L. S. Goruleva, S. M. Zadvorkin , D. I. Vichuzhanin, R. A. Savrai, P. A. Skorynina
AN EXPERIMENTAL AND COMPUTATIONAL STUDY OF THROUGH-DEPTH STRAIN DISTRIBUTION DURING FRICTIONAL TREATMENT OF A METASTABLE AUSTENITIC STEEL
DOI: 10.17804/2410-9908.2023.6.132-144 Frictional treatment, as a method of surface plastic deformation, forms a gradient hardened layer. In the case of metastable steels, this hardening is due, among other things, to the formation of strain-induced α'-martensite. The most reliable information about the thickness of this hardened layer can be obtained by measuring the hardness on transverse sections. This paper compares strain distribution through the depth of the hardened layer, obtained from layer-by-layer phase analysis and finite element modeling, with the data of durametric studies for the AISI 321 metastable steel subjected to frictional treatment under various loads on the indenter. A satisfactory coincidence of the distributions of the α'-phase concentration and hardness through the depth is observed only for the specimen subjected to frictional treatment at a maximum load of 400 N on the indenter. At the other loads on the indenter, the thickness of the layer containing α'-martensite is lower than the thickness of the hardened layer estimated from the durametric studies. In contrast, it is shown that, for all the loads applied to the indenter during frictional treatment, the through-depth distributions of the calculated values of equivalent plastic strain obtained from finite element modeling agree satisfactorily with the experimental hardness values.
Acknowledgements: he work was performed under state assignment No. AAAA-A18-118020790148-1. The equipment of the Plastometriya shared research facilities (the IES UB RAS) was used in the study. Keywords: austenitic metastable steels, frictional treatment, hardened layer, hardness, finite element modeling, phase composition Bibliography:
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Л. С. Горулева, С. М. Задворкин, Д. И. Вичужанин, Р. А. Саврай, П. А. Скорынина
ЭКСПЕРИМЕНТАЛЬНОЕ И РАСЧЕТНОЕ ИССЛЕДОВАНИЕ РАСПРЕДЕЛЕНИЯ ДЕФОРМАЦИИ ПО ГЛУБИНЕ ПРИ ФРИКЦИОННОЙ ОБРАБОТКЕ МЕТАСТАБИЛЬНОЙ АУСТЕНИТНОЙ СТАЛИ
Фрикционная обработка, как один из методов поверхностной пластической деформации, приводит к формированию градиентного упроченного слоя. В случае метастабильных сталей это упрочнение обусловлено, кроме всего прочего, образованием α′-мартенсита деформации. Наиболее достоверную информацию о толщине этого упрочненного слоя можно получить, проводя измерение твердости на поперечных шлифах. В настоящей работе проведено сопоставление распределений деформации по глубине упрочненного слоя, полученных по результатам послойного фазового анализа и конечно-элементного моделирования, с данными дюрометрических исследований для метастабильной стали AISI 321, подвергнутой фрикционной обработке при различных нагрузках на индентор. Установлено, что удовлетворительное совпадение распределений концентрации α′-фазы и твердости по глубине наблюдается только для образца, подвергнутого фрикционной обработке при максимальной нагрузке на индентор 400 Н. При остальных нагрузках на индентор толщина слоя, содержащего α′-мартенсит, меньше толщины упрочненного слоя, оцененного по результатам дюрометрических исследований. В отличие от этого, показано, что для всех примененных при фрикционной обработке нагрузок на индентор наблюдается удовлетворительное согласие распределений по глубине расчетных величин эквивалентной пластической деформации, полученных в результате конечно-элементного моделирования, и экспериментальных значений твердости.
Благодарности: Работа выполнена в рамках государственного задания № АААА-А18-118020790148-1. При проведении исследований использовано оборудование ЦКП «Пластометрия» ИМАШ УрО РАН. Ключевые слова: аустенитные метастабильные стали, фрикционная обработка, упрочненный слой, твердость, конечно-элементное моделирование, фазовый состав Библиография:
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Библиографическая ссылка на статью
An Experimental and Computational Study of Through-Depth Strain Distribution During Frictional Treatment of a Metastable Austenitic Steel / L. S. Goruleva, S. M. Zadvorkin, D. I. Vichuzhanin, R. A. Savrai, P. A. Skorynina // Diagnostics, Resource and Mechanics of materials and structures. -
2023. - Iss. 6. - P. 132-144. - DOI: 10.17804/2410-9908.2023.6.132-144. -
URL: http://dream-journal.org/issues/2023-6/2023-6_425.html (accessed: 21.11.2024).
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