Microstructure and Fracture Toughness of Laser Remelting Treatment on FeNiCrAl Coating by High-Velocity Arc Spraying

被引：0
|
作者：
Sheng Z.-Q. [1 ]
Zhou J. [1 ,2 ]
Hu L. [1 ]
Wei S.-C. [2 ]
机构：
[1] School of Mechanical Engineering & Automation, Northeastern University, Shenyang
[2] National Key Laboratory for Remanufacturing, Academy of Army Armored Forces, Beijing
来源：
Dongbei Daxue Xuebao/Journal of Northeastern University | 2018年 / 39卷 / 04期
关键词：
FeNiCrAl coating; Fracture toughness; High-velocity arc spraying; Laser remelting; Microstructure;
D O I：
10.12068/j.issn.1005-3026.2018.04.011
中图分类号：
学科分类号：
摘要：
Remelting treatment of FeNiCrAl coating deposited by high-velocity arc spraying was conducted using laser technology. The microstructure, phase composition, microhardness and fracture toughness of the coating before and after remelting were analyzed. The results showed that the layer stack structure and pores of the spraying coating were eliminated, the microstructure of the coating became uniform and dense, and the interaction between the coating and the substrate were changed from mechanical combination to metallurgical bonding after remelting. Compared with the phases of the spraying coating, which consisted of α-Fe and intermetallic compounds, such as AlFe3, AlFe and Al0.4Fe0.6, three more phases could be observed after remelting, which were a new phase of Fe-Cr, the solid solution of [Fe, Ni] and carbide NiCx. The average microhardness of the coating after remelting was 7.79 GPa, which was about 3 times than that of the substrate (2.5 GPa) and about 1.3 times than that of the spraying coating (6.0 GPa). In the indentation test of the spraying coating, the indentation cracks appeared at the loads of 4.9 and 9.8 N, corresponding to the average fracture toughness of spraying coating of 1.20 MPa•m1/2, while no crack was found during loading of 2.94~9.8 N after remelting. © 2018, Editorial Department of Journal of Northeastern University. All right reserved.
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页码：506 / 510and521
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