Abstract
At present, most Mo2FeB2-based cermets are prepared by vacuum sintering. However, vacuum sintering is only suitable for ordinary cylinder and cuboid workpieces, and it is difficult to apply to large curved surface and large size workpieces. Therefore, in order to improve the flexibility of preparing Mo2FeB2 cermet, a flux cored wire with 70% filling rate, 304 stainless steel, 60 wt% Mo powder and 40 wt% FeB powder was prepared. Mo2FeB2 cermet was prepared by an arc cladding welding metallurgy method with flux cored wire. In this paper, the microstructure, phase evolution, hardness, wear resistance and corrosion resistance of Mo2FeB2 cermets prepared by the vacuum sintering (VM-Mo2FeB2) and arc cladding welding metallurgy method (WM-Mo2FeB2) were systematically studied. The results show that VM-Mo2FeB2 is composed of Mo2FeB2 and γ-CrFeNi.WM-Mo2FeB2 is composed of Mo2FeB2, NiCrFe, MoCrFe and Cr2B3. The volume fraction of hard phase in WM-Mo2FeB2 is lower than that of VM-Mo2FeB2, and its hardness and corrosion resistance are also slightly lower than that of VM-Mo2FeB2, but there are obvious pores in the microstructure of VM-Mo2FeB2, which affects its properties. The results show that WM-Mo2FeB2 has good diffusion and metallurgical bonding with the matrix and has no obvious pores. The microstructure is compact and the wear resistance is better than that of VM-Mo2FeB2.
Highlights
With its high hardness, high melting point, good wear resistance and corrosion resistance, metal borides are often widely used in mechanical processing, ore grinding, alloy smelting, parts manufacturing and other fields [1,2,3,4]
The microstructure was studied with scanning electron microscope (SEM, JSM-6600V, Japanese electronics company, Tokyo, Japan.) in backscattered electron (BSE) mode while analysis of the chemical composition of both hard phase and binder phase was performed by an electron probe micro analyzer (EPMA, JXA-8530F PLUS, Japanese electronics company, Tokyo, Japan)
The results show that the WM-Mo2 FeB2 is composed of Mo2 FeB2 (M3 B2 ), NiCrFe, MoCrFe and
Summary
High melting point, good wear resistance and corrosion resistance, metal borides are often widely used in mechanical processing, ore grinding, alloy smelting, parts manufacturing and other fields [1,2,3,4]. In the past few years, remarkable achievements have been made in the study of the structures and properties of different types of metal borides, such as the top-down nanostructures of Strontium Hexaboride [5], the phase stability in ternary (Bax Ca1−x )B6 and (Bax Sr1−x )B6 compounds [6], and the anisotropic thermal expansion properties of MoAlB, Cr2 AlB2 , Mn2 AlB2 and Fe2 AlB2 of selective layered ternary transition metal borides [7] These ternary boride-based technical ceramics have great potential to replace cemented carbide materials. In order to improve its flexibility, flux cored wire can be prepared and Mo2 FeB2 cermet can be prepared on the surface of workpiece by argon arc welding metallurgy. This method can be applied to any curved surface of any shape and can produce a large area of workpiece surface, which greatly improves its application range
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