In this paper, the possibility of applying the electrospark alloying (ESA) method to obtain boron-containing coatings characterised by increased hardness and wear resistance is considered. A new method for producing such coatings is proposed. The method consists in applying grease containing aluminium powder and amorphous boron to the surface to be treated and subsequently processing the obtained surface using the ESA method by a graphite electrode. The microstructural analysis of the Al-C-B coatings on steel C40 showed that the surface layer consists of several zones, the number and parameters of which are determined by the energy conditions of the ESA process. Durametric studies showed that with an increase in the discharge energy influence, the microhardness values of both the upper strengthened layer and the diffusion zone increased to Wp = 0.13 J, Hµ = 6487 MPa, and Wp = 4.9 J, Hµ = 12350 MPa, respectively. The results of X-ray diffraction analysis indicate that at the discharge energies of 0.13 and 0.55 J, the phase composition of the coating is represented by solid solutions of body-centred cubic lattice (BCC) and face-centred cubic lattice (FCC). The coatings obtained at Wp = 4.9 J were characterised by the presence of intermetallics Fe4Al13 and borocementite Fe3 (CB) in addition to the solid solutions. The X-ray spectral analysis of the obtained coatings indicated that during the electrospark alloying process, the surface layers were saturated with aluminium, boron, and carbon. With increasing discharge energy, the diffusion zone increases; during the ESA process with the use of the discharge energy of 0.13 J for steel C40, the diffusion zone is 10–15 μm. When replacing a substrate made of steel C40 with the same one material but of steel C22, an increase in the thickness of the surface layer accompanied by a slight decrease in microhardness is observed as a result of processing with the use of the ESA method. There were simulated phase portraits of the Al-C-B coatings. It is shown that near the stationary points in the phase portraits, one can see either a slowing down of the evolution or a spiral twisting of the diffusion-process particle.
Исследовано влияние материала легирующего электрода (АРМКО-железо, сталь 45, хром, вольфрам, молибден, никель, стали 38ХН3МФА и 30Х13, твёрдые сплавы ВК8 и Т15К6), энергетических параметров обору-дования электроэрозионного легирования (мощность разряда), среды (воздух, аргон, азот) и длительности обработки на качественные парамет-ры сформированного поверхностного слоя на стали 45 (структуры, рас-пределения микротвёрдости, сплошности и равномерности покрытия).
Получены зависимости массопереноса в тугоплавких металлах и сплавах (Cr, Ti, W, твёрдый сплав), а также металлах группы железа (Ni) при кон-тактном и бесконтактном электроэрозионном легировании (ЭЭЛ) поверх-ностей из железа Армко, сталей 45 и 12Х18Н10Т от длительности обра-ботки. Проведены топографический анализ наиболее характерных участ-ков поверхности и качественный рентгеновский микроанализ покрытия из износостойких и антифрикционных материалов. Исследовано влияние атмосферы процесса ЭЭЛ на фазовый состав слоя.Ключевые слова: покрытие, электроэрозионное легирование, массопере-нос, шероховатость, рентгеноструктурный анализ.Одержано залежності масоперенесення в тяжкотопких металах і стопах (Cr, Ti, W, твердий стоп), а також металах групи заліза (Ni) при контакт-ному та безконтактному електроерозійному леґуванні (ЕЕЛ) поверхонь із заліза Армко, криць 45 і 12Х18Н10Т від тривалости оброблення. Прове-
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