IMR OpenIR
Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy
Liu, Shuai; Yu, Haixin; Wang, Yang; Zhang, Xue; Li, Jinguo; Chen, Suiyuan; Liu, Changsheng
2019-02-01
Source PublicationCOATINGS
ISSN2079-6412
Volume9Issue:2
AbstractThe 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) K417Gthe microstructure, microhardness, and tribological properties of the coating before and after laser remeltingis presented. The results show that the microstructure of as-deposited K417G consists of phase, precipitated phase, + 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.
KeywordK417G Ni-based superalloy laser forming repairing laser remelting microstructure cracking behavior tribology
Indexed BySCI
Language英语
WOS IDWOS:000460700700009
PublisherMDPI
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81390
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Liu, Shuai,Yu, Haixin,Wang, Yang,et al. Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy[J]. COATINGS,2019,9(2).
APA Liu, Shuai.,Yu, Haixin.,Wang, Yang.,Zhang, Xue.,Li, Jinguo.,...&Liu, Changsheng.(2019).Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy.COATINGS,9(2).
MLA Liu, Shuai,et al."Cracking, Microstructure and Tribological Properties of Laser Formed and Remelted K417G Ni-Based Superalloy".COATINGS 9.2(2019).
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