Ageing behavior of a Cu-bearing ultrahigh strength steel

Ghosh, Arindam; Das, Samar K.; Chatterjee, S.

doi:10.1016/j.msea.2007.08.062

Cited by 33 publications

(9 citation statements)

References 18 publications

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“…Установленная при MC-моделировании зависимость размера зернограничных выделений от типа границ зерен может играть существенную роль в практи-ческих вопросах, касающихся прочностных и пла-стических свойств упрочненных выделениями сплавов Fe−Cu [47,48]. В частности, на большеугловых ГЗ вы-деления могут достигать критического размера раньше, чем в объеме зерен.…”

Section: заключениеunclassified

Моделирование методом Монте-Карло кинетики распада и образования выделений на границах зерен общего типа в разбавленных ОЦК-сплавах Fe-Сu

Карькин¹,

Карькина²,

Коржавый³

et al. 2017

Физика Твердого Тела

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Кинетика распада в поликристаллическом сплаве Fe−Cu и формирование выделений на границах зерен (ГЗ) исследованы теоретически с использованием атомистического моделирования на различных временных масштабах: методом Монте-Карло, реализующим диффузионное перераспределение атомов Cu, и методом молекулярной динамики, обеспечивающим атомную релаксацию кристаллической решетки. Показано, что при малом размере зерна (D ∼ 10 nm) распад в объеме подавлен, а когерентно связанные с матрицей обогащенные Cu выделения преимущественно образуются на ГЗ. Размер и состав выделений существенно зависят от типа ГЗ: мелкие выделения (1.2−1.4 nm) имеют средний состав Fe−40 at.% Cu и образуются вблизи малоугловых границ зерен, более крупные выделения размером до 4 nm со средним составом Fe−60 at% Cu формируются вблизи границ зерен общего типа и тройных узлов.Работа выполнена при финансовой поддержке Российского научного фонда (грант № 14-12-00673).

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Section: заключениеunclassified

Моделирование методом Монте-Карло кинетики распада и образования выделений на границах зерен общего типа в разбавленных ОЦК-сплавах Fe-Сu

Карькин¹,

Карькина²,

Коржавый³

et al. 2017

Физика Твердого Тела

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“…This may be due to the precipitation behavior of Cu particles during the PWHT. The decrease in hardness of steel B may be compensated for by the precipitation of Cu particles [20]. Figure 7 gives HRTEM micrographs of Cu particles according to the PWHT at 550°C.…”

Section: Variation Of Microstructures and Mechanical Properties In Thmentioning

confidence: 99%

“…Cu precipitation behavior investigations have been performed by many researchers using various analysis methods, such as differential scanning calorimetry (DSC) and Atom Probe Tomography (APT) [2,3,[13][14][15][16][17]. Additionally, deterioration of the impact toughness by addition of Cu to the base steel or weld HAZ in accordance with tempering and PWTH has previously been shown [18][19][20]. However, research on the microstructural evolution and mechanical properties in the weld HAZ of HSLA steels with Cu has not fully explained the mechanism of impact toughness deterioration by Cu addition.…”

Section: Introductionmentioning

confidence: 99%

Variation of microstructures and mechanical properties in the post-weld heat-treated HAZ of Cu containing HSLA steel welds

et al. 2011

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The present study focuses on the effect of Cu and post-weld heat treatment (PWHT) on the microstructure and mechanical properties in the coarse grained heat affected zone (CGHAZ) of Cu containing high strength low alloy (HSLA) steel welds. For this study, HSLA steels with and without Cu were prepared in laboratory. Mechanical properties were estimated by Vickers hardness and Charpy impact tests. As a result, despite PWHT, the Vickers hardness did not change noticeably; however, the impact toughness deteriorated significantly with increasing PWHT time. In case of Cu added steel, intergranular brittle fractures occurred after PWHT, due to the strengthening of the grain interior by precipitation of Cu particles. Additionally, the formation of a soft denuded grain boundary zone also played a significant role in lowering the fracture toughness during PWHT.

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“…Thus, the precipitation sequence and structural transformations of Cu particles under various circumstances and their influence on mechanical responses and age hardenability of Cu-bearing steels have been extensively investigated. Multiple commercial Cu-bearing steels demonstrate improved mechanical properties such as tensile strength [7,8], fatigue strength [9], heat resistance [10]. Since Cu forms fine particles in steels by aging treatments, the strength of the steels are expected to be increased by particle dispersion strengthening.…”

Section: Introductionmentioning

confidence: 99%

Plastic deformation and dissolution of ε-Cu particles by cold rolling in an over-aged particle dispersion strengthening Fe-2mass%Cu alloy

et al. 2016

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Deformation and dissolution behaviors are important characteristics of soft dispersion particles in steel to improve the deformability of high strength steel sheets by controlling the work hardening/softening and fracture processes associated with particle dispersion strengthening. In this study, the deformation and dissolution behaviors of ε-Cu precipitate particles in a ferrite matrix were investigated to understand how relatively soft dispersion particles influence mechanical responses of the steel compared to hard dispersion particles such as alloy carbides. 35nm diameter nearly spherical ε-Cu particles were initially elongated along the rolling direction by cold rolling, and then these were partly dissolved into the ferrite matrix as the equivalent strain increased. The dissolution of the Cu particles was suggested to be caused by a dynamic partitioning of Cu atoms from the precipitates into the matrix by dislocation shearing at the particle tip sharpened by severe cold working. Simultaneously, the contribution of the ε-Cu particles to the dispersion strengthening appeared to be decreased with increasing dislocation density in the matrix during cold rolling. The dislocation density and other defects in the ε-Cu particles also increased and the particle/matrix interfaces were serrated or became indistinct as deformation progressed. The morphology, internal defects, and interface structure changes of fine dispersion particles and their correlation with mechanical responses of the alloy are discussed in reference to an identically processed, hard particles dispersed Fe-V binary alloy.

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Ageing behavior of a Cu-bearing ultrahigh strength steel

Cited by 33 publications

References 18 publications

Моделирование методом Монте-Карло кинетики распада и образования выделений на границах зерен общего типа в разбавленных ОЦК-сплавах Fe-Сu

Моделирование методом Монте-Карло кинетики распада и образования выделений на границах зерен общего типа в разбавленных ОЦК-сплавах Fe-Сu

Variation of microstructures and mechanical properties in the post-weld heat-treated HAZ of Cu containing HSLA steel welds

Plastic deformation and dissolution of ε-Cu particles by cold rolling in an over-aged particle dispersion strengthening Fe-2mass%Cu alloy

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