Comparison of Structure and Properties of Mo2FeB2-Based Cermets Prepared by Welding Metallurgy and Vacuum Sintering

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.

Synthesis, Characterization, and First-Principles Analysis of the MAB-Like Ternary Transition-Metal Boride Fe(MoB)2

“…Fe­(MoB) 2 maintained tetragonal symmetry with a P 4/ mbm space group. The lattice parameters of Fe­(MoB) 2 are a = b = 5.809(5) Å and c = 3.143(8) Å, and the unit cell volume is V = 106.06 Å 3 , which is close to that of previous experimental works. , Compared with the ground-state structure in previous reports, the average deviation of the lattice parameters in our results is approximately 1.1% . The crystal structure information is compiled in Table S1, and the polyhedral crystal models of Fe­(MoB) 2 are presented in Figure b,c.…”

The thermodynamic and mechanical properties of Earth-abundant metal ternary boride Mo2(Fe,Mn)B2 solid solutions for impact- and wear-resistant alloys

“…1 Mo 2 FeB 2 is used as a component of metal matrix composites and coatings with the composite structure using Fe-based alloys alloyed with other metals such as Mn, Cr, and Ni as the metal matrix. [2][3][4] For example, the effect of Mn in such materials and coatings is critical to achieving complex impact abrasion wear resistance due to the formation of a TWinning Induced Plasticity (TWIP) steel 5 matrix. Hence, the intentional development of hardfacing alloys with such a combination of characteristics can be achieved by predicting the effect of Mn on the composition and properties of key (both ceramic and metal) phases using atomistic and thermodynamic models of the corresponding solid solutions.…”

“…However, it is important to note that the applicability of the VCA is limited to systems that exhibit insignificant deviations from Vegard's law. 22 A comprehensive analysis of the experimental investigations 3,4,6,7 and theoretical studies [9][10][11][12]15,16 of Mn 2 FeB 2 and similar compounds shows that current investigations mainly focus on these compounds in their pure state. However, there is a lack of data regarding the properties of their based solid solutions.…”

Creation of wear-resistant layers on steels using TIG electric arc surface remelting process with applying CaCN2-based nitriding powder

“…A signi cant increase in the wear resistance of steels can also be achieved by remelting car-bide powders (WC, SiC, TiC) by TIG [30][31][32]. Xu et al [33] used a TIG process to remelt a ux cored wire lled with a powder of suitable chemical composition to form a cermet layer on low carbon steel substrate while achieving similar properties compared to the same type of cermet produced by sintering. Thanks to remelting, the microstructure of the cermet formed by the TIG process was even more compact and achieved higher wear resistance.…”