Study on the Self-Organization of an Fe-Mn-C-B Coating during Friction with Surface-Active Lubricant

Abstract

<jats:p>This paper investigates the friction process between an Fe-based coating and C45 steel with surface-active lubrication, as well as examines the coating surface before and after tribological testing. As a result, it is possible to determine whether the surface undergoes self-organization during friction. Coatings were produced by hardfacing a subeutectic alloy Fe-Mn-C-B modified by silicon, nickel, chromium and copper. Tribological tests were performed using a pin-on-disc tribometer. The pin (coating) and the disc made of steel C45 were subjected to heat treatment (hardening and tempering). The tests were carried out under loads of 3 MPa, 7 MPa and 10 MPa at a constant sliding velocity of 0.4 m/s and a sliding distance of 5700 m using a surface-active lubricant (glycerine oil). Obtained results were compared with the published results of previous tests carried out under the same conditions but under a load of 20 MPa. Obtained microscopic and spectroscopic results demonstrate that that the friction pair materials (the coating made of subeutectic alloy Fe-Mn-C-B modified by Si, Ni, Cr, Cu and C45 steel) and the surface-active lubricant cause self-organization during friction. The friction surface of the coatings has a flay-laminar structure and is covered with triboreaction products. The surface shows the presence of wear-resistant compounds such as oxides, carbides, borides and nitrides.</jats:p>

Effect of Laser Heating on the Life of Cutting Tools Coated with Single- and Multilayer Coatings Containing a TiN Layer

“…After heating with 40% of the maximum laser power, their color changed to golden, whereas, after heating with 50% of the maximum laser power, the color became darker (golden brown). The color changes observed for the TiN coatings were confirmed by chemical microanalysis results [ 6 , 46 , 47 , 48 , 49 ]. Figure 19 shows images of the surface of the test samples before (a) and after laser heating with (b) 40% and (c) 50% of the maximum laser power.…”

Phase Equilibrium and Microstructure Examinations of Eutectic Fe-C-Mn-B Alloys

“…The studied eutectic alloys were dispersion-strengthened natural composites consisting of relatively soft matrix phase: alloyed austenite or pearlite, strengthened with a hard and wear-resistant (Fe, Mn) 23 (C, B) 6 phase. By changing the contents of the alloying elements, it is possible to obtain two or more phases in equilibrium [17,[38][39][40][41][42][43][44][45][46][47][48][49][50]. By balancing the four components, one can obtain an alloy with the required combination of carbide content and composition.…”

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

“…Such a method can also be used to apply hardfacing to new wear parts as well as to restore worn ones. In addition to experimental methods for the development of materials for wear-resistant coatings, the results of thermodynamic modeling [ 77 , 78 ], the calculation of crystal lattice properties [ 79 , 80 , 81 ], the determination of factors influencing corrosion resistance [ 82 ], and a rational choice of deposition process parameters [ 83 , 84 ] are very important for achieving the maximum result of surface reinforcement. When developing technological processes for depositing coatings [ 85 ] and modeling metal melting processes [ 86 ], it is also necessary to take into account the influence of external factors, as well as to apply intelligent methods for comparing energy processes [ 87 ].…”