Improvement of Abrasion Resistance of Production Equipment Wear Parts by Hardfacing with Flux-Cored Wires Containing Boron Carbide/Metal Powder Reaction Mixtures

Abstract

In this work was established that serial traditional hardfacing materials based on the Fe-Cr-C system are not effective for improvement of abrasion resistance of elements of equipment for production of bricks, solid fuel briquettes and for restoration of augers, due to the fact that this equipment works at significant specific and cyclic loads. Features of the coarse-grained structure of Fe-Cr-C based coatings leads to intensive abrasive wear. The aim of this study was to increase a durability of that equipment by using of flux cored electrodes with reaction components of Ti, Cr, Mo, B4C and their combinations to provide synthesis, which leads to fine-grained structure of refractory borides and carbides and their solid solutions with increased hardness. Structure of the hardfacing coatings were investigated by method of metallography, scanning electron microscopy (SEM), electron backscatter diffraction (BSD) mode and energy dispersive X-ray spectroscopy (EDS). Temperature dependences of equilibrium phase amount of the hardfacing materials were calculated by the CALPHAD technique, using JMatPro software. It was investigated that the offered materials are characterized by higher wear resistance at high specific and cyclic loads in comparison with serial production high-chromium hardfacing materials (Lastek, ESAB, Paton IEW). It was established that the abrasion wear resistance at high specific and cyclic loads depends mostly of formation of the structure of hardfacing material, and not the hardness. Also, using of powders of pure metals and their combination as reaction mixture for FCAW leads to fine structure which contains of refractory borides and carbides and their solid solutions.

Effect of Exothermic Addition (CuO - Al) on the Structure, Mechanical Properties and Abrasive Wear Resistance of the Deposited Metal During Self-Shielded Flux-Cored Arc Welding

“…In order to increase the service life of mining equipment and tools, design technological and operational methods are used. When designing the parts to be strengthened, pay special attention to the rational choice of materials and coatings [4][5][6][7], study of temperature distribution [8,9] and stresses in layered bodies, including bodies with defects [10-12] theoretical and experimental studies of wear processes [13,14] and tests taking into account the action of corrosive environment [15][16][17]. Technological methods provide the necessary accuracy of manufacturing parts, manufacturing errors of which lead to an increase in stress levels and cause uneven operation of the cutting elements of drill bits [18,19] and rational modes of surfacing [20,21].…”

“…Fe-B-С system flux-cored wire electrode hardfacing technology is used in different industry branches for equipment worn parts reinforcement [32][33][34][35][36]. However, are becoming more widespread by Fe-Cr-B-C and Fe-Ti-Cr-B-C system alloys, which have the best mechanical properties and wear resistance [8, [37][38][39][40][41]. Moreover, these borides are based on the triple alloying system Fe-C-B, allowing to reduce quantity of more expensive, but more wide-spread alloying elements, comprising strengthening phase, such as Cr, Mo, V.…”

Influence of Heavy Weight Drill Pipe Material and Drill Bit Manufacturing Errors on Stress State of Steel Blades

“…Studies of metal structure [55][56][57] and diffusion processes [58][59][60] are necessary for the development of modern materials and hardening technologies. Coatings [60][61][62][63] occupy an important place among the methods of hardening and surfacing [64] and are used to provide high wear resistance of the operational surfaces of parts.…”

Using FCAW with Electrodes Based on Fe-Ti-Mo-B-C System for Increasing of Durability of Junk Removal Tools

“…For solving such problems, and achieving increased hardness and crack resistance of materials scientists are also experimenting with alloying above mentioned systems with boron, Nb, V and Mo. Mostly metals for researching are used in form of ferroalloys, but there are works that aimed on using pure metal powders to achieving structures with increased mechanical parameters, that are characterized with higher wear resistance (Ivanov et al, 2020). Restoring and increasing of durability of tools and equipment parts is one of the most important ways to improving the efficiency of production industries.…”