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<p>Surface layers having a&#xa0;thickness of ~ 2 mm, alloyed with tungsten, chromium, and boron, were formed on the samples of steel 12Kh18N9T (0.12C–18Cr–9Ni–Ti) by non-vacuum electron beam surfacing. The structure and phase composition of two types of alloys, obtained by depositing powder mixtures containing 10&#xa0;or 20 wt. % tungsten in combination with 5 wt. % chromium and 30 wt. % boron, were studied. The surface layers, deposited by electron beam surfacing, exhibit a&#xa0;pre-eutectic structure comprising a&#xa0;solid solution (matrix) and colonies of lamellar eutectics with complex borides (hardening particles). After depositing the powder mixture (10W–5Cr–30B), the ductile matrix of the alloy is represented by a&#xa0;solid solution of chromium and nickel in γ‑Fe, with the eutectics containing (Cr, Fe)<sub>2</sub>B particles. The alloy obtained by depositing a&#xa0;mixture with increased tungsten content (20W–5Cr–30B) exhibits two types of solid solutions: γ‑Fe(Cr, Ni) and α‑Fe(Cr, Ni). The eutectic colonies contain borides, such as (Cr, Fe)<sub>2</sub>B and (Cr, W)<sub>3</sub>B<sub>4</sub>. The heat resistance of the modified layers exceeds that of steel 12Kh18N9T (AISI 321) by a&#xa0;factor of 5&#xa0;(tested at 650 °C for 100 h). During oxidation of the surface-alloyed materials, an oxide film of the (Fe<sub>3–х</sub>Cr<sub>х</sub>)O<sub>4</sub> type is formed.</p>

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The structure and heat resistance of the surface layers formed by depositing powder mixtures of boron, chromium and tungsten onto corrosion-resistant steel

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • E. A. Pukhova,
  • P. M. Petukhova,
  • V. E. Andryushkina,
  • V. A. Bataev,
  • Yu. N. Malyutina,
  • E. V. Domarov

摘要

Surface layers having a thickness of ~ 2 mm, alloyed with tungsten, chromium, and boron, were formed on the samples of steel 12Kh18N9T (0.12C–18Cr–9Ni–Ti) by non-vacuum electron beam surfacing. The structure and phase composition of two types of alloys, obtained by depositing powder mixtures containing 10 or 20 wt. % tungsten in combination with 5 wt. % chromium and 30 wt. % boron, were studied. The surface layers, deposited by electron beam surfacing, exhibit a pre-eutectic structure comprising a solid solution (matrix) and colonies of lamellar eutectics with complex borides (hardening particles). After depositing the powder mixture (10W–5Cr–30B), the ductile matrix of the alloy is represented by a solid solution of chromium and nickel in γ‑Fe, with the eutectics containing (Cr, Fe)2B particles. The alloy obtained by depositing a mixture with increased tungsten content (20W–5Cr–30B) exhibits two types of solid solutions: γ‑Fe(Cr, Ni) and α‑Fe(Cr, Ni). The eutectic colonies contain borides, such as (Cr, Fe)2B and (Cr, W)3B4. The heat resistance of the modified layers exceeds that of steel 12Kh18N9T (AISI 321) by a factor of 5 (tested at 650 °C for 100 h). During oxidation of the surface-alloyed materials, an oxide film of the (Fe3–хCrх)O4 type is formed.