The role of cementite in the formation of magnetic hysteresis properties of plastically deformed high-carbon steels: I. Magnetic properties and structural state of cementite

Ulyanov, A.N.; Елсуков, Е. П.; Чулкина, А. А.; Zagainov, A. V.; Arsent'eva, N. B.; Коныгин, Г. Н.; Новиков, В. Л.; Исаков, В. В.

doi:10.1134/s1061830906070047

Cited by 18 publications

(6 citation statements)

References 3 publications

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“…samples containing Ann-Fe@CNTs display the highest M s (34 vs. 24 emu g −1 ) and the smallest coercivity (430 vs. 570 Oe) as a consequence of the high α-Fe/Fe 3 C ratio. 83 A moderate increase in the H c value was also observed for the HCl-washed samples (from 550 to 570 Oe for Fc-Fe@CNTs and HCl-Fe@CNTs, respectively), caused by the significant loss of the exohedral Fe nanoparticles and the presence of the anisotropic, and thus highly coercive, endohedral Fe nanorods. 71…”

Section: Synthesis and Physicochemical Characterization Of Fe@cntsmentioning

confidence: 79%

Biotechnological promises of Fe-filled CNTs for cell shepherding and magnetic fluid hyperthermia applications

et al. 2015

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Fe-filled carbon nanotubes (Fe@CNTs) recently emerged as an effective class of hybrid nanoparticles for biotechnological applications, such as magnetic cell sorting and magnetic fluid hyperthermia. Aiming at studying the effects of both the Fe loading and the magnetocrystalline characteristics in these applications, we describe herein the preparation of Fe@CNTs containing different Fe phases that, upon functionalization with the antibody Cetuximab (Ctxb), allow the targeting of cancer cells. Our experimental findings reveal that an optimal Ctxb/Fe weight ratio of 1.2 is needed for efficient magnetic cell shepherding, whereas enhanced MFH-induced mortality (70 vs. 15%) can be reached with hybrids enriched in the coercive Fe(3)C phase. These results suggest that a synergistic effect between the Ab loading and the Fe distribution in each nanotube exists, for which the maximum shepherding and hyperthermia effects are observed when higher densities of Fe@CNTs featuring the more coercive phase are interfaced with the cells.

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Section: Synthesis and Physicochemical Characterization Of Fe@cntsmentioning

confidence: 79%

Biotechnological promises of Fe-filled CNTs for cell shepherding and magnetic fluid hyperthermia applications

et al. 2015

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“…Focusing on pearlitic steel, References [ 18 , 27 , 28 , 29 ] describe the interplay of coercivity and plastic deformation. In [ 18 ], the changes of the magnetic properties of patented steels containing 0.24 and 0.70 wt.% C are discussed.…”

Section: Resultsmentioning

confidence: 99%

“…The decreasing coercivity is explained by a combination of volume reduction of cementite as well as rotation and fragmentation of cementite lamellae. These arguments are complemented by Ul’yanov et al who found a low coercivity state ( H c ~8000 A m −1 ) of cementite after strong deformation using ball milling [ 27 ].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 5 shows a comparison of the results from [ 18 ] together with a linear fit and the measurements described in this work. The trend in decreasing coercivity with increasing strain is clear and it is explained in [ 18 ] by volume reduction of the cementite, fragmentation and rotation of the remaining cementite lamellae in combination with a low-coercivity state of cementite after severe deformation [ 27 ]. The reasons for the small deviation of the linear extrapolation to the measured coercivity for 24- and 36-µm wires are manifold.…”

Section: Resultsmentioning

confidence: 99%

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Soft Magnetic Properties of Ultra-Strong and Nanocrystalline Pearlitic Wires

et al. 2021

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The paper describes the capability of magnetic softening of a coarse-grained bulk material by a severe deformation technique. Connecting the microstructure with magnetic properties, the coercive field decreases dramatically for grains smaller than the magnetic exchange length. This makes the investigation of soft magnetic properties of severely drawn pearlitic wires very interesting. With the help of the starting two-phase microstructure, it is possible to substantially refine the material, which allows the investigation of magnetic properties for nanocrystalline bulk material. Compared to the coarse-grained initial, pearlitic state, the coercivities of the highly deformed wires decrease while the saturation magnetization values increase—even beyond the value expectable from the individual constituents. The lowest coercivity in the drawn state is found to be 520 A m−1 for a wire of 24-µm thickness and an annealing treatment has a further positive effect on it. The decreasing coercivity is discussed in the framework of two opposing models: grain refinement on the one hand and dissolution of cementite on the other hand. Auxiliary measurements give a clear indication for the latter model, delivering a sufficient description of the observed evolution of magnetic properties.

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“…The magnetic hysteresis properties of cementite obtained by the mechanical sintering of iron and graphite powders were studied in [5]. In this work, it was found that the coercive force of cementite may be varied within wide limits from 80 to 240 A/cm depending on its structural state.…”

Section: Introductionmentioning

confidence: 99%

The effect of cementite on the formation of the magnetic hysteresis properties of thermally treated carbon steels

Zagainov

Ulyanov

Чулкина

et al. 2012

Russ J Nondestruct Test

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The role of cementite in the mechanisms of formation of the coercive force of high purity 60 and 13 model steels and 9A and 12A industrial steels after quenching and subsequent medium and high temperature tempering is determined from the analysis of the temperature dependences of the coercive force. It is shown that cementite as a hard magnetic phase plays an important part in the formation of the dependence H c (T temp ) measured at room temperature. The maximum contribution caused by the coercivity of cementite to H c of the model steels is proportional to the volume content of cementite. In the industrial steels, an effect on the coercivity of cementite is produced by carbide forming unavoidable impurities.

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The role of cementite in the formation of magnetic hysteresis properties of plastically deformed high-carbon steels: I. Magnetic properties and structural state of cementite

Cited by 18 publications

References 3 publications

Biotechnological promises of Fe-filled CNTs for cell shepherding and magnetic fluid hyperthermia applications

Biotechnological promises of Fe-filled CNTs for cell shepherding and magnetic fluid hyperthermia applications

Soft Magnetic Properties of Ultra-Strong and Nanocrystalline Pearlitic Wires

The effect of cementite on the formation of the magnetic hysteresis properties of thermally treated carbon steels

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