The influence of variable sulfur content on the high-temperature resistance of cast heat-resistant nickel alloy VZhM200

Min P.G., Vadeev V.E., Sankin R.V., Chemov D.A.
Min P.G., Vadeev V.E., Sankin R.V., Chemov D.A. The influence of variable sulfur content on the high-temperature resistance of cast heat-resistant nickel alloy VZhM200 // Proceedings of VIAM. 2025. No. 9. DOI: 10.18577/2307-6046-2025-0-9-3-18. URL: https://test.viam.ru/en/journal/2025/9/1
Keywords
gas corrosion resistance, superalloy, surface oxidation, blades, structure, sulfur, impurity
Abstract

The paper studies the influence of sulfur impurity on the high-temperature resistance at T = 1000 °C for 500 hours of cast heat-resistant hafnium-containing nickel alloy VZhM200. It has been found that with the increase of the sulfur content, the high temperature resistance of the alloy decreases, and with the increase of its content from 0,0038 to 0,0130 wt. %, a slowdown in the high-temperature oxidation process is observed. This is due to the fact that sulfur is concentrated in the composition of hafnium-containing carbides, thereby reducing its diffusion from the volume to the surface of the material, which prevents the destruction of the forming oxide layer.

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