Abstract
Electron microscopic studies have been performed to investigate carbides, nitrides, and carbonitrides precipitated in chromium-nickel austenitic steels, which have been alloyed with nitrogen, silicon, boron, and rare-earth metals (REM) in different concentrations, and affecting the intergranular corrosion in these steels in highly-oxidizing environments. The intergranular corrosion has been found to result mainly from heating-induced precipitation of chromium carbides or carboborides, such as Cr23(C, B)6, which deplete the border areas of chromium to a greater extent than nitrides. The low corrosion rate corresponds to a lower dislocation number density. Concentrations of boron and REMs that do not have a negative effect on intergranular corrosion have been found.
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Maznichevskii, A.N., Goikhenberg, Y.N. & Sprikut, R.V. Electron-Microscopy Investigation of Excess-Phase Precipitates Affecting the Intergranular Corrosion of Chromium–Nickel Austenitic Steels. Phys. Metals Metallogr. 122, 362–369 (2021). https://doi.org/10.1134/S0031918X2103011X
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DOI: https://doi.org/10.1134/S0031918X2103011X