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Open AccessArticle

Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy

1
Key Laboratory for Anisotropy and Texture of Materials Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110006, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(2), 71; https://doi.org/10.3390/coatings9020071
Received: 15 November 2018 / Revised: 3 January 2019 / Accepted: 21 January 2019 / Published: 24 January 2019
(This article belongs to the Special Issue Tribology and Surface Engineering)
The K417G Ni-based superalloy is widely used in aeroengine turbine blades for its excellent properties. However, the turbine blade root with fir tree geometry experiences early failure frequently, because of the wear problems occurring in the working process. Laser forming repairing (LFR) is a promising technique to repair these damaged blades. Unfortunately, the laser formed Ni-based superalloys with high content of (Al + Ti) have a high cracking sensitivity. In this paper, the crack characterization of the laser forming repaired (LFRed) K417G—the microstructure, microhardness, and tribological properties of the coating before and after laser remelting—is presented. The results show that the microstructure of as-deposited K417G consists of γ phase, γ′ precipitated phase, γ + γ′ eutectic, and carbide. Cracking mechanisms including solidification cracking, liquation cracking, and ductility dip cracking are proposed based on the composition of K417G and processing characteristics to explain the cracking behavior of the K417G superalloy during LFR. After laser remelting, the microstructure of the coating was refined, and the microhardness and tribological properties was improved. Laser remelting can decrease the size of the cracks in the LFRed K417G, but not the number of cracks. Therefore, laser remelting can be applied as an effective method for strengthening coatings and as an auxiliary method for controlling cracking. View Full-Text
Keywords: K417G Ni-based superalloy; laser forming repairing; laser remelting; microstructure; cracking behavior; tribology K417G Ni-based superalloy; laser forming repairing; laser remelting; microstructure; cracking behavior; tribology
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MDPI and ACS Style

Liu, S.; Yu, H.; Wang, Y.; Zhang, X.; Li, J.; Chen, S.; Liu, C. Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy. Coatings 2019, 9, 71. https://doi.org/10.3390/coatings9020071

AMA Style

Liu S, Yu H, Wang Y, Zhang X, Li J, Chen S, Liu C. Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy. Coatings. 2019; 9(2):71. https://doi.org/10.3390/coatings9020071

Chicago/Turabian Style

Liu, Shuai; Yu, Haixin; Wang, Yang; Zhang, Xue; Li, Jinguo; Chen, Suiyuan; Liu, Changsheng. 2019. "Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy" Coatings 9, no. 2: 71. https://doi.org/10.3390/coatings9020071

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