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

Abstract

The microstructure evolution, mechanical properties, and tribological properties of deposited metal Fe-C-Cr-Ti-B alloy by self-shielded flux-cored wire electrode (FCAW-S) with the introduction of exothermic addition and without it are investigated. Experimental studies showed that the introduction of CuO -Al exothermic addition in the composition of the wire core filler reduced the grain size of the deposited metal. Furthermore, X-ray diffraction analyses show that the boride layer contained FeB, Fe2B, and Ti(C, N) phases. Depth-sensing indentation was used to determine hard phase properties (hardness, Young's modulus and plasticity coefficient). It was shown that introduction of CuO -Al exothermic addition in the core filer increased the mechanical properties of deposited metal. The latter can be explained by the grain size decrease, as well as a change in the phase composition of the deposited metal due to additional copper alloying. This transformation is accompanied by an increase in hardness and in the Young's modulus. Tribological tests showed the effectiveness of introduction of the exothermic addition CuO -Al into the filler core for increasing the wear resistance under conditions of 3-body abrasive particle wear.

Determination of abrasion resistance of Fe28Cr5C1Mn coating applied to 30MnB5 boron alloy cultivator blades via electric arc spray

“…10 Scientists have from time to time also used various surface quality improvement techniques such as thermal spray coating, surface hardening, electrodeposition, melting of flux-cored wires and others. [11][12][13][14][15][16][17][18][19][20][21][22][23] Today, coatings are used in many different forms and for a wide variety of applications. They provide physical and chemical protection for the material used as the substrate.…”

Untitled

“…In this case, the introduction of an exothermic addition of CuO-Al system to the core filler of flux-cored wire electrode is more advantageous. According to our previous studies results [90,97], the introduction of CuO-Al exothermic addition to the core filler provides the weld metal alloying with copper. In addition, the exothermic additions CuO-Al, caused grain fragmentation and an increase in the volume of ferrite in matrix of the deposited metal, increasing such mechanical properties as the elasticity modulus and microhardness [97].…”

“…According to our previous studies results [90,97], the introduction of CuO-Al exothermic addition to the core filler provides the weld metal alloying with copper. In addition, the exothermic additions CuO-Al, caused grain fragmentation and an increase in the volume of ferrite in matrix of the deposited metal, increasing such mechanical properties as the elasticity modulus and microhardness [97]. Therefore, the wear resistance and corrosion resistance increasing at the stage of new parts manufacturing and during the worn parts restoration is an actual problem.…”

Microstructure and Wear Characterization of the Fe-Mo-B-C—Based Hardfacing Alloys Deposited by Flux-Cored Arc Welding

“…The favorable combination of properties between the reinforced surface layer and the base metal can be achieved by using various surface engineering processes. Extension of the service life of critical parts is provided by the methods of hardening using surface deformation [ 40 , 41 ], electrochemical Cr plating [ 42 , 43 ], chemical-thermal treatment [ 44 , 45 ], electrospark doping [ 46 , 47 ], laser doping [ 48 , 49 , 50 ], laser cladding [ 51 ], plasma hardening [ 52 , 53 ], thermal spraying [ 54 , 55 ], supersonic spraying [ 56 , 57 , 58 ], vacuum-arc deposition [ 59 , 60 , 61 ], formation of oxide and nitride coatings by combined methods [ 62 , 63 , 64 , 65 , 66 , 67 ], manual arc hardfacing [ 68 , 69 ], and flux-cored arc welding [ 70 , 71 , 72 , 73 , 74 , 75 , 76 ].…”