D. A. Movenko, A. V. Zavodov, A. B. Laptev, A. O. Loschinina
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Changing the Structure of a Single-Crystal Ni-Based Superalloy During Its High-Temperature Salt Corrosion at 750°C
The VZhM4 single-crystal Ni-based superalloy was tested for high-temperature salt-induced corrosion resistance in Na2SO4 + NaCl at 750°C. The equilibrium composition of phases formed during the interaction of the alloy with oxygen and sulfur across the temperature range of 600 – 1000°C were calculated. Changes in the structure and composition of the surface layer of the alloy during high-temperature salt corrosion were studied using scanning and transmission electron microscopy. The results obtained were used to compile structural diagrams for the corrosion layer formed on the alloy after 5 and 20 test cycles. The quantitative composition of the main phases in the corrosion products was determined. A qualitative assessment of Re, Ta, and Ru diffusion was performed.
期刊介绍：
Metal Science and Heat Treatment presents new fundamental and practical research in physical metallurgy, heat treatment equipment, and surface engineering.
Topics covered include:
New structural, high temperature, tool and precision steels;
Cold-resistant, corrosion-resistant and radiation-resistant steels;
Steels with rapid decline of induced properties;
Alloys with shape memory effect;
Bulk-amorphyzable metal alloys;
Microcrystalline alloys;
Nano materials and foam materials for medical use.
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