Frictional Strength of Electric Spark Coatings from Powder Wires under Friction without Lubrication
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tional Strength of Electric Spark Coatings from Powder Wires under Friction without Lubrication V. M. Holubetsa, M. I. Pashechkob, *, K. Dzedzicb, J. Borcb, and A. V. Tisovc aNational
Forestry University of Ukraine, Lviv, 79057 Ukraine Polytechnic Institute, Lublin, 20-618 Poland c National Aviation University, Kyiv, 02000 Ukraine *e-mail: [email protected]
bLublin
Received March 25, 2020; revised July 5, 2020; accepted July 7, 2020
Abstract—The absolute values of the micromechanical characteristics of the electrospark coating (ESC) obtained by electrospark alloying (ESA) with an electrode made of a serial flux-cored wire (FCW) 80X20R3T have been investigated. Regularities of changes in the magnitude of the wear of ESC applied by electrodes made of flux-cored wire depending on operating parameters and surface roughness in the contact zone during friction without lubrication are established. Keywords: micromechanical characteristics, electrode, electrospark coating, sintered powder wire, wear, roughness, dry friction DOI: 10.3103/S1068366620050128
INTRODUCTION The technology of electrospark alloying (ESA) is widely used in various industries. The physics of the process and the engineering of the surface layer of ESA are established and data on the equipment, electrodes, technologies, and application experience are given [1]. To date tungsten-free electrodes made of ironbased eutectic alloys have been developed and are widely used [1] to improve the characteristics of mass transfer. A promising direction in the development of ESA is evidenced by complex alloying and laser processing for hardening high-speed steels [2]. By ESA on the surface of the material it is possible to create amorphous coatings of high hardness [3, 4] and multicomponent composite coatings [5]. Certain scientific and practical interest is caused by the application of electrospark coating (ESC) from flux-cored wires (FCWs) of Fe–Mn–B–C and Fe– Cr–B–C systems used as electrodes. The frictional behavior of the coatings of the Fe–Mn–B–C system under dry friction is established. [6] and coatings of the Fe–Cr–B–C system for boundary lubrication (I 20 oil) [7]. The morphology and element-wise analysis of surfaces formed in the process of friction is investigated. However, there is no evidence of tribological testing of ESC using Fe–Cr–B–C systems as a dry electrode under the conditions of dry friction, which hinders the introduction of ESA technology into production.
Aim of this study: to study the characteristics of micro- and submicrovolumes of the surface layer of 45 steel with ESC obtained from the FCW of the Fe– Cr–B–C system and establish the frictional behavior of the coating under conditions of dry friction. MATERIALS AND METHODS ESC was carried out at the Elitron installation for ESA (Institute of Applied Physics, Academy of Sciences of Moldova). The diameter of the FCW 80X20R3T was 3.2 mm and the length was 30 mm. The chemical composition of the used wire in wt %: C 0.8; B 3.0; Cr 20.0; Ti 1.0; and Fe remainder. The coating thickness
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