Abstract：In this paper, Q235 steel is used as the matrix material, and the FeCrNiAlBSi coating is prepared on the surface of the matrix by suitable high speed arc spraying process parameters. After that, FeCrNiAlBSi coating was remelted under certain parameters. The metallographic structure, microstructure and properties of FeCrNiAlBSi coating and laser remelted layer were compared, and high temperature oxidation resistance was compared. The main conclusions of the research are as follows: FeCrNiAlBSi coating is prepared under the condition of spraying voltage 32-34V and current 200-220A. The cross-section structure is layered structure, mainly composed of Fe-Cr metal crystalline phase, metal oxide and a small number of pores. The mean microhardness and bonding strength are 558.4HV0.1 and 17.2MPa respectively. Laser remelting is carried out under the parameters of power 280W, defocus volume -0.5mm, scanning speed 180mm/min and lap ratio 70%. After remelting, the coating is mainly composed of Ni-Cr-Fe and Fe-Cr. The pores are eliminated, the layered structure disappears, and the coating is changed from mechanical binding to metallurgical bonding between the coating and the matrix. The oxidation weight increase of the FeCrNiAlBSi coating is about 1/3 of the matrix and the oxide weight of the laser remelting layer is only 1/6 of the matrix after remelting at 600 C for 48h.
2018, Vol. 25 
