blackmetИзвестия высших учебных заведений. Черная МеталлургияIzvestiya. Ferrous Metallurgy0368-07972410-2091National University of Science and Technology "MISIS"10.17073/0368-0797-2023-3-311-319blackmet-2604Research ArticleМАТЕРИАЛОВЕДЕНИЕMATERIAL SCIENCEВлияние ускоренного охлаждения после поперечно-винтовой прокатки на формирование структуры и низкотемпературную вязкость разрушения низкоуглеродистой сталиEffect of accelerated cooling after cross-helical rolling on formation of structure and low-temperature fracture toughness of low-carbon steelhttps://orcid.org/0000-0002-4361-8906ГордиенкоА. И.GordienkoA. I.

Антонина Ильдаровна Гордиенко, к.т.н., научный сотрудник лаборатории физической мезомеханики и неразрушающих методов контроля

Россия, 634055, Томск, пр. Академичес­кий 2/4

Antonina I. Gordienko, Cand. Sci. (Eng.), Research Associate of the Laboratory of Physical Mesomechanics and Non-Destructive Control Methods

2/4 Akademiches­kii Ave., Tomsk 634055, Russian Federation

mirantil@ispms.ruhttps://orcid.org/0000-0001-9110-8313ВласовИ. В.VlasovI. V.

Илья Викторович Власов, к.т.н., научный сотрудник лаборатории физической мезомеханики и неразрушающих методов конт­роля

Россия, 634055, Томск, пр. Академичес­кий 2/4

Il’a V. Vlasov, Cand. Sci. (Eng.), Research Associate of the Laboratory of Physical Mesomechanics and Non-Destructive Control Methods

2/4 Akademiches­kii Ave., Tomsk 634055, Russian Federation

viv@ispms.ruhttps://orcid.org/0000-0003-0236-816XПочиваловЮ. И.PochivalovYu. I.

Юрий Иванович Почивалов, к.ф.-м.н., ведущий научный сотрудник физической мезомеханики и неразрушающих методов конт­роля

Россия, 634055, Томск, пр. Академичес­кий 2/4

Yurii I. Pochivalov, Cand. Sci. (Phys.-Math.), Leading Researcher of the Laboratory of Physical Mesomechanics and Non-Destructive Control Methods

2/4 Akademiches­kii Ave., Tomsk 634055, Russian Federation

pochiv@ispms.ruИнститут физики прочности и материаловедения Сибирского отделения РАНРоссияInstitute of Strength Physics and Materials Science, Siberian Branch of the Russian Academy of SciencesRussian Federation202318092023663311319Copyright © Гордиенко А.И., Власов И.В., Почивалов Ю.И., 20232023Гордиенко А.И., Власов И.В., Почивалов Ю.И.Gordienko A.I., Vlasov I.V., Pochivalov Y.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://fermet.misis.ru/jour/article/view/2604

Исследуется влияние ускоренного охлаждения после поперечно-винтовой прокатки низкоуглеродистой стали класса прочности К60 на формирование структуры и механические свойства при статическом растяжении и ударном изгибе. Показано, что использование прерванного ускоренного охлаждения стали после прокатки с выдержкой при 530 °С (режим I) и непрерывного ускоренного охлаждения (режим II) приводит к формированию разного типа и соотношения количества структур в стали. После прокатки по режиму I структура характеризуется присутствием феррита, троостита, гранулярного бейнита и мелкодисперсных карбидов Fe3C. После прокатки по режиму II структура отличается наличием реечного бейнита и крупных участков мартенситно-аустенитной (МА) составляющей размерами до 1 – 2 мкм. Уменьшение дисперсности ферритных зерен в стали после прокатки по режимам I и II с 12 до 4,6 – 4,3 мкм, формирование бейнитной фазы и упрочнение матрицы карбидами приводит к повышению пределов текучести стали до 440 и 490 МПа и пределов прочности до 760 и 880 МПа. Проведение поперечно-винтовой прокатки по режиму I позволяет существенно увеличить низкотемпературную вязкость разрушения стали (160 Дж/см2) по сравнению с горячекатаным состоянием (11 Дж/см2) и снизить хладноломкость стали в область температур ниже –50 °С. Применение непрерывного ускоренного охлаждения (режим II) не позволяет повысить хладостойкость стали вследствие формирования структуры реечного бейнита и крупных областей МА составляющей.

The effect of accelerated cooling after cross-helical rolling of X70 low-carbon steel on the formation of structures and mechanical properties under static tension and impact bending was investigated. The use of interrupted accelerated cooling of steel after cross-helical rolling with exposure at 530 °C (mode I) and continuous accelerated cooling (mode II) leads to the formation of different types and ratios of structures in steel. After rolling according to mode I, the structure is characterized by the presence of ferrite, troostite, granular bainite, and fine Fe3C carbides. After rolling according to mode II, the structure is characterized by the formation of lath bainite and large sections of the martensitic-austenitic (MA) component up to 1 – 2 µm in size. It is shown that a decrease in the fineness of ferrite grains in steel after cross-helical rolling in modes I and II from 12 to 4.6 – 4.3 μm, the formation of a bainitic phase, and hardening of the matrix with carbides led to an increase in the yield strength of steel up to 440 and 490 MPa and tensile strength up to 760 and 880 MPa. Carrying out helical rolling according to mode I makes it possible to significantly increase the low-temperature fracture toughness of steel (KCV–70 °С = 160 J/cm2) compared to the hot-rolled state (KCV–70 °С = 11 J/cm2) and reduce the cold brittleness of steel to the temperatures below –50 °C. The use of continuous accelerated cooling (mode II) does not allow increasing the cold resistance of steel due to the formation of the lath bainite structure and large areas of the MA component.

низкоуглеродистая стальпоперечно-винтовая прокаткаускоренное охлаждениемикроструктурапрочностьвязкость разрушенияlow-carbon steelcross-helical rollingaccelerated coolingmicrostructurestrengthfracture toughnessРабота выполнена в рамках государственного задания Института физики прочности и материаловедения Сибирского отделения РАН, проект FWRW- 2021-0009. Авторы благодарят И.П. Мишина и Е.Е. Найденкина за содействие в проведении поперечно-винтовой прокатки стали. Микроструктурные исследования проведены с помощью оборудования ЦКП «Нанотех» Института физики прочности и материаловедения Сибирского отделения РАН (Centre “Nanotech” of the ISPMS SB RAS).The work was performed within the framework of the state task of the Institute of Strength Physics and Materials Science, Siberian Branch of Russian Academy of Sciences, project FWRW- 2021-0009. The authors express their gratitude to Mishin I.P. and Naydenkin E.E. for their assistance in carrying out steel cross-helical rolling. 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The authors declare that there are no conflicts of interest present.