Abstract
The influence of long-term annealing (at 700°C, 30 h) on the structure and mechanical properties of ferritic chromium steels 08Kh17T and 15Kh25T has been comparatively studied after high-temperature nitriding and heat treatment (annealing). Both steels in all considered states are characterized by high resistance against oxidation during long-term annealing. Long-term annealing of the steels in the initial non-nitrided state and after nitriding and intermediate annealing at 700°C leads to a decrease in the ultimate tensile strength and yield strength by 10–15%. The maximum decrease in the strength (by 1.2–1.7 times) upon long-term annealing is observed in both steels after preliminary nitriding and annealing at 550°C due to partial coagulation of the nitride phase.
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ACKNOWLEDGMENTS
The SEM studies were performed using the equipment of the Materials Sciences and Metallurgy core facility of MISiS.
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Nikulin, S.A., Khatkevich, V.M., Rogachev, S.O. et al. Long-Term Annealing Resistance of Ferritic Chromium Steels Subjected to High-Temperature Nitriding. Russ. Metall. 2019, 427–430 (2019). https://doi.org/10.1134/S0036029519040268
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DOI: https://doi.org/10.1134/S0036029519040268