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Abstract <p>The structure of multilayer coatings of high-speed steel R18Yu formed on a substrate of steel 30KhGSA during plasma surfacing with PP-R18Yu brand flux-cored wire in a mixture of argon and nitrogen was studied using the light and scanning electron microscopy methods on transverse sections. It was shown that the coatings have a misoriented dendritic structure with a characteristic size of the first-order axes of 100 μm, which changes little with depth. Using scanning electron microscopy, the carbide network of eutectic carbides of Me<sub>6</sub>C type along the boundaries of solid solution grains with sizes within 5–100 μm was studied in detail. Small grains with characteristic sizes up to 10 μm have a homogeneous structure; in larger grains, an internal region with a ferrite-martensite structure and inclusions of equiaxed isolated carbides is formed. The typical size of martensite needles in it is 1–3 μm. An increase in the average microhardness from 472 to 528 HV<sub>0.1</sub> was detected after fourfold high-temperature tempering at 580°C as a result of martensite formation and the precipitation of dispersed carbides. An increase in martensite needles within the range of 2 to 6 μm was observed. After electron-beam processing, the carbide network was preserved, transcrystalline cracks were formed in small grains, martensite decomposed in larger grains, isolated carbides increased in size, and the average microhardness increased to 628 HV<sub>0.1</sub>.</p>

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Formation of Structure of High-Speed Steel Coatings by Plasma Surfacing, Subsequent Tempering, and Electron-Beam Processing

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • E. A. Budovskikh,
  • L. P. Baschenko,
  • V. E. Gromov,
  • G. I. Cherepanova,
  • V. V. Pochetuha,
  • N. N. Malushin

摘要

Abstract

The structure of multilayer coatings of high-speed steel R18Yu formed on a substrate of steel 30KhGSA during plasma surfacing with PP-R18Yu brand flux-cored wire in a mixture of argon and nitrogen was studied using the light and scanning electron microscopy methods on transverse sections. It was shown that the coatings have a misoriented dendritic structure with a characteristic size of the first-order axes of 100 μm, which changes little with depth. Using scanning electron microscopy, the carbide network of eutectic carbides of Me6C type along the boundaries of solid solution grains with sizes within 5–100 μm was studied in detail. Small grains with characteristic sizes up to 10 μm have a homogeneous structure; in larger grains, an internal region with a ferrite-martensite structure and inclusions of equiaxed isolated carbides is formed. The typical size of martensite needles in it is 1–3 μm. An increase in the average microhardness from 472 to 528 HV0.1 was detected after fourfold high-temperature tempering at 580°C as a result of martensite formation and the precipitation of dispersed carbides. An increase in martensite needles within the range of 2 to 6 μm was observed. After electron-beam processing, the carbide network was preserved, transcrystalline cracks were formed in small grains, martensite decomposed in larger grains, isolated carbides increased in size, and the average microhardness increased to 628 HV0.1.