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|Title||Assessment of Technological Capabilities for Forming Al-C-B System Coatings on Steel Surfaces by Electrospark Alloying Method|
Haponova, Oksana Petrivna
X-ray diffraction analysis
X-ray spectral analysis
|Date of Issue||2021|
|License||Creative Commons Attribution 4.0 International License|
|Citation||Antoszewski, B.; Gaponova, O.P.; Tarelnyk, V.B.; Myslyvchenko, O.M.; Kurp, P.; Zhylenko, T.I.; Konoplianchenko, I. Assessment of Technological Capabilities for Forming Al-C-B System Coatings on Steel Surfaces by Electrospark Alloying Method. Materials 2021, 14, 739. https://doi.org/10.3390/ma14040739|
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.
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|Antoszewski_et.al._electrospark_alloying_2021.pdf||4,71 MB||Adobe PDF||8027718|
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