blackmetИзвестия высших учебных заведений. Черная МеталлургияIzvestiya. Ferrous Metallurgy0368-07972410-2091National University of Science and Technology "MISIS"10.17073/0368-0797-2024-6-716-724blackmet-2825Research ArticleМАТЕРИАЛОВЕДЕНИЕMATERIAL SCIENCEУдарная вязкость и особенности разрушения 12 % хромистой ферритно-мартенситной стали ЭП-823 в температурном интервале от –196 до 100 °СImpact strength and fracture features of 12 % chromium ferritic-martensitic steel EP-823 in temperature range from –196 to 100 °Сhttps://orcid.org/0000-0002-9181-4362СпиридоноваК. В.SpiridonovaK. V.

Ксения Викторовна Спиридонова, к.ф.-м.н., научный сотрудник лаборатории материаловедения сплавов с памятью формы

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

Kseniya V. Spiridonova, Cand. Sci. (Phys.-Math.), Research Associate of the Laboratory of Materials Science of Shape Memory Alloys

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

almaevakv@ispms.ruhttps://orcid.org/0000-0002-5892-3719ЛитовченкоИ. Ю.LitovchenkoI. Yu.

Игорь Юрьевич Литовченко, д.ф.-м.н., доцент, заведующий лабораторией материаловедения сплавов с памятью формы

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

Igor’ Yu. Litovchenko, Dr. Sci. (Phys.-Math.), Assist. Prof., Head of the Laboratory of Materials Science of Shape Memory Alloys

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

litovchenko@ispms.ruhttps://orcid.org/0000-0001-9076-5469ПолехинаН. А.PolekhinaN. A.

Надежда Александровна Полехина, к.ф.-м.н., старший научный сотрудник лаборатории материаловедения сплавов с памятью формы

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

Nadezhda A. Polekhina, Cand. Sci. (Phys.-Math.)., Senior Researcher of the Laboratory of Materials Science of Shape Memory Alloys

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

nadejda89tsk@yandex.ruhttps://orcid.org/0000-0001-8975-1553ОсиповаВ. В.OsipovaV. V.

Валерия Васильевна Осипова, аспирант

Россия, 634050, Томск, пр. Ленина, 36

Valeriya V. Osipova, Postgraduate

36 Lenina Ave., Tomsk 634050, Russian Federation

lera.linnik.1999@mail.ruhttps://orcid.org/0000-0002-2078-4194АккузинС. А.AkkuzinS. A.

Сергей Александрович Аккузин, младший научный сотрудник лаборатории материаловедения сплавов с памятью формы

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

Sergei A. Akkuzin, Junior Researcher of the Laboratory of Materials Scien­ce of Shape Memory Alloys

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

s.akkuzin@ispms.ruhttps://orcid.org/0000-0002-9558-3055ЧерновВ. М.ChernovV. M.

Вячеслав Михайлович Чернов, д.ф.-м.н, профессор, главный научный сотрудник

Россия, 123098, Москва, ул. Рогова, 5а

Vyacheslav M. Chernov, Dr. Sci. (Phys.-Math.), Prof., Chief Researcher

5a Rogova Str., Moscow 123098, Russian Federation

VMChernov@bochvar.ruИнститут физики прочности и материаловедения Сибирского отделения РАНРоссияInstitute of Strength Physics and Materials Science, Siberian Branch of Russian Academy of SciencesRussian FederationНациональный исследовательский Томский государственный университетРоссияNational Research Tomsk State UniversityRussian FederationАО «Высокотехнологический научно-исследовательский институт неорганических материалов им. акад. А.А. Бочвара»РоссияJSC “A.A. Bochvar High-Technology Scientific-Research Institute of Inorganic Materials”Russian Federation202421122024676716724Copyright © Спиридонова К.В., Литовченко И.Ю., Полехина Н.А., Осипова В.В., Аккузин С.А., Чернов В.М., 20242024Спиридонова К.В., Литовченко И.Ю., Полехина Н.А., Осипова В.В., Аккузин С.А., Чернов В.М.Spiridonova K.V., Litovchenko I.Y., Polekhina N.A., Osipova V.V., Akkuzin S.A., Chernov V.M.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/2825

В настоящей работе исследованы закономерности разрушения при испытаниях на ударный изгиб, определены значения ударной вязкости и температура вязко-хрупкого перехода в температурном интервале от –196 до 100 °С жаропрочной 12 %-ной хромис­той ферритно-мартенситной стали ЭП-823 в структурных состояниях после традиционной термической (ТТО) и высокотемпературной термомеханической (ВТМО) обработок. После ТТО температура вязко-хрупкого перехода Тхв составляет приблизительно –45 °С, после ВТМО – приблизительно –40 °С. При этих температурах энергия удара (KCV) после ТТО составляет приблизительно 36 Дж/см2, после ВТМО – 32 Дж/см2. Проведенные методом растровой электронной микроскопии фрактографические исследования особенностей разрушения ударных образцов стали после двух обработок (ТТО и ВТМО) в низкотемпературной области испытаний (при криогенных температурах) показали преимущественно хрупкий характер разрушения, при этом разрушение происходит по механизму транскристаллитного квазискола. В области температур вязко-хрупкого перехода наблюдается смешанный характер разрушения, который проходит по механизму транскристаллитного квазискола с элементами вязкого ямочного разрушения. В интервале температур от 50 до 100 °С обнаружен преимущественно вязкий характер разрушения, реализуемый по транскристаллитному ямочному механизму разрушения. После ВТМО наблюдается незначительное снижение (относительно ТТО) ударной вязкости стали практически во всем рассматриваемом температурном диапазоне и, соответственно, повышение температуры ее вязко-хрупкого перехода. Это обусловлено геометрией испытаний, при которой направление удара происходит в плоскости слоистой структуры, что облегчает зарождение трещин расслоения.

The authors investigated the patterns of fracture during impact bending tests and determined the values of impact strength and temperature of the ductile-brittle transition in temperature range from –196 to 100 °С of heat-resistant 12 % chromium ferritic-martensitic steel EP-823 in structural states after traditional heat (THT) and high-temperature thermomechanical (HTMT) treatments. After THT, temperature of the ductile-brittle transition Tdbt is approximately –45 °С, after HTMT – approximately –40 °С. At these temperatures, the impact energy (KCV) after THT is approximately 36 J/cm2, after HTMT – 32 J/cm2. Fractographic studies conducted by scanning electron microscopy of the fracture features of impact steel samples after two treatments (THT and HTMT) in the low-temperature test area (at cryogenic temperatures) showed a predominantly brittle nature of fracture, while fracture occurs by the mechanism of a transcrystalline quasi-cleavage. In the temperature range of the ductile-brittle transition, a mixed nature of fracture is observed, which passes through the mechanism of a transcrystalline quasi-cleavage with elements of ductile dimple fracture. In the temperature range from 50 to 100 °С, the extremely ductile nature of the fracture was detected, realized by the transcrystalline dimple fracture mechanism. After HTMT, there is a slight decrease (relative to THT) in the steel impact strength in almost the entire temperature range under consideration and, accordingly, an increase in the temperature of its ductile-brittle transition. This is due to the tests’ geometry, in which the direction of impact occurs in the plane of the layered structure, and it facilitates the formation of delamination cracks.

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The authors declare that there are no conflicts of interest present.