Estimation of residual stresses in plastically deformed eutectoid steel with different perlite morphology via magnetic parameters

Сташков, А. Н.; Schapova, E. A.; Afanasiev, S.; Stashkova, L. A.; Ничипурук, А. П.

doi:10.1016/j.jmmm.2021.168850

Cited by 8 publications

(8 citation statements)

References 24 publications

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“…The results obtained indicate the local strain distribution and damage accumulation. Similar studies were also carried out for other materials, for example, eutectoid steels after cold plastic deformation [23]. In this case, the average residual stresses in the deformation zone were about 220 MPa.…”

Section: Methods For the Determination Of Plasticity Marginsupporting

confidence: 66%

Plasticity Resource of Cast Iron at Deforming Broaching

Nemyrovskyi

Shepelenko

Storchak

2023

Metals

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The contact interaction mechanics of deformation broaching in low-plasticity materials is studied. Particular attention is paid to the study of the stress–strain state parameters and the plasticity margin in the deformation zone during the machining of gray cast iron EN-GJL-200. The stress–strain state was analyzed using a finite-element model of the deforming broaching process for each area of the deformation zone. The model parameters of the machined material were determined experimentally by compressing specimens of gray cast iron EN-GJL-200. The changes in the parameters of accumulated strain, stress tensor components, stress triaxiality ratio, hydrostatic stress, and plasticity margin at different deformation zones along the machined specimen depth are analyzed. It is shown that there is a zone of local plastic deformation in conditions of critical contact stresses. This leads to the appearance of tensile stresses that reduce the plasticity margin in the surface layer. The impact of tool geometry on the stress–strain state of the surface layer is also discussed, and recommendations for the optimal working angle of the deforming element are provided based on plasticity margin minimization.

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Section: Methods For the Determination Of Plasticity Marginsupporting

confidence: 66%

Plasticity Resource of Cast Iron at Deforming Broaching

Nemyrovskyi

Shepelenko

Storchak

2023

Metals

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Section: результаты и их обсуждениеunclassified

“…Имеется всего одна работа [17], где проведены такие измерения в стали У8 с грубопластинчатым перлитом. Однако в ней значения H 1 и H 2 при разных значениях ε pl не приводятся: авторы [17] привели только значения среднего арифметического из этих значений (без учета знака поля H 2 ) и назвали их магнитоупругими полями H σ . Это сделано ими без какого-либо физического обоснования несмотря на то, что такое обоснование физической природы появления пиков кривой µ 90 (H 0 ) есть (см.…”

Section: результаты и их обсуждениеunclassified

“…1). Легко доказать неправильность такого " приема" авторов [17], исходя из полученных ими величин напряжений: например, при ε pl = 8% у них σ i = −349 МPа, в результате максимальное значение этих напряжений должно быть равно σ m i = −1047 МPа, что намного больше предела прочности этой стали, равного 760 МPа. Это обстоятельство сводит на нет главный результат работы [17], заявленный ее авторами.…”

Section: результаты и их обсуждениеunclassified

“…Причина этого в том, что авторы не учли механизмов образования остаточных напряжений (1)−(4) и особенностей поведения пар зерен с LAB. Отметим, что авторами [17] учтен способ выделения вклада в магнитную проницаемость только от 90-градусных переходов, разработанный в [11,12] (это " вычитание" по терминологии [17]).…”

Section: результаты и их обсуждениеunclassified

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Влияние Остаточных Напряжений В Стали У8 С Грубопластинчатым Перлитом На Магнитную Проницаемость

Кулеев¹

2023

Журнал Технической Физики

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The physical reasons for the formation of peaks of that part of the magnetic permeability, which is caused by transitions of only 90-degree domain boundaries µ90(H0) in deformed steel U8 with coarse-plate perlite when the field changes along the back of the hysteresis loop, are considered. It is shown that the orientation relations of the Patch-Pitch between single-crystal ferrite and cementite plates in U8 steel lead to the appearance of a constant angle between the magnetic moments of these plates and, consequently, to the appearance of corresponding local scattering fields. The latter can significantly affect the values of the peak fields of the curve µ90(H0). Theoretical expressions for these fields containing contributions of scattering fields that should be taken into account when determining residual compressive stresses are obtained. It is also shown that to determine the residual stresses, two expressions for peak fields are not enough, and additional experiments are needed, as which it is proposed to use the dependences of the coercive force on elastic tensile stresses. This leads to a complication of the algorithm for determining residual compressive stresses in comparison with the case of low-carbon steels. A method for estimating the values of local scattering fields in the ferrite parts of U8 steel grains with residual compressive stresses is proposed.

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Magnetic Incremental Permeability of Elastically Deformed Iron and Nickel

Stashkov,

Schapova,

Nichipuruk

et al. 2023

J Nondestruct Eval

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The eld dependences of the magnetic incremental permeability U ~(H) have been measured on nickel and iron subjected to both elastic compression and tension. The in ections and additional maxima on the U ~(H) curves are observed for nickel under tension and for iron under compression. The appearance of the features on the U ~(H) curves is traceable to the induction of magnetic texture of the "easy-plane" type caused by elastic deformation of nickel and iron samples. These features appear only if the signs of magnetostriction and applied load are opposite. Only in this case, there is the possibility of estimation of applied mechanical stresses and residual stresses (after annealing). This can be useful for technical diagnostics of objects made of ferromagnetic materials with different signs of magnetostriction. The proposed technique is makes it possible to estimate the "easy-axis" magnetostriction constant.

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Estimation of residual stresses in plastically deformed eutectoid steel with different perlite morphology via magnetic parameters

Cited by 8 publications

References 24 publications

Plasticity Resource of Cast Iron at Deforming Broaching

Plasticity Resource of Cast Iron at Deforming Broaching

Влияние Остаточных Напряжений В Стали У8 С Грубопластинчатым Перлитом На Магнитную Проницаемость

Magnetic Incremental Permeability of Elastically Deformed Iron and Nickel

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