thirdly, a pulsed laser was applied to remove the excess repair material. Finally, a fiber laser was used to polish surface. The results showed that defect-free repair samples can be obtained with proper processing parameters. Metallurgical bonding could be achieved between the melting Inconel718 powder and the substrate under the action of a high-energy laser beam. The columnar dendrite and inter-dendritic structure in the repair zone are epitaxially grown along the deposition direction. The microstructure in the repair zone was fine and uniform due to the high gradient, high-speed solidification characteristics of the laser rapid fusion. The micro-hardness of the repaired tissue reduced to about 87% of the matrix and there was no new phase produced in the repair zone.

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