Structure and mechanical properties of the nitrogen-containing austenitic plate steel 04Kh20N6G11AM2BF

• Published in: Physics of metals and metallography Vol. 102; no. 2; pp. 233 - 239
• Main Authors: Sagaradze, V. V., Uvarov, A. I., Pecherkina, N. L., Malyshevskii, V. A., Kalinin, G. Yu, Yampol’skii, V. D.
• Format: Journal Article
• Language: English
• Published: Moscow Springer Nature B.V 01.08.2006
• Subjects: Mechanical properties; Metallurgy
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X06080163

Structure and mechanical properties of the nitrogen-containing austenitic plate steel 04Kh20N6G11AM2BF with a thickness of 20 and 40 mm after hot rolling, quenching from different temperatures, and final strengthening by cold or warm deformation have been studied. For these large-section plates, sufficiently high mechanical properties were obtained, namely, the yield stress σ^sub 0.2^ ≥ 690 MPa, the relative elongation δ ≥ 20%, the relative reduction ≥ 50%, and the impact toughness KCV ^sup +20^ ≥ 100 J/cm^sup 2^. This complex of strength and plastic properties of hot-rolled steel was produced after the quenching of the plates from 1150°C and subsequent strengthening warm (600°C) or cold (20°C) rolling with a reduction of up to 15%. These properties of steel were due to several causes, namely, the presence of nitrogen in the fcc solid solution, an increased density of dislocations ([asymptotically =] 10^sup 10^ cm^sup -2^), the precipitation of nanocrystalline vanadium nitrides with sizes of 2-4 nm, and the absence of large amounts of coarse near-boundary particles.[PUBLICATION ABSTRACT]