Deposition of Multicomponent Alloys on Low-Carbon Steel Using Gas Tungsten Arc Welding (GTAW) Cladding Process

Abstract

In this study, multicomponent alloy fillers were deposited on low-carbon steel substrates using gas tungsten arc welding (GTAW) process. The microstructure and wear properties of Al-Co-Cr-Ni-Mo-Fe-Si multicomponent alloys were studied. The GTAW cladding layers were analyzed by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), X-ray energy dispersive spectroscopy (EDS), and transmission electron microscope (TEM). The results show that the microstructure mainly consisted of dendritic FeMoSi and interdendritic BCC phases and that the addition of Si coarsened the primary FeMoSi phase. In addition, different precipitate morphologies were found in the interdendrites. As the Si content increased from 5.92 to 14.53 at%, the microhardness also increased from 826 to 885 Hv and the wear resistance improved significantly. The FeMoSi dendrites possessed covalent-dominant strong atomic bonds that enhanced the hardness and wear resistance of claddings.

Microstructure and properties of FeCoCrNiMoSix high-entropy alloys fabricated by spark plasma sintering

“…According to EDS analysis, the white phase was mainly composed of Mo-rich FCC phase while the dark phase consisting of Fe-rich FCC phase, which has a similar result with Chen et al [31]. Figure 3 presents the area percentage of Fe-rich and Mo-rich phases in Fig.…”

“…The addition of Si can also improve the oxidation resistance in the NbCrMoTiVAl0.5Si0.3 and equal atomic NbMoCrTiAl systems [30]. Moreover, it has been proved that the addition of Si resulted in the formation of the MoSi-rich phase in AlCoCrNiMoFeSi claddings, which offered an improvement of tribological behaviors [31]. Therefore, it has been demonstrated that Si could be a potential strengthening element to improve the properties and performance of a number of HEAs.…”

High-Entropy Alloys: A Critical Review

“…HEA coatings/claddings can also be prepared by sputtering or other cladding techniques. [22,23,73,[133][134][135][136][137][138][139][140] In terms of the phase and crystal structure of HEAs, most of our knowledge is based on the as-cast state (after vacuum arc melting). Very little is known about the equilibrium phases and phase diagrams, but these are key to the design and development of HEAs.…”

The Microstructure and Wear Properties of Laser-Clad WC-Cr<SUB>3</SUB>C<SUB>2</SUB> Cermet Coating on Steel Substrate

“…As a result, the melted alloy elements could diffuse each other between the coating and the substrate, which contributed to produce the good metallurgical bonding between the coating and the substrate and the addition of Ni caused the formation of large amount of the -(Fe, Ni) in the coating. In addition, because the density of Al 2 O 3 particles (3.97 g/cm 3 ) was lower than that of (Fe, Ni) alloy and the violent stirring and convection were driven by thermocapillarity, Al 2 O 3 particles as slag easily ascend toward the surface through the molten deposit and remove from the clad coating. This was the main reason tha the coating detected were free of Al 2 O 3 .…”

“…Thus, these carbides are widely used for producing ceramic-metal composite coatings on the substrate by conventional hardfacing techniques, such as thermal spraying, plasma spraying, electroslag remelting and arc welding, to improve wear resistance. [1][2][3][4][5] However, the surface coating produced by these technique had some disadvantages, such as the composite coatings with porosities, excessive energy input, the mechanical bonding between the composite coating and the substrate. In recent years, laser cladding technique has been developed and can avoid these disadvantages of the conventional surface techniques mentioned above by choosing optimal parameters.…”