Abstract
The scaling resistance of a coating deposited by a flux-cored wire 30N8X6M3STYu subjected to surface oxidation at a temperature of 900 °C was studied. It was established that the main increase in the mass of scale for a given metal occurs in the first hours, and later this dependence is almost straightforward. The average weight gain of the metal scale of such a coating at 900 °C is 0.002 kg/(m2·h), which is 16.5 times less than that of 30Kh2V8F steel. An X-ray analysis of a metal of the composition 30N8X6M3STYu showed that the scale consists not only of the oxide phase, but also of the remnants of non-oxidized grains of solid solution, nitrides and carbides. It was found that the basis of scale, along with hematite Fe2O3, magnetite Fe3O4, are various compounds of the main alloying elements such as Cr2FeO4, Fe2NiO4 and Fe3N, which have good protective properties. The results show that the coating of steel 30N8Kh6M3STYu can be used for applying on the surface of parts operating at high temperatures.
Highlights
The efficiency of metallurgical production is largely determined by the operability of the hot metal deformation tool
Scale has abrasive properties due to its significant hardness, which is maintained at high temperatures of hot processing
A rapid decrease in the concentration of the main alloying elements is associated with their active participation in diffusion processes due to high temperatures [12]
Summary
The efficiency of metallurgical production is largely determined by the operability of the hot metal deformation tool. It is possible to increase the service life of the working surfaces of the tool by surfacing with new types of wear-resistant steels [4,5,6] From this point of view, the processes of applying wear-resistant coatings on economically alloyed martensitic steels deposited by flux-cored wire to the working surfaces are widely used [6, 7]. In this regard, precipitation hardening nickel-chrome steels alloyed by molybdenum, silicon, titanium, and aluminum are promising [8, 9].
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