Effect of the Quenching Temperature on the Structure and Mechanical Properties of Martensitic–Ferritic Corrosion-Resistant Nitrogen-Bearing 08Kh17N2AF Steel.

Autor: Lukin, E. I., Blinov, V. M., Bannykh, I. O., Blinov, E. V., Antsyferova, M. V., Ashmarin, A. A., Seval'nev, G. S., Demin, K. Yu., Zavodov, A. V., Samoilova, M. A., Chernenok, D. V., Mamykin, N. I., Nerutskaya, A. V.
Zdroj: Russian Metallurgy (Metally); Jun2023, Vol. 2023 Issue 6, p629-637, 9p
Abstrakt: The structure and mechanical properties of martensitic–ferritic nitrogen-bearing 08Kh17N2AF steel after quenching in the temperature range 800–1200°C are studied. This steel after quenching from 950°C is found to have a high strength (σu = 1290 MPa, σ0.2 = 850 MPa) and impact toughness at +20°C (KCU = 0.8 MJ/m2) but a low impact toughness at –70°C (KCU = 0.3 MJ/m2) as a result of the formation of a martensitic–ferritic–austenitic structure containing ∼82% α, ∼17% δ, ∼1% γ, and a small amount of chromium carbonitrides. The 08Kh17N2AF steel is noted to have the best combination of strength (σu = 950 MPa, σ0.2 = 800 MPa) and impact toughness at +20 and –70°C (KCU+20°C = 1.65 MJ/m2, KCU–70°C = 0.7 MJ/m2) after quenching from 800°C and cooling in water as a result of the formation of a martensitic–ferritic–austenitic structure containing 75% martensitic with a high dislocation density, 17% ferrite with grain sizes 2–3 μm, and 8% austenite. The increased impact toughness at +20°C and –70°C is shown to be related to a low content of chromium and vanadium carbonitrides and thin-lamellar martensite having formed from fine austenite grains. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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