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

doi:10.1117/12.2500367

12 November 2018 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

Author Affiliations +

Proceedings Volume 10813, Advanced Laser Processing and Manufacturing II; 1081304 (2018) https://doi.org/10.1117/12.2500367
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

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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Zifa Xu, Junke Jiao, Wentai Ouyang, Shaohui Jia, Beibei Jia, and Wenwu Zhang "Investigation on Inconel 718 repairing by using laser additive and subtractive hybrid manufacturing technology", Proc. SPIE 10813, Advanced Laser Processing and Manufacturing II, 1081304 (12 November 2018); https://doi.org/10.1117/12.2500367

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KEYWORDS

Fiber lasers

Polishing

Laser applications

Pulsed laser operation

Laser processing

Additive manufacturing

Etching

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