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Effect of helical rolling on the bainitic microstructure and impact toughness of the low-carbon microalloyed steel / L. S. Derevyagina, A. I. Gordienko, N. S. Surikova, M. N. Volochaev // Mater. Sci. Eng. A. - 2021. - Vol. 816. - Ст. 141275, DOI 10.1016/j.msea.2021.141275. - Cited References: 43 . - ISSN 0921-5093
Кл.слова (ненормированные):
Low-carbon microalloyed steel -- Helical rolling -- Microstructure -- Bainite -- Martensite–austenite constituent -- Impact toughness
Аннотация: Ferrite-bainite microstructures and impact toughness of the X65 low-carbon microalloyed steel were investigated after helical rolling at 1000, 920, 850, and 810 °C followed by continuous cooling in air. After helical rolling at 1000 °C, granular bainite with large areas of the massive-shape martensite-austenite constituent (d = 1.5 μm) and a high fraction of twinned martensite (d › 2.0 μm) were observed in the steel. This caused a decrease in impact energy at low test temperatures (for example, 70 J at –70°С). Lowering the helical rolling temperature contributed to a reduction of dimensions of both ferrite-bainite and martensite-austenite constituent areas, as well as the replacement of the latter by a slender type one and an improvement in fracture toughness at the low temperatures. The highest impact energy level (210 J at –70 °C) was achieved after helical rolling at 850 °C due to the formation of a homogeneous microstructure, which included dispersed ferrite grains, granular bainite and small fractions of the slender type martensite-austenite constituent (d = 0.1–0.7 μm). In this case, areas of twinned martensite were absent.

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Держатели документа:
Institute of Strength Physics and Materials Science of Siberian Branch Russian Academy of Sciences, 2/4, Pr. Akademicheskii, Tomsk, 634055, Russian Federation
Kirensky Institute of Physics of the Siberian Branch of the Russian Academy of Sciences (SB RAS), Akademgorodok 50, Bld. 38, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, 31, Pr. Krasnoyarsk Worker, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Derevyagina, L. S.; Gordienko, A. I.; Surikova, N. S.; Volochaev, M. N.; Волочаев, Михаил Николаевич
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