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<p>Electric arc coatings (EAC), sprayed with the Fe–Cr–Si–Mn–B–C cored wires (CW) alloying system with an exothermic charge based on boron carbide powder, are investigated. The content of boron in the FCW varied within 0–2 mass% to obtain a&#xa0;microhardness of coatings in the range of 500–1000 HV0.3 for the restoration of lightly and heavily loaded parts of units. The chromium content in the CW varied within 6–17 mass% to form coatings on parts that operate in technological and corrosive environments. Since the performance characteristics of the coatings also depend on the substrate material and the air jet pressure during their deposition, they were sprayed onto aluminum and steel substrates at subsonic (0.6 MPa, 300 m/s) and supersonic (1.2 MPa, 600 m/s) air jet pressures. The supersonic speed was achieved due to the nozzle system of coating spraying using double Laval nozzles. The ratio of residual tensile stresses of the first kind σ<sub>res</sub> to their cohesive strength σ<sub><i>s</i></sub> (σ<sub>res</sub>∕σ<sub><i>s</i></sub>), was used as an indicator of the coating’s resistance to cracking. It was shown that cracks began to form in coatings, for which <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11003_2025_973_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="103" /> </InlineMediaObject> <EquationSource Format="TEX">\(\upsigma _{\mathrm{res}}/\upsigma _{s}&gt; 0.75\)</EquationSource> </InlineEquation>, while at <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11003_2025_973_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="103" /> </InlineMediaObject> <EquationSource Format="TEX">\(\upsigma _{\mathrm{res}}/\upsigma _{s}&gt; 0.85\)</EquationSource> </InlineEquation>, a&#xa0;network of cracks was formed in the coatings. It was found that σ<sub>res</sub> in the coatings sputtered on an aluminum substrate were lower than those sputtered on steel, which is due to the higher coefficient of thermal expansion of D16 aluminum alloy than that of steel St3.</p>

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Mechanical characteristics of electric arc coatings sputtered on St3 steel and D16 aluminum alloy

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • V. M. Hvozdetskyi,
  • M. M. Student,
  • Kh. R. Zadorozhna,
  • H. H. Veselivska,
  • S. I. Markovych,
  • N. Z. Mozola

摘要

Electric arc coatings (EAC), sprayed with the Fe–Cr–Si–Mn–B–C cored wires (CW) alloying system with an exothermic charge based on boron carbide powder, are investigated. The content of boron in the FCW varied within 0–2 mass% to obtain a microhardness of coatings in the range of 500–1000 HV0.3 for the restoration of lightly and heavily loaded parts of units. The chromium content in the CW varied within 6–17 mass% to form coatings on parts that operate in technological and corrosive environments. Since the performance characteristics of the coatings also depend on the substrate material and the air jet pressure during their deposition, they were sprayed onto aluminum and steel substrates at subsonic (0.6 MPa, 300 m/s) and supersonic (1.2 MPa, 600 m/s) air jet pressures. The supersonic speed was achieved due to the nozzle system of coating spraying using double Laval nozzles. The ratio of residual tensile stresses of the first kind σres to their cohesive strength σs (σres∕σs), was used as an indicator of the coating’s resistance to cracking. It was shown that cracks began to form in coatings, for which \(\upsigma _{\mathrm{res}}/\upsigma _{s}> 0.75\) , while at \(\upsigma _{\mathrm{res}}/\upsigma _{s}> 0.85\) , a network of cracks was formed in the coatings. It was found that σres in the coatings sputtered on an aluminum substrate were lower than those sputtered on steel, which is due to the higher coefficient of thermal expansion of D16 aluminum alloy than that of steel St3.